One authors tests developing perfecting speed controller electric motors workbench 05 motor half-throttle scope trace shows wave form between MOSFET tab battery ground Controller operates better 95% efficiency Weve heard said some RC fliers havent given electric power try because havent wanted just on-off control motortheyve wanted play power just like throttle glow engines too great loss power know way around PC board should able build high-efficiency speed controller U Joe Utasi WHILE BACK bought Kraft Chip munk greatly reduced price impulse assumed low price tag couldnt possibly include motor Id have put trusty TD 049 surprise Chipmunk arrived 05 electric motor prop ready go Being somewhat purist decided just have proportional control throttle asked around checked out elec tric motor speed controllers already market found bit expensive side bulky heavy less 90% efficient After few test flights knew sure last 10% power really meant lot climb-out perform ance weight motor battery pack must already contended fliers total weight must kept minimum maximum flight performance good idea exactly what wantedhigh efficiency low weight smooth throttle response easy construc tion combined requirements own personal design philosophy less best came up design desribed article Its snap build hard parts find power MOS FETs Its worth effort con sider performance offer Circuit operation As can see 42 Model Aviation schematic theres really much circuit throttle input receiver comes through RI inverted Al R2 same time side C4 pulled ground A3 pin Al goes low allows C2 begin charging up through R3 R4 end throttle pulse voltage C2 sampled closing gate A4 dumping charge C2 C3 though tiny bit charge transferred time process happens over over frame rate radio systemusually 40 60 times second What end up DC voltage C3 proportional pulse width wider pulse higher voltage As throttle pulse completed falling edge allows pin II A3 rise rapidly causing positive pulse turn QI instant Since Cl delays A2 discharging C2 same time QI s pulse makes A4 turn briefly dump charge C2 C3 works both ways up down Resistors R8 R9 bias op amp B2 one-half supply voltage RIO provides feedback pin 3 causing reference voltage point move up down depending way pin sitting high low pin 1 goes high pin 3 moves up little bit Before output can go low again pin 2 must go above volt age pin 3 C5 charged up through RI 1 until occurs situation reversed called op-amp oscillator waveform pin 2 pretty much triangle used reference op-amp B simple comparator AT PINT Figure 1 Take look Figure 1 DC level RED Printed Circuit Pattern Bottom View 2X Size 1Parts Placement DiagramPOWER MOSFET DEVICES SIGNAL GROUND pin 5 moves up pulse width pin 7 gets wider moves down gets narrower extremes its simply off Take straightedge see yourself MOTOR BATTERY happens graph speed PACK varied wider pulse faster motor will run MOTOR MOTOR MOTOR BATTERY GND ERY g 10 Ni-cds power break circuit path sert 100-ohm resistor DloJ rtional Electronic1N5400 ON MOTOR Speed Control Schematic 03 13 AlA210470471 47K_Cl1047 RiS 22K BLK _C6 1001 B2047 SYSTEM GROUND MOTOR BATTERY GROUND June 1983 43 cFThG1fl14 R703 R413 RLJ e2 o02 o o m ZZI luAu Left Parts assembly sequence shown five pictures Begin jumper resistors shown Top Right transistors come next sure get placed proper orientation wont work too well theyre backwards Above Left Now capacitors Use stable temperature coefficient best results over long term Above Right Almost finished Add two integrated circuits 27K resistor next trimpot Left Last go three MOSFET devices Note project slightly beyond edge board wont cause heat sink short ground trace surrounding board oscillator runs about 8 9 kHz seems just right Since pushing op-amp limit its per formance Q2 straightens up edges pulse before fed Q3 Q3 isolates motor supply speed control supply allows maximum voltage drive applied power MOSFETs keep turned hard Zl strictly pro tection against voltage transients could destroy MOSFETs gates MOSFETs should handled care until soldered circuit Make sure well grounded handling types avail able Ive listed tried order feel should re spect performance Unless ef ficiency fanatic almost device list will give better performance ever dreamed possible Make & Model Internatl Rect IRF 541 Signetics IRF 541 RCA TA9288A Motorola MTP25NO5 Siemens BUZ 10 RCA TA9287A Signetics IRF 543 RdsThree Combined 085028 085028 085028 1 033 1 033 1 033 11 037 top three list range price $10 $15 rest fall $8 $10 range Right about now engineers will thinking Theres enough drive voltage FET gates thought too first testing revealed gain satu ration' MOSFETs almost un measurable gate voltage creased above 6 V Sticking KISS principle keep simple stupid decided forego extra complexity added components voltage up-converter Since maximum power loss type speed control occurs full throttle amount power wasted prod uct voltage across MOSFETs current going through Voltage simply current drain times Rds 05 motor current drain about 10 amps voltage across MOSFETs 10 X Rds case Siemens parts 33 44 Model Aviation MOTOR MOTOR CHARGE BATTERY PACK volts fully-charged six-cell pack 6 x 14 olts represents 4% power loss isnt enough knock socks off consider next paragraph throttle anything less wide open motor getting voltage pulses current lags voltage LI zzUL DPDTGND SWITCH Typical Wiring Hookup means current builds up slowly motor winding current less maximum loss across MOS FETs made smaller yet ef ficiency gets better half throttle can get five times flying time order protect MOSFETs inductive kick end pulse motor 3-amp greater 50-volt diode placed directly across motor terminals shown photo operate speed control having diode place Without diode voltage spikes high 60 volts occur MOSFETs switch off could cause fail mention electrical noise would create radio system Since MOSFETs dissipate max imum three four watts heat small aluminum plate 030 060 thick 2 4 can flush-mounted bottom fuselage behind motor location puts prop wash out sun three MOSFETs can bolted popriveted directly aluminum since tabs common Since theres little vi bration electrics leads MOSFETs adequate support small circuit board inside fuselage might want use little foam around insur ance though Construction Put MOSFETs last Dont forget jumper under 4066 chip rest doesnt matter what order choose sure make good hot solder joints use rosin-core solder Clean off Continued page 137 June 1983 45 finished pieces ready assembly Author drilled hole PC board heat sink adjust trimpot Card-stock used insulation between PC board heat sink diode must protection proper operation speed control Consider diode flight insurance Although MOSFETs can handle incredible amount power sensitive until soldered circuit Treat care iuseiage surrace optimum test purposes ausnor uaeg u-snaped piece aluminum bigger better uuII anger neipeg joe usual field testing human engineeringfor oe expresses thanks beauties electric assist RC Sailpianes elimination need hi-stafl CATCH ONE. IFYOUCAN tries Inc Equitable Life Assurance Soci ety US Exxon Corporation Federated Department Stores inc Field Enterprises Inc Firemans Fund Insurance Company FreeportMcMoRan Inc Gannett Foundation Gary Energy Corp/Samuel Gary Oil Producers/The Piton Foundation Gen Red Inc Gilman Paper Company BF Goodrich Inc Graphic Controls Corpora tion Gulf & Western Industries Inc Gulf Oil Corporation Harsco Corporation Har ford Steam Boiler Inspection & Insurance Co HJ Heinz Company Houston Natural Gas Corporation IBM Corporation Illinois Tool Works Inc International Minerals Chem ical Corporation U International Corpora tion Johnson & Higgins Johnson & Johnson Kansas City Southern Industries Inc Kear ney & Trecker Foundation Kemper Group Kennametal Inc Kimberly-Clark Corpora tion Kirkland & Ellis Koppers Company Lear Siegier Inc Lever Brothers Little Brown Company Los Angeles Times Company Marmon Group Inc Martin Mari etta Corporation McCormick & Co Inc McDonalds Corporation McGraw Hill Inc Mite Corporation Merit Gasoline Foundation Mobile Oil Company Monsanto Fund Mor gan Guaranty Trust Company New York Morton-Norwich Products Inc Murphy Oil Corporation Mutual BenefIt Life NCR Cor poration New England Telephone Northern Trust Company Norton Company Penzoil Company Petro-Lewis Corporation Pfizer Inc Phelps Dodge Foundation Philip Morris Inc Playboy Enterprises Inc Pogo Producing Company Post-Newsweek Sta tions Inc Power Technologies Inc PPG dustries Inc PQ Corporation Quaker Chemi cal Corporation Quaker Oats Company Rexnard Inc RJ Reynolds Industries Inc Santa Fe Industries Inc Joseph E Seagram & Sons Inc Security Pacific Corporation Signal Companies Inc St Paul Compan ies Inc Standard Oil Company Suizer Brothers Inc Tandy Corporation Texas Eastern Corporation Texas Instruments Inc Textron Inc Time Incorporated Times Mirror Co TransAmerica Corporation Travelers Insurance Company TRW Inc sSUPERMANTIS American R/C REAL MOVER. monkey around anything else can have best Thousands have thrilled excitement Mantis Supermantis provide very latest technology %coupled proven design gets air and keeps flying In-house manu facturing & quick delivery American made parts accessories means wont waiting promised overseas shipments process orders promptly efficiently. courtesyl Supermantis Get Hands On Supermantis 00 Mantis 00 Collective Pitch Mod 0 Prices sub jeci chonge notice 6 American R/C HelicopiersInc 619 744-7533 635-11 North Twin Oaks Valley Road San Marcos CA 92069 Union Pacific Corporation United Bank Denver United Parcel Service United States Fidelity & Guaranty Co United Technologies Corporation United Virginia Bankshares Inc Upjohn Company Washington Post Company Xerox Corporation Yarway Corporation Vince Mankowski Assistant AMA Executive Director Speed Controller/Utasi Continued page 45 board acetone lacquer thinner youre finished Remember clean off heat sink diode motor too Adjustment After youve wired whole thing shown charged batteries make sure motor fastened down solid Turn radio motor power Adjust trimpot R4 transmitter stick trim full high speed just stops Increasing speed control pul sing will hear high-pitched whistle Increase speed turning R4 until whistle just stops proper setting radio Throttle back motor should slow down Pull stick way back along trim motor should stop doesnt pulse width variation radio probably less 8 milliseconds stop stop Just change RIO 240K 270K should take care problem Send $4 Main Plan Additional Information U U sure have controller screwed heat sink before use though its very efficient does require way dis sipate some heat Comments speed control selfprotecting motor battery runs down MOSFET drive decreased As Ni Cds reach discharged state MOS FETs will turn thus saving bat teries damage Also throttle stick back motor off reverse voltage generated free-wheeling prop will applied Ni-Cds Parts List Resistors RI R2 R12 R13 R1447K R327K R450K Piher trimpot R5 10K R6 R7 RI ilOOK R8 R9220K RI 52 2K Miscellaneous PC Board wire solder heat sink Transistors Q Q22N3904 Q32N3906 Integrated Circuits Al -A4---CD4066 BI B2LM358Continued page 140 June 1983 137 Offered Two Sizes Kborits nu Plan Drawings S Partial Kits Quarter Scale Kioritz type Engine 94 Span Oaarter Scale Plan Set $3000 6 Sheets Opposite Wing View $1200 2 Sheets 2 Scale Plan Set $150012 Sheetsl Opposite Wino View add $77h 2 Scale 60 Engtnes 63 Span 980 Sq 50 tar Fiesigns needKits ot noar bailding Dealer inquiries invited connecting rods made bent materials available designed give long service eliminate rod breakage modern highPerfor mance model engines Used leading aircraft boat car racers hobbyists Rods available popular model engines Look RPM new innovative products proven performance records Richardson Precision Machining Inc 5070 Golden Or. San Jose CA 9512914081257-7059 Capacitors CI C2 C3 C6AVX 047 uf 50-volt CK7 tempco C4 C5AVX 001 uf 50-volt MOSFETs Siemens BUZ 10 equivalent 60-volt 20-amp Rds m finished speed control including MOSFETs available $49 An sembled board less MOSFETs available $29 Bare printed circuit board etched drilled solder reflowed $750 Con tact Jomar Products 2028 Knightsbridge Dr Cincinnati OH 45244 Congratulate/Kinning Continued page 47 until sky thins out number planes feel comfortable fly heavy air traffic remain control yourself well airplane dont get angry al have midair dont say illmannered things other fliers lousy flier doesnt have fun certainly tries does loops snap rolls around through trafficand pulls up sharply narrowly averts head-on because hes flying against pattern Sometimes nar rowly misses tail section someones pride joy seems could care less because hes having ball Worst gets angry verbally loses temper people cant about crowded situation can Landing times comes finish flight ready have looked see field clear have sig nalled let other fliers know intentions announcing loud voice Landing have looked see air space clear no other airplanes will interfere set up final approach cut throttle slow airplane grease another right front contrast poor flier will best overtake final approachor hell make tight circle landing pattern impeding traffic behind him sweep down fast-idle hard landing half way down field flier must watch him closely doesnt believe verbal signals has problem Nu advance planning mind wondering whats lunch whether buddies watching wild maneuvers Congratulations ordinary flying might say basic stuff instructor taught before soloed Theres nothing very remarkable about Besides bad-flier cases cited hypothetical could never happen real world RC Perhaps youre right Arent glad nobody flies like bad flier club bottom line next time youre flying field someone does something annoy congratulate self being better average enjoy able hobby both complex de manding fully realize irresponsible behavior reckless flying can tolerated Safety factor everyone connected model aviation concerned mustnt rest pat yourself back certainly flying keep both hands transmitter Continue think about what doing time start engine Get completely absorbed task flying airplane Plan moves execute smoothly noth ing surprise around have experience get through flight hand experience con siderable asset Congratulate yourself Youve earned RC Aerobatics/Van Putte Continued page 49 called Deveon White Two Ton Epoxy Un fortunately does seem available through normal hobby distributors least ones does business Hes sending sample try out works well claims Ill try find Out purchase put information column Right now Im working new 40-size powered Supertigre 60 sport airplane started about 12 years ago fiber glass fuselage purchased Royal Products about 1970 ought well cured now 140 Model Aviation D EE High perform engine connoc /%%1731 NW 45 Street Ft Lauderdale FL 33309 1395l 491-6115 ENGINEERING THE LANUING GEAR PEOPLE 1irsd hil landing gears dsnl lii year biggie prtperly II & II Enginoenig can seine four prsbleins * Cuattot haul four needs & specs gooratleelt Ia lit * Slrnog & durable Ia withstand toughest landing * 9 & 0 Engineering gear will warh & keep biggie hf log * In stack replaceniott lear 1st papolar models Byrun PitIs Christen EaIe CAP 21 Balsa USA J3 CUB Air Tech Powace Eagle lIsten Big Stick Champ Citulmna B & models Snapper Stinger Stopper Tat FOX 35 STUNT IN CONTINUOUS PRODUCTION FOR 34 YEARS Remember Control Line Simple Airplane atteries no servos requency problems lectric starters no tension way fly dont re-live yesteryears helping child young neighbor build fly Control Line Model Motor 35 Stunt course 34 years nobody has able improve ifs easy starting reliability list Line 15011 646-1656 Fox MFG Co 5305 TDWSON AVE FORT SMITH ARK 72901 AlTENTION ERS EPOXY GLASS COWLS FOR NOSEN PICA SIO MORGAN BALSA USA PIATT CONCEPT FLEET HOSTETLER RCM T-CRAFT SHEBER P171S iS & SCALE SUPER CUB POKKER 0-7 BOEING P- 12 P-26 F4B2 P4B4 SPARROW HAWK GEE BEE MOO r MACBRIENS TuRBULENT cHRISTEN EAGLE BRISIGHELLAS STARDUSTER II SCALE J3-BI BABY FLYBABY AIRCAMPER PILOT JUNGMANS t35 SCALE t/4 SCALE DECATHALON PIPER PAtB ft OTHERS WHEEL PANTS FOR CITABRIA STAROUSTER II PIUS SKYBOLT LINER TI SPORT CHRISTEN EAGLE PB E HAWK STEARMAN STINSON SR-S MULLIGAN ft OTHERS BRAZED & HEAT-TREATED WIRE GEARS& CABANES LARGE SCALE PLANS AVAILABLE Send SASE latest list supply Modelers fiberglass parts plansWrite call us T Et D FIBERGLASS SPECIALTIES 30925 eLOCK GARDEN CITY Ml 40136 PHONE 313 421-6358
Edition: Model Aviation - 1983/06
Page Numbers: 42, 43, 44, 45, 137, 140
Edition: Model Aviation - 1983/06
Page Numbers: 42, 43, 44, 45, 137, 140
One authors tests developing perfecting speed controller electric motors workbench 05 motor half-throttle scope trace shows wave form between MOSFET tab battery ground Controller operates better 95% efficiency Weve heard said some RC fliers havent given electric power try because havent wanted just on-off control motortheyve wanted play power just like throttle glow engines too great loss power know way around PC board should able build high-efficiency speed controller U Joe Utasi WHILE BACK bought Kraft Chip munk greatly reduced price impulse assumed low price tag couldnt possibly include motor Id have put trusty TD 049 surprise Chipmunk arrived 05 electric motor prop ready go Being somewhat purist decided just have proportional control throttle asked around checked out elec tric motor speed controllers already market found bit expensive side bulky heavy less 90% efficient After few test flights knew sure last 10% power really meant lot climb-out perform ance weight motor battery pack must already contended fliers total weight must kept minimum maximum flight performance good idea exactly what wantedhigh efficiency low weight smooth throttle response easy construc tion combined requirements own personal design philosophy less best came up design desribed article Its snap build hard parts find power MOS FETs Its worth effort con sider performance offer Circuit operation As can see 42 Model Aviation schematic theres really much circuit throttle input receiver comes through RI inverted Al R2 same time side C4 pulled ground A3 pin Al goes low allows C2 begin charging up through R3 R4 end throttle pulse voltage C2 sampled closing gate A4 dumping charge C2 C3 though tiny bit charge transferred time process happens over over frame rate radio systemusually 40 60 times second What end up DC voltage C3 proportional pulse width wider pulse higher voltage As throttle pulse completed falling edge allows pin II A3 rise rapidly causing positive pulse turn QI instant Since Cl delays A2 discharging C2 same time QI s pulse makes A4 turn briefly dump charge C2 C3 works both ways up down Resistors R8 R9 bias op amp B2 one-half supply voltage RIO provides feedback pin 3 causing reference voltage point move up down depending way pin sitting high low pin 1 goes high pin 3 moves up little bit Before output can go low again pin 2 must go above volt age pin 3 C5 charged up through RI 1 until occurs situation reversed called op-amp oscillator waveform pin 2 pretty much triangle used reference op-amp B simple comparator AT PINT Figure 1 Take look Figure 1 DC level RED Printed Circuit Pattern Bottom View 2X Size 1Parts Placement DiagramPOWER MOSFET DEVICES SIGNAL GROUND pin 5 moves up pulse width pin 7 gets wider moves down gets narrower extremes its simply off Take straightedge see yourself MOTOR BATTERY happens graph speed PACK varied wider pulse faster motor will run MOTOR MOTOR MOTOR BATTERY GND ERY g 10 Ni-cds power break circuit path sert 100-ohm resistor DloJ rtional Electronic1N5400 ON MOTOR Speed Control Schematic 03 13 AlA210470471 47K_Cl1047 RiS 22K BLK _C6 1001 B2047 SYSTEM GROUND MOTOR BATTERY GROUND June 1983 43 cFThG1fl14 R703 R413 RLJ e2 o02 o o m ZZI luAu Left Parts assembly sequence shown five pictures Begin jumper resistors shown Top Right transistors come next sure get placed proper orientation wont work too well theyre backwards Above Left Now capacitors Use stable temperature coefficient best results over long term Above Right Almost finished Add two integrated circuits 27K resistor next trimpot Left Last go three MOSFET devices Note project slightly beyond edge board wont cause heat sink short ground trace surrounding board oscillator runs about 8 9 kHz seems just right Since pushing op-amp limit its per formance Q2 straightens up edges pulse before fed Q3 Q3 isolates motor supply speed control supply allows maximum voltage drive applied power MOSFETs keep turned hard Zl strictly pro tection against voltage transients could destroy MOSFETs gates MOSFETs should handled care until soldered circuit Make sure well grounded handling types avail able Ive listed tried order feel should re spect performance Unless ef ficiency fanatic almost device list will give better performance ever dreamed possible Make & Model Internatl Rect IRF 541 Signetics IRF 541 RCA TA9288A Motorola MTP25NO5 Siemens BUZ 10 RCA TA9287A Signetics IRF 543 RdsThree Combined 085028 085028 085028 1 033 1 033 1 033 11 037 top three list range price $10 $15 rest fall $8 $10 range Right about now engineers will thinking Theres enough drive voltage FET gates thought too first testing revealed gain satu ration' MOSFETs almost un measurable gate voltage creased above 6 V Sticking KISS principle keep simple stupid decided forego extra complexity added components voltage up-converter Since maximum power loss type speed control occurs full throttle amount power wasted prod uct voltage across MOSFETs current going through Voltage simply current drain times Rds 05 motor current drain about 10 amps voltage across MOSFETs 10 X Rds case Siemens parts 33 44 Model Aviation MOTOR MOTOR CHARGE BATTERY PACK volts fully-charged six-cell pack 6 x 14 olts represents 4% power loss isnt enough knock socks off consider next paragraph throttle anything less wide open motor getting voltage pulses current lags voltage LI zzUL DPDTGND SWITCH Typical Wiring Hookup means current builds up slowly motor winding current less maximum loss across MOS FETs made smaller yet ef ficiency gets better half throttle can get five times flying time order protect MOSFETs inductive kick end pulse motor 3-amp greater 50-volt diode placed directly across motor terminals shown photo operate speed control having diode place Without diode voltage spikes high 60 volts occur MOSFETs switch off could cause fail mention electrical noise would create radio system Since MOSFETs dissipate max imum three four watts heat small aluminum plate 030 060 thick 2 4 can flush-mounted bottom fuselage behind motor location puts prop wash out sun three MOSFETs can bolted popriveted directly aluminum since tabs common Since theres little vi bration electrics leads MOSFETs adequate support small circuit board inside fuselage might want use little foam around insur ance though Construction Put MOSFETs last Dont forget jumper under 4066 chip rest doesnt matter what order choose sure make good hot solder joints use rosin-core solder Clean off Continued page 137 June 1983 45 finished pieces ready assembly Author drilled hole PC board heat sink adjust trimpot Card-stock used insulation between PC board heat sink diode must protection proper operation speed control Consider diode flight insurance Although MOSFETs can handle incredible amount power sensitive until soldered circuit Treat care iuseiage surrace optimum test purposes ausnor uaeg u-snaped piece aluminum bigger better uuII anger neipeg joe usual field testing human engineeringfor oe expresses thanks beauties electric assist RC Sailpianes elimination need hi-stafl CATCH ONE. IFYOUCAN tries Inc Equitable Life Assurance Soci ety US Exxon Corporation Federated Department Stores inc Field Enterprises Inc Firemans Fund Insurance Company FreeportMcMoRan Inc Gannett Foundation Gary Energy Corp/Samuel Gary Oil Producers/The Piton Foundation Gen Red Inc Gilman Paper Company BF Goodrich Inc Graphic Controls Corpora tion Gulf & Western Industries Inc Gulf Oil Corporation Harsco Corporation Har ford Steam Boiler Inspection & Insurance Co HJ Heinz Company Houston Natural Gas Corporation IBM Corporation Illinois Tool Works Inc International Minerals Chem ical Corporation U International Corpora tion Johnson & Higgins Johnson & Johnson Kansas City Southern Industries Inc Kear ney & Trecker Foundation Kemper Group Kennametal Inc Kimberly-Clark Corpora tion Kirkland & Ellis Koppers Company Lear Siegier Inc Lever Brothers Little Brown Company Los Angeles Times Company Marmon Group Inc Martin Mari etta Corporation McCormick & Co Inc McDonalds Corporation McGraw Hill Inc Mite Corporation Merit Gasoline Foundation Mobile Oil Company Monsanto Fund Mor gan Guaranty Trust Company New York Morton-Norwich Products Inc Murphy Oil Corporation Mutual BenefIt Life NCR Cor poration New England Telephone Northern Trust Company Norton Company Penzoil Company Petro-Lewis Corporation Pfizer Inc Phelps Dodge Foundation Philip Morris Inc Playboy Enterprises Inc Pogo Producing Company Post-Newsweek Sta tions Inc Power Technologies Inc PPG dustries Inc PQ Corporation Quaker Chemi cal Corporation Quaker Oats Company Rexnard Inc RJ Reynolds Industries Inc Santa Fe Industries Inc Joseph E Seagram & Sons Inc Security Pacific Corporation Signal Companies Inc St Paul Compan ies Inc Standard Oil Company Suizer Brothers Inc Tandy Corporation Texas Eastern Corporation Texas Instruments Inc Textron Inc Time Incorporated Times Mirror Co TransAmerica Corporation Travelers Insurance Company TRW Inc sSUPERMANTIS American R/C REAL MOVER. monkey around anything else can have best Thousands have thrilled excitement Mantis Supermantis provide very latest technology %coupled proven design gets air and keeps flying In-house manu facturing & quick delivery American made parts accessories means wont waiting promised overseas shipments process orders promptly efficiently. courtesyl Supermantis Get Hands On Supermantis 00 Mantis 00 Collective Pitch Mod 0 Prices sub jeci chonge notice 6 American R/C HelicopiersInc 619 744-7533 635-11 North Twin Oaks Valley Road San Marcos CA 92069 Union Pacific Corporation United Bank Denver United Parcel Service United States Fidelity & Guaranty Co United Technologies Corporation United Virginia Bankshares Inc Upjohn Company Washington Post Company Xerox Corporation Yarway Corporation Vince Mankowski Assistant AMA Executive Director Speed Controller/Utasi Continued page 45 board acetone lacquer thinner youre finished Remember clean off heat sink diode motor too Adjustment After youve wired whole thing shown charged batteries make sure motor fastened down solid Turn radio motor power Adjust trimpot R4 transmitter stick trim full high speed just stops Increasing speed control pul sing will hear high-pitched whistle Increase speed turning R4 until whistle just stops proper setting radio Throttle back motor should slow down Pull stick way back along trim motor should stop doesnt pulse width variation radio probably less 8 milliseconds stop stop Just change RIO 240K 270K should take care problem Send $4 Main Plan Additional Information U U sure have controller screwed heat sink before use though its very efficient does require way dis sipate some heat Comments speed control selfprotecting motor battery runs down MOSFET drive decreased As Ni Cds reach discharged state MOS FETs will turn thus saving bat teries damage Also throttle stick back motor off reverse voltage generated free-wheeling prop will applied Ni-Cds Parts List Resistors RI R2 R12 R13 R1447K R327K R450K Piher trimpot R5 10K R6 R7 RI ilOOK R8 R9220K RI 52 2K Miscellaneous PC Board wire solder heat sink Transistors Q Q22N3904 Q32N3906 Integrated Circuits Al -A4---CD4066 BI B2LM358Continued page 140 June 1983 137 Offered Two Sizes Kborits nu Plan Drawings S Partial Kits Quarter Scale Kioritz type Engine 94 Span Oaarter Scale Plan Set $3000 6 Sheets Opposite Wing View $1200 2 Sheets 2 Scale Plan Set $150012 Sheetsl Opposite Wino View add $77h 2 Scale 60 Engtnes 63 Span 980 Sq 50 tar Fiesigns needKits ot noar bailding Dealer inquiries invited connecting rods made bent materials available designed give long service eliminate rod breakage modern highPerfor mance model engines Used leading aircraft boat car racers hobbyists Rods available popular model engines Look RPM new innovative products proven performance records Richardson Precision Machining Inc 5070 Golden Or. San Jose CA 9512914081257-7059 Capacitors CI C2 C3 C6AVX 047 uf 50-volt CK7 tempco C4 C5AVX 001 uf 50-volt MOSFETs Siemens BUZ 10 equivalent 60-volt 20-amp Rds m finished speed control including MOSFETs available $49 An sembled board less MOSFETs available $29 Bare printed circuit board etched drilled solder reflowed $750 Con tact Jomar Products 2028 Knightsbridge Dr Cincinnati OH 45244 Congratulate/Kinning Continued page 47 until sky thins out number planes feel comfortable fly heavy air traffic remain control yourself well airplane dont get angry al have midair dont say illmannered things other fliers lousy flier doesnt have fun certainly tries does loops snap rolls around through trafficand pulls up sharply narrowly averts head-on because hes flying against pattern Sometimes nar rowly misses tail section someones pride joy seems could care less because hes having ball Worst gets angry verbally loses temper people cant about crowded situation can Landing times comes finish flight ready have looked see field clear have sig nalled let other fliers know intentions announcing loud voice Landing have looked see air space clear no other airplanes will interfere set up final approach cut throttle slow airplane grease another right front contrast poor flier will best overtake final approachor hell make tight circle landing pattern impeding traffic behind him sweep down fast-idle hard landing half way down field flier must watch him closely doesnt believe verbal signals has problem Nu advance planning mind wondering whats lunch whether buddies watching wild maneuvers Congratulations ordinary flying might say basic stuff instructor taught before soloed Theres nothing very remarkable about Besides bad-flier cases cited hypothetical could never happen real world RC Perhaps youre right Arent glad nobody flies like bad flier club bottom line next time youre flying field someone does something annoy congratulate self being better average enjoy able hobby both complex de manding fully realize irresponsible behavior reckless flying can tolerated Safety factor everyone connected model aviation concerned mustnt rest pat yourself back certainly flying keep both hands transmitter Continue think about what doing time start engine Get completely absorbed task flying airplane Plan moves execute smoothly noth ing surprise around have experience get through flight hand experience con siderable asset Congratulate yourself Youve earned RC Aerobatics/Van Putte Continued page 49 called Deveon White Two Ton Epoxy Un fortunately does seem available through normal hobby distributors least ones does business Hes sending sample try out works well claims Ill try find Out purchase put information column Right now Im working new 40-size powered Supertigre 60 sport airplane started about 12 years ago fiber glass fuselage purchased Royal Products about 1970 ought well cured now 140 Model Aviation D EE High perform engine connoc /%%1731 NW 45 Street Ft Lauderdale FL 33309 1395l 491-6115 ENGINEERING THE LANUING GEAR PEOPLE 1irsd hil landing gears dsnl lii year biggie prtperly II & II Enginoenig can seine four prsbleins * Cuattot haul four needs & specs gooratleelt Ia lit * Slrnog & durable Ia withstand toughest landing * 9 & 0 Engineering gear will warh & keep biggie hf log * In stack replaceniott lear 1st papolar models Byrun PitIs Christen EaIe CAP 21 Balsa USA J3 CUB Air Tech Powace Eagle lIsten Big Stick Champ Citulmna B & models Snapper Stinger Stopper Tat FOX 35 STUNT IN CONTINUOUS PRODUCTION FOR 34 YEARS Remember Control Line Simple Airplane atteries no servos requency problems lectric starters no tension way fly dont re-live yesteryears helping child young neighbor build fly Control Line Model Motor 35 Stunt course 34 years nobody has able improve ifs easy starting reliability list Line 15011 646-1656 Fox MFG Co 5305 TDWSON AVE FORT SMITH ARK 72901 AlTENTION ERS EPOXY GLASS COWLS FOR NOSEN PICA SIO MORGAN BALSA USA PIATT CONCEPT FLEET HOSTETLER RCM T-CRAFT SHEBER P171S iS & SCALE SUPER CUB POKKER 0-7 BOEING P- 12 P-26 F4B2 P4B4 SPARROW HAWK GEE BEE MOO r MACBRIENS TuRBULENT cHRISTEN EAGLE BRISIGHELLAS STARDUSTER II SCALE J3-BI BABY FLYBABY AIRCAMPER PILOT JUNGMANS t35 SCALE t/4 SCALE DECATHALON PIPER PAtB ft OTHERS WHEEL PANTS FOR CITABRIA STAROUSTER II PIUS SKYBOLT LINER TI SPORT CHRISTEN EAGLE PB E HAWK STEARMAN STINSON SR-S MULLIGAN ft OTHERS BRAZED & HEAT-TREATED WIRE GEARS& CABANES LARGE SCALE PLANS AVAILABLE Send SASE latest list supply Modelers fiberglass parts plansWrite call us T Et D FIBERGLASS SPECIALTIES 30925 eLOCK GARDEN CITY Ml 40136 PHONE 313 421-6358
Edition: Model Aviation - 1983/06
Page Numbers: 42, 43, 44, 45, 137, 140
One authors tests developing perfecting speed controller electric motors workbench 05 motor half-throttle scope trace shows wave form between MOSFET tab battery ground Controller operates better 95% efficiency Weve heard said some RC fliers havent given electric power try because havent wanted just on-off control motortheyve wanted play power just like throttle glow engines too great loss power know way around PC board should able build high-efficiency speed controller U Joe Utasi WHILE BACK bought Kraft Chip munk greatly reduced price impulse assumed low price tag couldnt possibly include motor Id have put trusty TD 049 surprise Chipmunk arrived 05 electric motor prop ready go Being somewhat purist decided just have proportional control throttle asked around checked out elec tric motor speed controllers already market found bit expensive side bulky heavy less 90% efficient After few test flights knew sure last 10% power really meant lot climb-out perform ance weight motor battery pack must already contended fliers total weight must kept minimum maximum flight performance good idea exactly what wantedhigh efficiency low weight smooth throttle response easy construc tion combined requirements own personal design philosophy less best came up design desribed article Its snap build hard parts find power MOS FETs Its worth effort con sider performance offer Circuit operation As can see 42 Model Aviation schematic theres really much circuit throttle input receiver comes through RI inverted Al R2 same time side C4 pulled ground A3 pin Al goes low allows C2 begin charging up through R3 R4 end throttle pulse voltage C2 sampled closing gate A4 dumping charge C2 C3 though tiny bit charge transferred time process happens over over frame rate radio systemusually 40 60 times second What end up DC voltage C3 proportional pulse width wider pulse higher voltage As throttle pulse completed falling edge allows pin II A3 rise rapidly causing positive pulse turn QI instant Since Cl delays A2 discharging C2 same time QI s pulse makes A4 turn briefly dump charge C2 C3 works both ways up down Resistors R8 R9 bias op amp B2 one-half supply voltage RIO provides feedback pin 3 causing reference voltage point move up down depending way pin sitting high low pin 1 goes high pin 3 moves up little bit Before output can go low again pin 2 must go above volt age pin 3 C5 charged up through RI 1 until occurs situation reversed called op-amp oscillator waveform pin 2 pretty much triangle used reference op-amp B simple comparator AT PINT Figure 1 Take look Figure 1 DC level RED Printed Circuit Pattern Bottom View 2X Size 1Parts Placement DiagramPOWER MOSFET DEVICES SIGNAL GROUND pin 5 moves up pulse width pin 7 gets wider moves down gets narrower extremes its simply off Take straightedge see yourself MOTOR BATTERY happens graph speed PACK varied wider pulse faster motor will run MOTOR MOTOR MOTOR BATTERY GND ERY g 10 Ni-cds power break circuit path sert 100-ohm resistor DloJ rtional Electronic1N5400 ON MOTOR Speed Control Schematic 03 13 AlA210470471 47K_Cl1047 RiS 22K BLK _C6 1001 B2047 SYSTEM GROUND MOTOR BATTERY GROUND June 1983 43 cFThG1fl14 R703 R413 RLJ e2 o02 o o m ZZI luAu Left Parts assembly sequence shown five pictures Begin jumper resistors shown Top Right transistors come next sure get placed proper orientation wont work too well theyre backwards Above Left Now capacitors Use stable temperature coefficient best results over long term Above Right Almost finished Add two integrated circuits 27K resistor next trimpot Left Last go three MOSFET devices Note project slightly beyond edge board wont cause heat sink short ground trace surrounding board oscillator runs about 8 9 kHz seems just right Since pushing op-amp limit its per formance Q2 straightens up edges pulse before fed Q3 Q3 isolates motor supply speed control supply allows maximum voltage drive applied power MOSFETs keep turned hard Zl strictly pro tection against voltage transients could destroy MOSFETs gates MOSFETs should handled care until soldered circuit Make sure well grounded handling types avail able Ive listed tried order feel should re spect performance Unless ef ficiency fanatic almost device list will give better performance ever dreamed possible Make & Model Internatl Rect IRF 541 Signetics IRF 541 RCA TA9288A Motorola MTP25NO5 Siemens BUZ 10 RCA TA9287A Signetics IRF 543 RdsThree Combined 085028 085028 085028 1 033 1 033 1 033 11 037 top three list range price $10 $15 rest fall $8 $10 range Right about now engineers will thinking Theres enough drive voltage FET gates thought too first testing revealed gain satu ration' MOSFETs almost un measurable gate voltage creased above 6 V Sticking KISS principle keep simple stupid decided forego extra complexity added components voltage up-converter Since maximum power loss type speed control occurs full throttle amount power wasted prod uct voltage across MOSFETs current going through Voltage simply current drain times Rds 05 motor current drain about 10 amps voltage across MOSFETs 10 X Rds case Siemens parts 33 44 Model Aviation MOTOR MOTOR CHARGE BATTERY PACK volts fully-charged six-cell pack 6 x 14 olts represents 4% power loss isnt enough knock socks off consider next paragraph throttle anything less wide open motor getting voltage pulses current lags voltage LI zzUL DPDTGND SWITCH Typical Wiring Hookup means current builds up slowly motor winding current less maximum loss across MOS FETs made smaller yet ef ficiency gets better half throttle can get five times flying time order protect MOSFETs inductive kick end pulse motor 3-amp greater 50-volt diode placed directly across motor terminals shown photo operate speed control having diode place Without diode voltage spikes high 60 volts occur MOSFETs switch off could cause fail mention electrical noise would create radio system Since MOSFETs dissipate max imum three four watts heat small aluminum plate 030 060 thick 2 4 can flush-mounted bottom fuselage behind motor location puts prop wash out sun three MOSFETs can bolted popriveted directly aluminum since tabs common Since theres little vi bration electrics leads MOSFETs adequate support small circuit board inside fuselage might want use little foam around insur ance though Construction Put MOSFETs last Dont forget jumper under 4066 chip rest doesnt matter what order choose sure make good hot solder joints use rosin-core solder Clean off Continued page 137 June 1983 45 finished pieces ready assembly Author drilled hole PC board heat sink adjust trimpot Card-stock used insulation between PC board heat sink diode must protection proper operation speed control Consider diode flight insurance Although MOSFETs can handle incredible amount power sensitive until soldered circuit Treat care iuseiage surrace optimum test purposes ausnor uaeg u-snaped piece aluminum bigger better uuII anger neipeg joe usual field testing human engineeringfor oe expresses thanks beauties electric assist RC Sailpianes elimination need hi-stafl CATCH ONE. IFYOUCAN tries Inc Equitable Life Assurance Soci ety US Exxon Corporation Federated Department Stores inc Field Enterprises Inc Firemans Fund Insurance Company FreeportMcMoRan Inc Gannett Foundation Gary Energy Corp/Samuel Gary Oil Producers/The Piton Foundation Gen Red Inc Gilman Paper Company BF Goodrich Inc Graphic Controls Corpora tion Gulf & Western Industries Inc Gulf Oil Corporation Harsco Corporation Har ford Steam Boiler Inspection & Insurance Co HJ Heinz Company Houston Natural Gas Corporation IBM Corporation Illinois Tool Works Inc International Minerals Chem ical Corporation U International Corpora tion Johnson & Higgins Johnson & Johnson Kansas City Southern Industries Inc Kear ney & Trecker Foundation Kemper Group Kennametal Inc Kimberly-Clark Corpora tion Kirkland & Ellis Koppers Company Lear Siegier Inc Lever Brothers Little Brown Company Los Angeles Times Company Marmon Group Inc Martin Mari etta Corporation McCormick & Co Inc McDonalds Corporation McGraw Hill Inc Mite Corporation Merit Gasoline Foundation Mobile Oil Company Monsanto Fund Mor gan Guaranty Trust Company New York Morton-Norwich Products Inc Murphy Oil Corporation Mutual BenefIt Life NCR Cor poration New England Telephone Northern Trust Company Norton Company Penzoil Company Petro-Lewis Corporation Pfizer Inc Phelps Dodge Foundation Philip Morris Inc Playboy Enterprises Inc Pogo Producing Company Post-Newsweek Sta tions Inc Power Technologies Inc PPG dustries Inc PQ Corporation Quaker Chemi cal Corporation Quaker Oats Company Rexnard Inc RJ Reynolds Industries Inc Santa Fe Industries Inc Joseph E Seagram & Sons Inc Security Pacific Corporation Signal Companies Inc St Paul Compan ies Inc Standard Oil Company Suizer Brothers Inc Tandy Corporation Texas Eastern Corporation Texas Instruments Inc Textron Inc Time Incorporated Times Mirror Co TransAmerica Corporation Travelers Insurance Company TRW Inc sSUPERMANTIS American R/C REAL MOVER. monkey around anything else can have best Thousands have thrilled excitement Mantis Supermantis provide very latest technology %coupled proven design gets air and keeps flying In-house manu facturing & quick delivery American made parts accessories means wont waiting promised overseas shipments process orders promptly efficiently. courtesyl Supermantis Get Hands On Supermantis 00 Mantis 00 Collective Pitch Mod 0 Prices sub jeci chonge notice 6 American R/C HelicopiersInc 619 744-7533 635-11 North Twin Oaks Valley Road San Marcos CA 92069 Union Pacific Corporation United Bank Denver United Parcel Service United States Fidelity & Guaranty Co United Technologies Corporation United Virginia Bankshares Inc Upjohn Company Washington Post Company Xerox Corporation Yarway Corporation Vince Mankowski Assistant AMA Executive Director Speed Controller/Utasi Continued page 45 board acetone lacquer thinner youre finished Remember clean off heat sink diode motor too Adjustment After youve wired whole thing shown charged batteries make sure motor fastened down solid Turn radio motor power Adjust trimpot R4 transmitter stick trim full high speed just stops Increasing speed control pul sing will hear high-pitched whistle Increase speed turning R4 until whistle just stops proper setting radio Throttle back motor should slow down Pull stick way back along trim motor should stop doesnt pulse width variation radio probably less 8 milliseconds stop stop Just change RIO 240K 270K should take care problem Send $4 Main Plan Additional Information U U sure have controller screwed heat sink before use though its very efficient does require way dis sipate some heat Comments speed control selfprotecting motor battery runs down MOSFET drive decreased As Ni Cds reach discharged state MOS FETs will turn thus saving bat teries damage Also throttle stick back motor off reverse voltage generated free-wheeling prop will applied Ni-Cds Parts List Resistors RI R2 R12 R13 R1447K R327K R450K Piher trimpot R5 10K R6 R7 RI ilOOK R8 R9220K RI 52 2K Miscellaneous PC Board wire solder heat sink Transistors Q Q22N3904 Q32N3906 Integrated Circuits Al -A4---CD4066 BI B2LM358Continued page 140 June 1983 137 Offered Two Sizes Kborits nu Plan Drawings S Partial Kits Quarter Scale Kioritz type Engine 94 Span Oaarter Scale Plan Set $3000 6 Sheets Opposite Wing View $1200 2 Sheets 2 Scale Plan Set $150012 Sheetsl Opposite Wino View add $77h 2 Scale 60 Engtnes 63 Span 980 Sq 50 tar Fiesigns needKits ot noar bailding Dealer inquiries invited connecting rods made bent materials available designed give long service eliminate rod breakage modern highPerfor mance model engines Used leading aircraft boat car racers hobbyists Rods available popular model engines Look RPM new innovative products proven performance records Richardson Precision Machining Inc 5070 Golden Or. San Jose CA 9512914081257-7059 Capacitors CI C2 C3 C6AVX 047 uf 50-volt CK7 tempco C4 C5AVX 001 uf 50-volt MOSFETs Siemens BUZ 10 equivalent 60-volt 20-amp Rds m finished speed control including MOSFETs available $49 An sembled board less MOSFETs available $29 Bare printed circuit board etched drilled solder reflowed $750 Con tact Jomar Products 2028 Knightsbridge Dr Cincinnati OH 45244 Congratulate/Kinning Continued page 47 until sky thins out number planes feel comfortable fly heavy air traffic remain control yourself well airplane dont get angry al have midair dont say illmannered things other fliers lousy flier doesnt have fun certainly tries does loops snap rolls around through trafficand pulls up sharply narrowly averts head-on because hes flying against pattern Sometimes nar rowly misses tail section someones pride joy seems could care less because hes having ball Worst gets angry verbally loses temper people cant about crowded situation can Landing times comes finish flight ready have looked see field clear have sig nalled let other fliers know intentions announcing loud voice Landing have looked see air space clear no other airplanes will interfere set up final approach cut throttle slow airplane grease another right front contrast poor flier will best overtake final approachor hell make tight circle landing pattern impeding traffic behind him sweep down fast-idle hard landing half way down field flier must watch him closely doesnt believe verbal signals has problem Nu advance planning mind wondering whats lunch whether buddies watching wild maneuvers Congratulations ordinary flying might say basic stuff instructor taught before soloed Theres nothing very remarkable about Besides bad-flier cases cited hypothetical could never happen real world RC Perhaps youre right Arent glad nobody flies like bad flier club bottom line next time youre flying field someone does something annoy congratulate self being better average enjoy able hobby both complex de manding fully realize irresponsible behavior reckless flying can tolerated Safety factor everyone connected model aviation concerned mustnt rest pat yourself back certainly flying keep both hands transmitter Continue think about what doing time start engine Get completely absorbed task flying airplane Plan moves execute smoothly noth ing surprise around have experience get through flight hand experience con siderable asset Congratulate yourself Youve earned RC Aerobatics/Van Putte Continued page 49 called Deveon White Two Ton Epoxy Un fortunately does seem available through normal hobby distributors least ones does business Hes sending sample try out works well claims Ill try find Out purchase put information column Right now Im working new 40-size powered Supertigre 60 sport airplane started about 12 years ago fiber glass fuselage purchased Royal Products about 1970 ought well cured now 140 Model Aviation D EE High perform engine connoc /%%1731 NW 45 Street Ft Lauderdale FL 33309 1395l 491-6115 ENGINEERING THE LANUING GEAR PEOPLE 1irsd hil landing gears dsnl lii year biggie prtperly II & II Enginoenig can seine four prsbleins * Cuattot haul four needs & specs gooratleelt Ia lit * Slrnog & durable Ia withstand toughest landing * 9 & 0 Engineering gear will warh & keep biggie hf log * In stack replaceniott lear 1st papolar models Byrun PitIs Christen EaIe CAP 21 Balsa USA J3 CUB Air Tech Powace Eagle lIsten Big Stick Champ Citulmna B & models Snapper Stinger Stopper Tat FOX 35 STUNT IN CONTINUOUS PRODUCTION FOR 34 YEARS Remember Control Line Simple Airplane atteries no servos requency problems lectric starters no tension way fly dont re-live yesteryears helping child young neighbor build fly Control Line Model Motor 35 Stunt course 34 years nobody has able improve ifs easy starting reliability list Line 15011 646-1656 Fox MFG Co 5305 TDWSON AVE FORT SMITH ARK 72901 AlTENTION ERS EPOXY GLASS COWLS FOR NOSEN PICA SIO MORGAN BALSA USA PIATT CONCEPT FLEET HOSTETLER RCM T-CRAFT SHEBER P171S iS & SCALE SUPER CUB POKKER 0-7 BOEING P- 12 P-26 F4B2 P4B4 SPARROW HAWK GEE BEE MOO r MACBRIENS TuRBULENT cHRISTEN EAGLE BRISIGHELLAS STARDUSTER II SCALE J3-BI BABY FLYBABY AIRCAMPER PILOT JUNGMANS t35 SCALE t/4 SCALE DECATHALON PIPER PAtB ft OTHERS WHEEL PANTS FOR CITABRIA STAROUSTER II PIUS SKYBOLT LINER TI SPORT CHRISTEN EAGLE PB E HAWK STEARMAN STINSON SR-S MULLIGAN ft OTHERS BRAZED & HEAT-TREATED WIRE GEARS& CABANES LARGE SCALE PLANS AVAILABLE Send SASE latest list supply Modelers fiberglass parts plansWrite call us T Et D FIBERGLASS SPECIALTIES 30925 eLOCK GARDEN CITY Ml 40136 PHONE 313 421-6358
Edition: Model Aviation - 1983/06
Page Numbers: 42, 43, 44, 45, 137, 140
One authors tests developing perfecting speed controller electric motors workbench 05 motor half-throttle scope trace shows wave form between MOSFET tab battery ground Controller operates better 95% efficiency Weve heard said some RC fliers havent given electric power try because havent wanted just on-off control motortheyve wanted play power just like throttle glow engines too great loss power know way around PC board should able build high-efficiency speed controller U Joe Utasi WHILE BACK bought Kraft Chip munk greatly reduced price impulse assumed low price tag couldnt possibly include motor Id have put trusty TD 049 surprise Chipmunk arrived 05 electric motor prop ready go Being somewhat purist decided just have proportional control throttle asked around checked out elec tric motor speed controllers already market found bit expensive side bulky heavy less 90% efficient After few test flights knew sure last 10% power really meant lot climb-out perform ance weight motor battery pack must already contended fliers total weight must kept minimum maximum flight performance good idea exactly what wantedhigh efficiency low weight smooth throttle response easy construc tion combined requirements own personal design philosophy less best came up design desribed article Its snap build hard parts find power MOS FETs Its worth effort con sider performance offer Circuit operation As can see 42 Model Aviation schematic theres really much circuit throttle input receiver comes through RI inverted Al R2 same time side C4 pulled ground A3 pin Al goes low allows C2 begin charging up through R3 R4 end throttle pulse voltage C2 sampled closing gate A4 dumping charge C2 C3 though tiny bit charge transferred time process happens over over frame rate radio systemusually 40 60 times second What end up DC voltage C3 proportional pulse width wider pulse higher voltage As throttle pulse completed falling edge allows pin II A3 rise rapidly causing positive pulse turn QI instant Since Cl delays A2 discharging C2 same time QI s pulse makes A4 turn briefly dump charge C2 C3 works both ways up down Resistors R8 R9 bias op amp B2 one-half supply voltage RIO provides feedback pin 3 causing reference voltage point move up down depending way pin sitting high low pin 1 goes high pin 3 moves up little bit Before output can go low again pin 2 must go above volt age pin 3 C5 charged up through RI 1 until occurs situation reversed called op-amp oscillator waveform pin 2 pretty much triangle used reference op-amp B simple comparator AT PINT Figure 1 Take look Figure 1 DC level RED Printed Circuit Pattern Bottom View 2X Size 1Parts Placement DiagramPOWER MOSFET DEVICES SIGNAL GROUND pin 5 moves up pulse width pin 7 gets wider moves down gets narrower extremes its simply off Take straightedge see yourself MOTOR BATTERY happens graph speed PACK varied wider pulse faster motor will run MOTOR MOTOR MOTOR BATTERY GND ERY g 10 Ni-cds power break circuit path sert 100-ohm resistor DloJ rtional Electronic1N5400 ON MOTOR Speed Control Schematic 03 13 AlA210470471 47K_Cl1047 RiS 22K BLK _C6 1001 B2047 SYSTEM GROUND MOTOR BATTERY GROUND June 1983 43 cFThG1fl14 R703 R413 RLJ e2 o02 o o m ZZI luAu Left Parts assembly sequence shown five pictures Begin jumper resistors shown Top Right transistors come next sure get placed proper orientation wont work too well theyre backwards Above Left Now capacitors Use stable temperature coefficient best results over long term Above Right Almost finished Add two integrated circuits 27K resistor next trimpot Left Last go three MOSFET devices Note project slightly beyond edge board wont cause heat sink short ground trace surrounding board oscillator runs about 8 9 kHz seems just right Since pushing op-amp limit its per formance Q2 straightens up edges pulse before fed Q3 Q3 isolates motor supply speed control supply allows maximum voltage drive applied power MOSFETs keep turned hard Zl strictly pro tection against voltage transients could destroy MOSFETs gates MOSFETs should handled care until soldered circuit Make sure well grounded handling types avail able Ive listed tried order feel should re spect performance Unless ef ficiency fanatic almost device list will give better performance ever dreamed possible Make & Model Internatl Rect IRF 541 Signetics IRF 541 RCA TA9288A Motorola MTP25NO5 Siemens BUZ 10 RCA TA9287A Signetics IRF 543 RdsThree Combined 085028 085028 085028 1 033 1 033 1 033 11 037 top three list range price $10 $15 rest fall $8 $10 range Right about now engineers will thinking Theres enough drive voltage FET gates thought too first testing revealed gain satu ration' MOSFETs almost un measurable gate voltage creased above 6 V Sticking KISS principle keep simple stupid decided forego extra complexity added components voltage up-converter Since maximum power loss type speed control occurs full throttle amount power wasted prod uct voltage across MOSFETs current going through Voltage simply current drain times Rds 05 motor current drain about 10 amps voltage across MOSFETs 10 X Rds case Siemens parts 33 44 Model Aviation MOTOR MOTOR CHARGE BATTERY PACK volts fully-charged six-cell pack 6 x 14 olts represents 4% power loss isnt enough knock socks off consider next paragraph throttle anything less wide open motor getting voltage pulses current lags voltage LI zzUL DPDTGND SWITCH Typical Wiring Hookup means current builds up slowly motor winding current less maximum loss across MOS FETs made smaller yet ef ficiency gets better half throttle can get five times flying time order protect MOSFETs inductive kick end pulse motor 3-amp greater 50-volt diode placed directly across motor terminals shown photo operate speed control having diode place Without diode voltage spikes high 60 volts occur MOSFETs switch off could cause fail mention electrical noise would create radio system Since MOSFETs dissipate max imum three four watts heat small aluminum plate 030 060 thick 2 4 can flush-mounted bottom fuselage behind motor location puts prop wash out sun three MOSFETs can bolted popriveted directly aluminum since tabs common Since theres little vi bration electrics leads MOSFETs adequate support small circuit board inside fuselage might want use little foam around insur ance though Construction Put MOSFETs last Dont forget jumper under 4066 chip rest doesnt matter what order choose sure make good hot solder joints use rosin-core solder Clean off Continued page 137 June 1983 45 finished pieces ready assembly Author drilled hole PC board heat sink adjust trimpot Card-stock used insulation between PC board heat sink diode must protection proper operation speed control Consider diode flight insurance Although MOSFETs can handle incredible amount power sensitive until soldered circuit Treat care iuseiage surrace optimum test purposes ausnor uaeg u-snaped piece aluminum bigger better uuII anger neipeg joe usual field testing human engineeringfor oe expresses thanks beauties electric assist RC Sailpianes elimination need hi-stafl CATCH ONE. IFYOUCAN tries Inc Equitable Life Assurance Soci ety US Exxon Corporation Federated Department Stores inc Field Enterprises Inc Firemans Fund Insurance Company FreeportMcMoRan Inc Gannett Foundation Gary Energy Corp/Samuel Gary Oil Producers/The Piton Foundation Gen Red Inc Gilman Paper Company BF Goodrich Inc Graphic Controls Corpora tion Gulf & Western Industries Inc Gulf Oil Corporation Harsco Corporation Har ford Steam Boiler Inspection & Insurance Co HJ Heinz Company Houston Natural Gas Corporation IBM Corporation Illinois Tool Works Inc International Minerals Chem ical Corporation U International Corpora tion Johnson & Higgins Johnson & Johnson Kansas City Southern Industries Inc Kear ney & Trecker Foundation Kemper Group Kennametal Inc Kimberly-Clark Corpora tion Kirkland & Ellis Koppers Company Lear Siegier Inc Lever Brothers Little Brown Company Los Angeles Times Company Marmon Group Inc Martin Mari etta Corporation McCormick & Co Inc McDonalds Corporation McGraw Hill Inc Mite Corporation Merit Gasoline Foundation Mobile Oil Company Monsanto Fund Mor gan Guaranty Trust Company New York Morton-Norwich Products Inc Murphy Oil Corporation Mutual BenefIt Life NCR Cor poration New England Telephone Northern Trust Company Norton Company Penzoil Company Petro-Lewis Corporation Pfizer Inc Phelps Dodge Foundation Philip Morris Inc Playboy Enterprises Inc Pogo Producing Company Post-Newsweek Sta tions Inc Power Technologies Inc PPG dustries Inc PQ Corporation Quaker Chemi cal Corporation Quaker Oats Company Rexnard Inc RJ Reynolds Industries Inc Santa Fe Industries Inc Joseph E Seagram & Sons Inc Security Pacific Corporation Signal Companies Inc St Paul Compan ies Inc Standard Oil Company Suizer Brothers Inc Tandy Corporation Texas Eastern Corporation Texas Instruments Inc Textron Inc Time Incorporated Times Mirror Co TransAmerica Corporation Travelers Insurance Company TRW Inc sSUPERMANTIS American R/C REAL MOVER. monkey around anything else can have best Thousands have thrilled excitement Mantis Supermantis provide very latest technology %coupled proven design gets air and keeps flying In-house manu facturing & quick delivery American made parts accessories means wont waiting promised overseas shipments process orders promptly efficiently. courtesyl Supermantis Get Hands On Supermantis 00 Mantis 00 Collective Pitch Mod 0 Prices sub jeci chonge notice 6 American R/C HelicopiersInc 619 744-7533 635-11 North Twin Oaks Valley Road San Marcos CA 92069 Union Pacific Corporation United Bank Denver United Parcel Service United States Fidelity & Guaranty Co United Technologies Corporation United Virginia Bankshares Inc Upjohn Company Washington Post Company Xerox Corporation Yarway Corporation Vince Mankowski Assistant AMA Executive Director Speed Controller/Utasi Continued page 45 board acetone lacquer thinner youre finished Remember clean off heat sink diode motor too Adjustment After youve wired whole thing shown charged batteries make sure motor fastened down solid Turn radio motor power Adjust trimpot R4 transmitter stick trim full high speed just stops Increasing speed control pul sing will hear high-pitched whistle Increase speed turning R4 until whistle just stops proper setting radio Throttle back motor should slow down Pull stick way back along trim motor should stop doesnt pulse width variation radio probably less 8 milliseconds stop stop Just change RIO 240K 270K should take care problem Send $4 Main Plan Additional Information U U sure have controller screwed heat sink before use though its very efficient does require way dis sipate some heat Comments speed control selfprotecting motor battery runs down MOSFET drive decreased As Ni Cds reach discharged state MOS FETs will turn thus saving bat teries damage Also throttle stick back motor off reverse voltage generated free-wheeling prop will applied Ni-Cds Parts List Resistors RI R2 R12 R13 R1447K R327K R450K Piher trimpot R5 10K R6 R7 RI ilOOK R8 R9220K RI 52 2K Miscellaneous PC Board wire solder heat sink Transistors Q Q22N3904 Q32N3906 Integrated Circuits Al -A4---CD4066 BI B2LM358Continued page 140 June 1983 137 Offered Two Sizes Kborits nu Plan Drawings S Partial Kits Quarter Scale Kioritz type Engine 94 Span Oaarter Scale Plan Set $3000 6 Sheets Opposite Wing View $1200 2 Sheets 2 Scale Plan Set $150012 Sheetsl Opposite Wino View add $77h 2 Scale 60 Engtnes 63 Span 980 Sq 50 tar Fiesigns needKits ot noar bailding Dealer inquiries invited connecting rods made bent materials available designed give long service eliminate rod breakage modern highPerfor mance model engines Used leading aircraft boat car racers hobbyists Rods available popular model engines Look RPM new innovative products proven performance records Richardson Precision Machining Inc 5070 Golden Or. San Jose CA 9512914081257-7059 Capacitors CI C2 C3 C6AVX 047 uf 50-volt CK7 tempco C4 C5AVX 001 uf 50-volt MOSFETs Siemens BUZ 10 equivalent 60-volt 20-amp Rds m finished speed control including MOSFETs available $49 An sembled board less MOSFETs available $29 Bare printed circuit board etched drilled solder reflowed $750 Con tact Jomar Products 2028 Knightsbridge Dr Cincinnati OH 45244 Congratulate/Kinning Continued page 47 until sky thins out number planes feel comfortable fly heavy air traffic remain control yourself well airplane dont get angry al have midair dont say illmannered things other fliers lousy flier doesnt have fun certainly tries does loops snap rolls around through trafficand pulls up sharply narrowly averts head-on because hes flying against pattern Sometimes nar rowly misses tail section someones pride joy seems could care less because hes having ball Worst gets angry verbally loses temper people cant about crowded situation can Landing times comes finish flight ready have looked see field clear have sig nalled let other fliers know intentions announcing loud voice Landing have looked see air space clear no other airplanes will interfere set up final approach cut throttle slow airplane grease another right front contrast poor flier will best overtake final approachor hell make tight circle landing pattern impeding traffic behind him sweep down fast-idle hard landing half way down field flier must watch him closely doesnt believe verbal signals has problem Nu advance planning mind wondering whats lunch whether buddies watching wild maneuvers Congratulations ordinary flying might say basic stuff instructor taught before soloed Theres nothing very remarkable about Besides bad-flier cases cited hypothetical could never happen real world RC Perhaps youre right Arent glad nobody flies like bad flier club bottom line next time youre flying field someone does something annoy congratulate self being better average enjoy able hobby both complex de manding fully realize irresponsible behavior reckless flying can tolerated Safety factor everyone connected model aviation concerned mustnt rest pat yourself back certainly flying keep both hands transmitter Continue think about what doing time start engine Get completely absorbed task flying airplane Plan moves execute smoothly noth ing surprise around have experience get through flight hand experience con siderable asset Congratulate yourself Youve earned RC Aerobatics/Van Putte Continued page 49 called Deveon White Two Ton Epoxy Un fortunately does seem available through normal hobby distributors least ones does business Hes sending sample try out works well claims Ill try find Out purchase put information column Right now Im working new 40-size powered Supertigre 60 sport airplane started about 12 years ago fiber glass fuselage purchased Royal Products about 1970 ought well cured now 140 Model Aviation D EE High perform engine connoc /%%1731 NW 45 Street Ft Lauderdale FL 33309 1395l 491-6115 ENGINEERING THE LANUING GEAR PEOPLE 1irsd hil landing gears dsnl lii year biggie prtperly II & II Enginoenig can seine four prsbleins * Cuattot haul four needs & specs gooratleelt Ia lit * Slrnog & durable Ia withstand toughest landing * 9 & 0 Engineering gear will warh & keep biggie hf log * In stack replaceniott lear 1st papolar models Byrun PitIs Christen EaIe CAP 21 Balsa USA J3 CUB Air Tech Powace Eagle lIsten Big Stick Champ Citulmna B & models Snapper Stinger Stopper Tat FOX 35 STUNT IN CONTINUOUS PRODUCTION FOR 34 YEARS Remember Control Line Simple Airplane atteries no servos requency problems lectric starters no tension way fly dont re-live yesteryears helping child young neighbor build fly Control Line Model Motor 35 Stunt course 34 years nobody has able improve ifs easy starting reliability list Line 15011 646-1656 Fox MFG Co 5305 TDWSON AVE FORT SMITH ARK 72901 AlTENTION ERS EPOXY GLASS COWLS FOR NOSEN PICA SIO MORGAN BALSA USA PIATT CONCEPT FLEET HOSTETLER RCM T-CRAFT SHEBER P171S iS & SCALE SUPER CUB POKKER 0-7 BOEING P- 12 P-26 F4B2 P4B4 SPARROW HAWK GEE BEE MOO r MACBRIENS TuRBULENT cHRISTEN EAGLE BRISIGHELLAS STARDUSTER II SCALE J3-BI BABY FLYBABY AIRCAMPER PILOT JUNGMANS t35 SCALE t/4 SCALE DECATHALON PIPER PAtB ft OTHERS WHEEL PANTS FOR CITABRIA STAROUSTER II PIUS SKYBOLT LINER TI SPORT CHRISTEN EAGLE PB E HAWK STEARMAN STINSON SR-S MULLIGAN ft OTHERS BRAZED & HEAT-TREATED WIRE GEARS& CABANES LARGE SCALE PLANS AVAILABLE Send SASE latest list supply Modelers fiberglass parts plansWrite call us T Et D FIBERGLASS SPECIALTIES 30925 eLOCK GARDEN CITY Ml 40136 PHONE 313 421-6358
Edition: Model Aviation - 1983/06
Page Numbers: 42, 43, 44, 45, 137, 140
One authors tests developing perfecting speed controller electric motors workbench 05 motor half-throttle scope trace shows wave form between MOSFET tab battery ground Controller operates better 95% efficiency Weve heard said some RC fliers havent given electric power try because havent wanted just on-off control motortheyve wanted play power just like throttle glow engines too great loss power know way around PC board should able build high-efficiency speed controller U Joe Utasi WHILE BACK bought Kraft Chip munk greatly reduced price impulse assumed low price tag couldnt possibly include motor Id have put trusty TD 049 surprise Chipmunk arrived 05 electric motor prop ready go Being somewhat purist decided just have proportional control throttle asked around checked out elec tric motor speed controllers already market found bit expensive side bulky heavy less 90% efficient After few test flights knew sure last 10% power really meant lot climb-out perform ance weight motor battery pack must already contended fliers total weight must kept minimum maximum flight performance good idea exactly what wantedhigh efficiency low weight smooth throttle response easy construc tion combined requirements own personal design philosophy less best came up design desribed article Its snap build hard parts find power MOS FETs Its worth effort con sider performance offer Circuit operation As can see 42 Model Aviation schematic theres really much circuit throttle input receiver comes through RI inverted Al R2 same time side C4 pulled ground A3 pin Al goes low allows C2 begin charging up through R3 R4 end throttle pulse voltage C2 sampled closing gate A4 dumping charge C2 C3 though tiny bit charge transferred time process happens over over frame rate radio systemusually 40 60 times second What end up DC voltage C3 proportional pulse width wider pulse higher voltage As throttle pulse completed falling edge allows pin II A3 rise rapidly causing positive pulse turn QI instant Since Cl delays A2 discharging C2 same time QI s pulse makes A4 turn briefly dump charge C2 C3 works both ways up down Resistors R8 R9 bias op amp B2 one-half supply voltage RIO provides feedback pin 3 causing reference voltage point move up down depending way pin sitting high low pin 1 goes high pin 3 moves up little bit Before output can go low again pin 2 must go above volt age pin 3 C5 charged up through RI 1 until occurs situation reversed called op-amp oscillator waveform pin 2 pretty much triangle used reference op-amp B simple comparator AT PINT Figure 1 Take look Figure 1 DC level RED Printed Circuit Pattern Bottom View 2X Size 1Parts Placement DiagramPOWER MOSFET DEVICES SIGNAL GROUND pin 5 moves up pulse width pin 7 gets wider moves down gets narrower extremes its simply off Take straightedge see yourself MOTOR BATTERY happens graph speed PACK varied wider pulse faster motor will run MOTOR MOTOR MOTOR BATTERY GND ERY g 10 Ni-cds power break circuit path sert 100-ohm resistor DloJ rtional Electronic1N5400 ON MOTOR Speed Control Schematic 03 13 AlA210470471 47K_Cl1047 RiS 22K BLK _C6 1001 B2047 SYSTEM GROUND MOTOR BATTERY GROUND June 1983 43 cFThG1fl14 R703 R413 RLJ e2 o02 o o m ZZI luAu Left Parts assembly sequence shown five pictures Begin jumper resistors shown Top Right transistors come next sure get placed proper orientation wont work too well theyre backwards Above Left Now capacitors Use stable temperature coefficient best results over long term Above Right Almost finished Add two integrated circuits 27K resistor next trimpot Left Last go three MOSFET devices Note project slightly beyond edge board wont cause heat sink short ground trace surrounding board oscillator runs about 8 9 kHz seems just right Since pushing op-amp limit its per formance Q2 straightens up edges pulse before fed Q3 Q3 isolates motor supply speed control supply allows maximum voltage drive applied power MOSFETs keep turned hard Zl strictly pro tection against voltage transients could destroy MOSFETs gates MOSFETs should handled care until soldered circuit Make sure well grounded handling types avail able Ive listed tried order feel should re spect performance Unless ef ficiency fanatic almost device list will give better performance ever dreamed possible Make & Model Internatl Rect IRF 541 Signetics IRF 541 RCA TA9288A Motorola MTP25NO5 Siemens BUZ 10 RCA TA9287A Signetics IRF 543 RdsThree Combined 085028 085028 085028 1 033 1 033 1 033 11 037 top three list range price $10 $15 rest fall $8 $10 range Right about now engineers will thinking Theres enough drive voltage FET gates thought too first testing revealed gain satu ration' MOSFETs almost un measurable gate voltage creased above 6 V Sticking KISS principle keep simple stupid decided forego extra complexity added components voltage up-converter Since maximum power loss type speed control occurs full throttle amount power wasted prod uct voltage across MOSFETs current going through Voltage simply current drain times Rds 05 motor current drain about 10 amps voltage across MOSFETs 10 X Rds case Siemens parts 33 44 Model Aviation MOTOR MOTOR CHARGE BATTERY PACK volts fully-charged six-cell pack 6 x 14 olts represents 4% power loss isnt enough knock socks off consider next paragraph throttle anything less wide open motor getting voltage pulses current lags voltage LI zzUL DPDTGND SWITCH Typical Wiring Hookup means current builds up slowly motor winding current less maximum loss across MOS FETs made smaller yet ef ficiency gets better half throttle can get five times flying time order protect MOSFETs inductive kick end pulse motor 3-amp greater 50-volt diode placed directly across motor terminals shown photo operate speed control having diode place Without diode voltage spikes high 60 volts occur MOSFETs switch off could cause fail mention electrical noise would create radio system Since MOSFETs dissipate max imum three four watts heat small aluminum plate 030 060 thick 2 4 can flush-mounted bottom fuselage behind motor location puts prop wash out sun three MOSFETs can bolted popriveted directly aluminum since tabs common Since theres little vi bration electrics leads MOSFETs adequate support small circuit board inside fuselage might want use little foam around insur ance though Construction Put MOSFETs last Dont forget jumper under 4066 chip rest doesnt matter what order choose sure make good hot solder joints use rosin-core solder Clean off Continued page 137 June 1983 45 finished pieces ready assembly Author drilled hole PC board heat sink adjust trimpot Card-stock used insulation between PC board heat sink diode must protection proper operation speed control Consider diode flight insurance Although MOSFETs can handle incredible amount power sensitive until soldered circuit Treat care iuseiage surrace optimum test purposes ausnor uaeg u-snaped piece aluminum bigger better uuII anger neipeg joe usual field testing human engineeringfor oe expresses thanks beauties electric assist RC Sailpianes elimination need hi-stafl CATCH ONE. IFYOUCAN tries Inc Equitable Life Assurance Soci ety US Exxon Corporation Federated Department Stores inc Field Enterprises Inc Firemans Fund Insurance Company FreeportMcMoRan Inc Gannett Foundation Gary Energy Corp/Samuel Gary Oil Producers/The Piton Foundation Gen Red Inc Gilman Paper Company BF Goodrich Inc Graphic Controls Corpora tion Gulf & Western Industries Inc Gulf Oil Corporation Harsco Corporation Har ford Steam Boiler Inspection & Insurance Co HJ Heinz Company Houston Natural Gas Corporation IBM Corporation Illinois Tool Works Inc International Minerals Chem ical Corporation U International Corpora tion Johnson & Higgins Johnson & Johnson Kansas City Southern Industries Inc Kear ney & Trecker Foundation Kemper Group Kennametal Inc Kimberly-Clark Corpora tion Kirkland & Ellis Koppers Company Lear Siegier Inc Lever Brothers Little Brown Company Los Angeles Times Company Marmon Group Inc Martin Mari etta Corporation McCormick & Co Inc McDonalds Corporation McGraw Hill Inc Mite Corporation Merit Gasoline Foundation Mobile Oil Company Monsanto Fund Mor gan Guaranty Trust Company New York Morton-Norwich Products Inc Murphy Oil Corporation Mutual BenefIt Life NCR Cor poration New England Telephone Northern Trust Company Norton Company Penzoil Company Petro-Lewis Corporation Pfizer Inc Phelps Dodge Foundation Philip Morris Inc Playboy Enterprises Inc Pogo Producing Company Post-Newsweek Sta tions Inc Power Technologies Inc PPG dustries Inc PQ Corporation Quaker Chemi cal Corporation Quaker Oats Company Rexnard Inc RJ Reynolds Industries Inc Santa Fe Industries Inc Joseph E Seagram & Sons Inc Security Pacific Corporation Signal Companies Inc St Paul Compan ies Inc Standard Oil Company Suizer Brothers Inc Tandy Corporation Texas Eastern Corporation Texas Instruments Inc Textron Inc Time Incorporated Times Mirror Co TransAmerica Corporation Travelers Insurance Company TRW Inc sSUPERMANTIS American R/C REAL MOVER. monkey around anything else can have best Thousands have thrilled excitement Mantis Supermantis provide very latest technology %coupled proven design gets air and keeps flying In-house manu facturing & quick delivery American made parts accessories means wont waiting promised overseas shipments process orders promptly efficiently. courtesyl Supermantis Get Hands On Supermantis 00 Mantis 00 Collective Pitch Mod 0 Prices sub jeci chonge notice 6 American R/C HelicopiersInc 619 744-7533 635-11 North Twin Oaks Valley Road San Marcos CA 92069 Union Pacific Corporation United Bank Denver United Parcel Service United States Fidelity & Guaranty Co United Technologies Corporation United Virginia Bankshares Inc Upjohn Company Washington Post Company Xerox Corporation Yarway Corporation Vince Mankowski Assistant AMA Executive Director Speed Controller/Utasi Continued page 45 board acetone lacquer thinner youre finished Remember clean off heat sink diode motor too Adjustment After youve wired whole thing shown charged batteries make sure motor fastened down solid Turn radio motor power Adjust trimpot R4 transmitter stick trim full high speed just stops Increasing speed control pul sing will hear high-pitched whistle Increase speed turning R4 until whistle just stops proper setting radio Throttle back motor should slow down Pull stick way back along trim motor should stop doesnt pulse width variation radio probably less 8 milliseconds stop stop Just change RIO 240K 270K should take care problem Send $4 Main Plan Additional Information U U sure have controller screwed heat sink before use though its very efficient does require way dis sipate some heat Comments speed control selfprotecting motor battery runs down MOSFET drive decreased As Ni Cds reach discharged state MOS FETs will turn thus saving bat teries damage Also throttle stick back motor off reverse voltage generated free-wheeling prop will applied Ni-Cds Parts List Resistors RI R2 R12 R13 R1447K R327K R450K Piher trimpot R5 10K R6 R7 RI ilOOK R8 R9220K RI 52 2K Miscellaneous PC Board wire solder heat sink Transistors Q Q22N3904 Q32N3906 Integrated Circuits Al -A4---CD4066 BI B2LM358Continued page 140 June 1983 137 Offered Two Sizes Kborits nu Plan Drawings S Partial Kits Quarter Scale Kioritz type Engine 94 Span Oaarter Scale Plan Set $3000 6 Sheets Opposite Wing View $1200 2 Sheets 2 Scale Plan Set $150012 Sheetsl Opposite Wino View add $77h 2 Scale 60 Engtnes 63 Span 980 Sq 50 tar Fiesigns needKits ot noar bailding Dealer inquiries invited connecting rods made bent materials available designed give long service eliminate rod breakage modern highPerfor mance model engines Used leading aircraft boat car racers hobbyists Rods available popular model engines Look RPM new innovative products proven performance records Richardson Precision Machining Inc 5070 Golden Or. San Jose CA 9512914081257-7059 Capacitors CI C2 C3 C6AVX 047 uf 50-volt CK7 tempco C4 C5AVX 001 uf 50-volt MOSFETs Siemens BUZ 10 equivalent 60-volt 20-amp Rds m finished speed control including MOSFETs available $49 An sembled board less MOSFETs available $29 Bare printed circuit board etched drilled solder reflowed $750 Con tact Jomar Products 2028 Knightsbridge Dr Cincinnati OH 45244 Congratulate/Kinning Continued page 47 until sky thins out number planes feel comfortable fly heavy air traffic remain control yourself well airplane dont get angry al have midair dont say illmannered things other fliers lousy flier doesnt have fun certainly tries does loops snap rolls around through trafficand pulls up sharply narrowly averts head-on because hes flying against pattern Sometimes nar rowly misses tail section someones pride joy seems could care less because hes having ball Worst gets angry verbally loses temper people cant about crowded situation can Landing times comes finish flight ready have looked see field clear have sig nalled let other fliers know intentions announcing loud voice Landing have looked see air space clear no other airplanes will interfere set up final approach cut throttle slow airplane grease another right front contrast poor flier will best overtake final approachor hell make tight circle landing pattern impeding traffic behind him sweep down fast-idle hard landing half way down field flier must watch him closely doesnt believe verbal signals has problem Nu advance planning mind wondering whats lunch whether buddies watching wild maneuvers Congratulations ordinary flying might say basic stuff instructor taught before soloed Theres nothing very remarkable about Besides bad-flier cases cited hypothetical could never happen real world RC Perhaps youre right Arent glad nobody flies like bad flier club bottom line next time youre flying field someone does something annoy congratulate self being better average enjoy able hobby both complex de manding fully realize irresponsible behavior reckless flying can tolerated Safety factor everyone connected model aviation concerned mustnt rest pat yourself back certainly flying keep both hands transmitter Continue think about what doing time start engine Get completely absorbed task flying airplane Plan moves execute smoothly noth ing surprise around have experience get through flight hand experience con siderable asset Congratulate yourself Youve earned RC Aerobatics/Van Putte Continued page 49 called Deveon White Two Ton Epoxy Un fortunately does seem available through normal hobby distributors least ones does business Hes sending sample try out works well claims Ill try find Out purchase put information column Right now Im working new 40-size powered Supertigre 60 sport airplane started about 12 years ago fiber glass fuselage purchased Royal Products about 1970 ought well cured now 140 Model Aviation D EE High perform engine connoc /%%1731 NW 45 Street Ft Lauderdale FL 33309 1395l 491-6115 ENGINEERING THE LANUING GEAR PEOPLE 1irsd hil landing gears dsnl lii year biggie prtperly II & II Enginoenig can seine four prsbleins * Cuattot haul four needs & specs gooratleelt Ia lit * Slrnog & durable Ia withstand toughest landing * 9 & 0 Engineering gear will warh & keep biggie hf log * In stack replaceniott lear 1st papolar models Byrun PitIs Christen EaIe CAP 21 Balsa USA J3 CUB Air Tech Powace Eagle lIsten Big Stick Champ Citulmna B & models Snapper Stinger Stopper Tat FOX 35 STUNT IN CONTINUOUS PRODUCTION FOR 34 YEARS Remember Control Line Simple Airplane atteries no servos requency problems lectric starters no tension way fly dont re-live yesteryears helping child young neighbor build fly Control Line Model Motor 35 Stunt course 34 years nobody has able improve ifs easy starting reliability list Line 15011 646-1656 Fox MFG Co 5305 TDWSON AVE FORT SMITH ARK 72901 AlTENTION ERS EPOXY GLASS COWLS FOR NOSEN PICA SIO MORGAN BALSA USA PIATT CONCEPT FLEET HOSTETLER RCM T-CRAFT SHEBER P171S iS & SCALE SUPER CUB POKKER 0-7 BOEING P- 12 P-26 F4B2 P4B4 SPARROW HAWK GEE BEE MOO r MACBRIENS TuRBULENT cHRISTEN EAGLE BRISIGHELLAS STARDUSTER II SCALE J3-BI BABY FLYBABY AIRCAMPER PILOT JUNGMANS t35 SCALE t/4 SCALE DECATHALON PIPER PAtB ft OTHERS WHEEL PANTS FOR CITABRIA STAROUSTER II PIUS SKYBOLT LINER TI SPORT CHRISTEN EAGLE PB E HAWK STEARMAN STINSON SR-S MULLIGAN ft OTHERS BRAZED & HEAT-TREATED WIRE GEARS& CABANES LARGE SCALE PLANS AVAILABLE Send SASE latest list supply Modelers fiberglass parts plansWrite call us T Et D FIBERGLASS SPECIALTIES 30925 eLOCK GARDEN CITY Ml 40136 PHONE 313 421-6358
Edition: Model Aviation - 1983/06
Page Numbers: 42, 43, 44, 45, 137, 140
One authors tests developing perfecting speed controller electric motors workbench 05 motor half-throttle scope trace shows wave form between MOSFET tab battery ground Controller operates better 95% efficiency Weve heard said some RC fliers havent given electric power try because havent wanted just on-off control motortheyve wanted play power just like throttle glow engines too great loss power know way around PC board should able build high-efficiency speed controller U Joe Utasi WHILE BACK bought Kraft Chip munk greatly reduced price impulse assumed low price tag couldnt possibly include motor Id have put trusty TD 049 surprise Chipmunk arrived 05 electric motor prop ready go Being somewhat purist decided just have proportional control throttle asked around checked out elec tric motor speed controllers already market found bit expensive side bulky heavy less 90% efficient After few test flights knew sure last 10% power really meant lot climb-out perform ance weight motor battery pack must already contended fliers total weight must kept minimum maximum flight performance good idea exactly what wantedhigh efficiency low weight smooth throttle response easy construc tion combined requirements own personal design philosophy less best came up design desribed article Its snap build hard parts find power MOS FETs Its worth effort con sider performance offer Circuit operation As can see 42 Model Aviation schematic theres really much circuit throttle input receiver comes through RI inverted Al R2 same time side C4 pulled ground A3 pin Al goes low allows C2 begin charging up through R3 R4 end throttle pulse voltage C2 sampled closing gate A4 dumping charge C2 C3 though tiny bit charge transferred time process happens over over frame rate radio systemusually 40 60 times second What end up DC voltage C3 proportional pulse width wider pulse higher voltage As throttle pulse completed falling edge allows pin II A3 rise rapidly causing positive pulse turn QI instant Since Cl delays A2 discharging C2 same time QI s pulse makes A4 turn briefly dump charge C2 C3 works both ways up down Resistors R8 R9 bias op amp B2 one-half supply voltage RIO provides feedback pin 3 causing reference voltage point move up down depending way pin sitting high low pin 1 goes high pin 3 moves up little bit Before output can go low again pin 2 must go above volt age pin 3 C5 charged up through RI 1 until occurs situation reversed called op-amp oscillator waveform pin 2 pretty much triangle used reference op-amp B simple comparator AT PINT Figure 1 Take look Figure 1 DC level RED Printed Circuit Pattern Bottom View 2X Size 1Parts Placement DiagramPOWER MOSFET DEVICES SIGNAL GROUND pin 5 moves up pulse width pin 7 gets wider moves down gets narrower extremes its simply off Take straightedge see yourself MOTOR BATTERY happens graph speed PACK varied wider pulse faster motor will run MOTOR MOTOR MOTOR BATTERY GND ERY g 10 Ni-cds power break circuit path sert 100-ohm resistor DloJ rtional Electronic1N5400 ON MOTOR Speed Control Schematic 03 13 AlA210470471 47K_Cl1047 RiS 22K BLK _C6 1001 B2047 SYSTEM GROUND MOTOR BATTERY GROUND June 1983 43 cFThG1fl14 R703 R413 RLJ e2 o02 o o m ZZI luAu Left Parts assembly sequence shown five pictures Begin jumper resistors shown Top Right transistors come next sure get placed proper orientation wont work too well theyre backwards Above Left Now capacitors Use stable temperature coefficient best results over long term Above Right Almost finished Add two integrated circuits 27K resistor next trimpot Left Last go three MOSFET devices Note project slightly beyond edge board wont cause heat sink short ground trace surrounding board oscillator runs about 8 9 kHz seems just right Since pushing op-amp limit its per formance Q2 straightens up edges pulse before fed Q3 Q3 isolates motor supply speed control supply allows maximum voltage drive applied power MOSFETs keep turned hard Zl strictly pro tection against voltage transients could destroy MOSFETs gates MOSFETs should handled care until soldered circuit Make sure well grounded handling types avail able Ive listed tried order feel should re spect performance Unless ef ficiency fanatic almost device list will give better performance ever dreamed possible Make & Model Internatl Rect IRF 541 Signetics IRF 541 RCA TA9288A Motorola MTP25NO5 Siemens BUZ 10 RCA TA9287A Signetics IRF 543 RdsThree Combined 085028 085028 085028 1 033 1 033 1 033 11 037 top three list range price $10 $15 rest fall $8 $10 range Right about now engineers will thinking Theres enough drive voltage FET gates thought too first testing revealed gain satu ration' MOSFETs almost un measurable gate voltage creased above 6 V Sticking KISS principle keep simple stupid decided forego extra complexity added components voltage up-converter Since maximum power loss type speed control occurs full throttle amount power wasted prod uct voltage across MOSFETs current going through Voltage simply current drain times Rds 05 motor current drain about 10 amps voltage across MOSFETs 10 X Rds case Siemens parts 33 44 Model Aviation MOTOR MOTOR CHARGE BATTERY PACK volts fully-charged six-cell pack 6 x 14 olts represents 4% power loss isnt enough knock socks off consider next paragraph throttle anything less wide open motor getting voltage pulses current lags voltage LI zzUL DPDTGND SWITCH Typical Wiring Hookup means current builds up slowly motor winding current less maximum loss across MOS FETs made smaller yet ef ficiency gets better half throttle can get five times flying time order protect MOSFETs inductive kick end pulse motor 3-amp greater 50-volt diode placed directly across motor terminals shown photo operate speed control having diode place Without diode voltage spikes high 60 volts occur MOSFETs switch off could cause fail mention electrical noise would create radio system Since MOSFETs dissipate max imum three four watts heat small aluminum plate 030 060 thick 2 4 can flush-mounted bottom fuselage behind motor location puts prop wash out sun three MOSFETs can bolted popriveted directly aluminum since tabs common Since theres little vi bration electrics leads MOSFETs adequate support small circuit board inside fuselage might want use little foam around insur ance though Construction Put MOSFETs last Dont forget jumper under 4066 chip rest doesnt matter what order choose sure make good hot solder joints use rosin-core solder Clean off Continued page 137 June 1983 45 finished pieces ready assembly Author drilled hole PC board heat sink adjust trimpot Card-stock used insulation between PC board heat sink diode must protection proper operation speed control Consider diode flight insurance Although MOSFETs can handle incredible amount power sensitive until soldered circuit Treat care iuseiage surrace optimum test purposes ausnor uaeg u-snaped piece aluminum bigger better uuII anger neipeg joe usual field testing human engineeringfor oe expresses thanks beauties electric assist RC Sailpianes elimination need hi-stafl CATCH ONE. IFYOUCAN tries Inc Equitable Life Assurance Soci ety US Exxon Corporation Federated Department Stores inc Field Enterprises Inc Firemans Fund Insurance Company FreeportMcMoRan Inc Gannett Foundation Gary Energy Corp/Samuel Gary Oil Producers/The Piton Foundation Gen Red Inc Gilman Paper Company BF Goodrich Inc Graphic Controls Corpora tion Gulf & Western Industries Inc Gulf Oil Corporation Harsco Corporation Har ford Steam Boiler Inspection & Insurance Co HJ Heinz Company Houston Natural Gas Corporation IBM Corporation Illinois Tool Works Inc International Minerals Chem ical Corporation U International Corpora tion Johnson & Higgins Johnson & Johnson Kansas City Southern Industries Inc Kear ney & Trecker Foundation Kemper Group Kennametal Inc Kimberly-Clark Corpora tion Kirkland & Ellis Koppers Company Lear Siegier Inc Lever Brothers Little Brown Company Los Angeles Times Company Marmon Group Inc Martin Mari etta Corporation McCormick & Co Inc McDonalds Corporation McGraw Hill Inc Mite Corporation Merit Gasoline Foundation Mobile Oil Company Monsanto Fund Mor gan Guaranty Trust Company New York Morton-Norwich Products Inc Murphy Oil Corporation Mutual BenefIt Life NCR Cor poration New England Telephone Northern Trust Company Norton Company Penzoil Company Petro-Lewis Corporation Pfizer Inc Phelps Dodge Foundation Philip Morris Inc Playboy Enterprises Inc Pogo Producing Company Post-Newsweek Sta tions Inc Power Technologies Inc PPG dustries Inc PQ Corporation Quaker Chemi cal Corporation Quaker Oats Company Rexnard Inc RJ Reynolds Industries Inc Santa Fe Industries Inc Joseph E Seagram & Sons Inc Security Pacific Corporation Signal Companies Inc St Paul Compan ies Inc Standard Oil Company Suizer Brothers Inc Tandy Corporation Texas Eastern Corporation Texas Instruments Inc Textron Inc Time Incorporated Times Mirror Co TransAmerica Corporation Travelers Insurance Company TRW Inc sSUPERMANTIS American R/C REAL MOVER. monkey around anything else can have best Thousands have thrilled excitement Mantis Supermantis provide very latest technology %coupled proven design gets air and keeps flying In-house manu facturing & quick delivery American made parts accessories means wont waiting promised overseas shipments process orders promptly efficiently. courtesyl Supermantis Get Hands On Supermantis 00 Mantis 00 Collective Pitch Mod 0 Prices sub jeci chonge notice 6 American R/C HelicopiersInc 619 744-7533 635-11 North Twin Oaks Valley Road San Marcos CA 92069 Union Pacific Corporation United Bank Denver United Parcel Service United States Fidelity & Guaranty Co United Technologies Corporation United Virginia Bankshares Inc Upjohn Company Washington Post Company Xerox Corporation Yarway Corporation Vince Mankowski Assistant AMA Executive Director Speed Controller/Utasi Continued page 45 board acetone lacquer thinner youre finished Remember clean off heat sink diode motor too Adjustment After youve wired whole thing shown charged batteries make sure motor fastened down solid Turn radio motor power Adjust trimpot R4 transmitter stick trim full high speed just stops Increasing speed control pul sing will hear high-pitched whistle Increase speed turning R4 until whistle just stops proper setting radio Throttle back motor should slow down Pull stick way back along trim motor should stop doesnt pulse width variation radio probably less 8 milliseconds stop stop Just change RIO 240K 270K should take care problem Send $4 Main Plan Additional Information U U sure have controller screwed heat sink before use though its very efficient does require way dis sipate some heat Comments speed control selfprotecting motor battery runs down MOSFET drive decreased As Ni Cds reach discharged state MOS FETs will turn thus saving bat teries damage Also throttle stick back motor off reverse voltage generated free-wheeling prop will applied Ni-Cds Parts List Resistors RI R2 R12 R13 R1447K R327K R450K Piher trimpot R5 10K R6 R7 RI ilOOK R8 R9220K RI 52 2K Miscellaneous PC Board wire solder heat sink Transistors Q Q22N3904 Q32N3906 Integrated Circuits Al -A4---CD4066 BI B2LM358Continued page 140 June 1983 137 Offered Two Sizes Kborits nu Plan Drawings S Partial Kits Quarter Scale Kioritz type Engine 94 Span Oaarter Scale Plan Set $3000 6 Sheets Opposite Wing View $1200 2 Sheets 2 Scale Plan Set $150012 Sheetsl Opposite Wino View add $77h 2 Scale 60 Engtnes 63 Span 980 Sq 50 tar Fiesigns needKits ot noar bailding Dealer inquiries invited connecting rods made bent materials available designed give long service eliminate rod breakage modern highPerfor mance model engines Used leading aircraft boat car racers hobbyists Rods available popular model engines Look RPM new innovative products proven performance records Richardson Precision Machining Inc 5070 Golden Or. San Jose CA 9512914081257-7059 Capacitors CI C2 C3 C6AVX 047 uf 50-volt CK7 tempco C4 C5AVX 001 uf 50-volt MOSFETs Siemens BUZ 10 equivalent 60-volt 20-amp Rds m finished speed control including MOSFETs available $49 An sembled board less MOSFETs available $29 Bare printed circuit board etched drilled solder reflowed $750 Con tact Jomar Products 2028 Knightsbridge Dr Cincinnati OH 45244 Congratulate/Kinning Continued page 47 until sky thins out number planes feel comfortable fly heavy air traffic remain control yourself well airplane dont get angry al have midair dont say illmannered things other fliers lousy flier doesnt have fun certainly tries does loops snap rolls around through trafficand pulls up sharply narrowly averts head-on because hes flying against pattern Sometimes nar rowly misses tail section someones pride joy seems could care less because hes having ball Worst gets angry verbally loses temper people cant about crowded situation can Landing times comes finish flight ready have looked see field clear have sig nalled let other fliers know intentions announcing loud voice Landing have looked see air space clear no other airplanes will interfere set up final approach cut throttle slow airplane grease another right front contrast poor flier will best overtake final approachor hell make tight circle landing pattern impeding traffic behind him sweep down fast-idle hard landing half way down field flier must watch him closely doesnt believe verbal signals has problem Nu advance planning mind wondering whats lunch whether buddies watching wild maneuvers Congratulations ordinary flying might say basic stuff instructor taught before soloed Theres nothing very remarkable about Besides bad-flier cases cited hypothetical could never happen real world RC Perhaps youre right Arent glad nobody flies like bad flier club bottom line next time youre flying field someone does something annoy congratulate self being better average enjoy able hobby both complex de manding fully realize irresponsible behavior reckless flying can tolerated Safety factor everyone connected model aviation concerned mustnt rest pat yourself back certainly flying keep both hands transmitter Continue think about what doing time start engine Get completely absorbed task flying airplane Plan moves execute smoothly noth ing surprise around have experience get through flight hand experience con siderable asset Congratulate yourself Youve earned RC Aerobatics/Van Putte Continued page 49 called Deveon White Two Ton Epoxy Un fortunately does seem available through normal hobby distributors least ones does business Hes sending sample try out works well claims Ill try find Out purchase put information column Right now Im working new 40-size powered Supertigre 60 sport airplane started about 12 years ago fiber glass fuselage purchased Royal Products about 1970 ought well cured now 140 Model Aviation D EE High perform engine connoc /%%1731 NW 45 Street Ft Lauderdale FL 33309 1395l 491-6115 ENGINEERING THE LANUING GEAR PEOPLE 1irsd hil landing gears dsnl lii year biggie prtperly II & II Enginoenig can seine four prsbleins * Cuattot haul four needs & specs gooratleelt Ia lit * Slrnog & durable Ia withstand toughest landing * 9 & 0 Engineering gear will warh & keep biggie hf log * In stack replaceniott lear 1st papolar models Byrun PitIs Christen EaIe CAP 21 Balsa USA J3 CUB Air Tech Powace Eagle lIsten Big Stick Champ Citulmna B & models Snapper Stinger Stopper Tat FOX 35 STUNT IN CONTINUOUS PRODUCTION FOR 34 YEARS Remember Control Line Simple Airplane atteries no servos requency problems lectric starters no tension way fly dont re-live yesteryears helping child young neighbor build fly Control Line Model Motor 35 Stunt course 34 years nobody has able improve ifs easy starting reliability list Line 15011 646-1656 Fox MFG Co 5305 TDWSON AVE FORT SMITH ARK 72901 AlTENTION ERS EPOXY GLASS COWLS FOR NOSEN PICA SIO MORGAN BALSA USA PIATT CONCEPT FLEET HOSTETLER RCM T-CRAFT SHEBER P171S iS & SCALE SUPER CUB POKKER 0-7 BOEING P- 12 P-26 F4B2 P4B4 SPARROW HAWK GEE BEE MOO r MACBRIENS TuRBULENT cHRISTEN EAGLE BRISIGHELLAS STARDUSTER II SCALE J3-BI BABY FLYBABY AIRCAMPER PILOT JUNGMANS t35 SCALE t/4 SCALE DECATHALON PIPER PAtB ft OTHERS WHEEL PANTS FOR CITABRIA STAROUSTER II PIUS SKYBOLT LINER TI SPORT CHRISTEN EAGLE PB E HAWK STEARMAN STINSON SR-S MULLIGAN ft OTHERS BRAZED & HEAT-TREATED WIRE GEARS& CABANES LARGE SCALE PLANS AVAILABLE Send SASE latest list supply Modelers fiberglass parts plansWrite call us T Et D FIBERGLASS SPECIALTIES 30925 eLOCK GARDEN CITY Ml 40136 PHONE 313 421-6358
