RADIO CONTROL ELECTRICS THIS MONTHS topics include backward look Ni-Cds stuff some info BEC operation limitations Amazing very much appreciatedthats what slow steady growth Ni-Cd battery technology over last two-plus decades has first floundering E-flights occurred 1972-73-when just about nothing Bpower available hobby shop including batteries time yourself struggle remember struggling rewind Radio Shack other toy motors make somewhat suitable flight task hand recall exasperation trying fit unwilling gears suitable prop small light homemade super-regen receiver Adams actuator still see myself trying power whole works old receiver pack comprised four button cells charged overnight classic manner no such thing high-rate charging Finally remember first powered sink half-circle original Electric ZAP 1 Powered sink first-flight failure ZAP 1 just didnt have kept added cell changed prop few days later successone full shoulder-height circle immediately followed powered sink ZAP did fly successfully flown Electric absolutely exciting mostly because accomplishment scratch no references no kits no Electric columns Nothing Boy did feel good first shoulder-height full circle until now Electric has up Nowadays first successful Electric flight anyone givena piece cake No challenge keys present-day Electric ease has steady performance progress Ni-Cd batteries four button cells mentioned thing days powering radios motors 450 mAh cells German made about 1 inches diameter maybe thick slow-charged very forgiving overcharge would sustain fairly light load todays standards cells just plain lousy took quite some time cells much better emerge recall eventually being able buy some better GE pencell size Ni-Cds few years later 70s better ways buttons still close todays products did allow advance six-to-eight-cell counts rewound geared slot-car motors operating just under 40 watts power systems easily flew 15-ounce rudder-only glider-type airplaneswell past ZAP experience next few years saw fairly rapid progress Ni-Cds soon well known 12 Ah sub C cell became cell use E-flight first experience early Astrolight packs also GE cells Astro sold part Electric flight systems Astro also 550 mAh size time best-working packs time still relatively fragile intolerant handling mishaps greatest care cells within pack became unbalanced rather quickly pack flight performance deteriorated few years later modelers caught Ni-Cd products Sanyo made big difference Electric flight Sanyo produced same-size 12 Ah cells much better anything used before Sanyo cells could safely charged higher rates lower internal resistance far durable accommodating E-system demands reasonable care cells lasted long time As recall earliest Sanyo l2s used SC yellow/red labels good things just described got better Sanyo came out red-label 12 Ah SCR types still have some use Later SOs l2s gave way l4s Sanyo found pack juice same can early mid-1990s welcomed arrival 17 SCRCs nowfamiliar black wrappers Most recently last year 2000s 2Os flightlines now high-performance E-flight times highest ever Will March 1998 85 Elextra 300 Dave Grife Coidwater Michigan KRC 97 Geared Astro 60 36 2000s Zinger 18 x 8 x 12 Claudia Garner photo Dave Grife honors well known E-modeler Keith Shaw making him pilot Elextra 300 Claudia Garner photo ever stop Hope takes batteries make what Bflight has become Ifs fair say aspects model power systems have progressed dramatically during last two decades includes motors ESCs model designs some hand-in-hand no market thered no investment B-modeling product development same time very product developments fostered growth E flight interest participationand product development Ive focused batteries might have focused other items well However believe heavy growing demand portable rechargable power industrial consumer market batteries have progressed much have has permitted level E-flight have today presentday motors electronicsas great arejust would job button cells two decades past Electronic Speed Controls ESCs among advancements contemporary BSC feature has become very popular BEC Batteiy Eliminator Circuit operation ESCs BEC option particularily popular smallest Electrics because weight saving important BEC feature allows speed control circuitry also power radio receiver servos diverting power motor battery Thus no onboard radio battery its extra ounces needed BEC practical must permit radio continue function safely motor battery gradually runs down should obvious dead motor battery automatically dead receiver battery BEC circuitry monitors motor pack voltage retards motor operation before pack gets too low radio can continue operateat least while can vary quite bit depending variables should always long enough permit safe return Lazy Bees Are So Slow Lazy Bees slow maneuverable can fly video shows em taking off train tracks flying indoors Short Wing Bees Best windy condi tions aerobatics Can roll per second video shows out ailerons doing rolling circle Long Wing Bees Docile glider-like Aileron Wing Bees Lazy Bee Special doing side slips knife edges inverted flight better trainers tralners Cox bought license Kadet anything else good pilot flying aerobatic rou tine wih Bee will steal show expert pilot flying anything else cant fly within walking distance home YOU NEED BEE Get hour-long video $10 Guaranteed amazing R/C plane video youve ever seen Price includes Priority Mail shipping next big thing worlds smallest servos & speed controls Gardner Clancy has em WES Technik Servos weigh 27 gramsll Amazing Coreless motor linear out put compatible R/O systems sold easy-to-assemble kit WES Technik high efficiency Speed Controls w/BEC weigh 7 grams handle 4 amps also have efficient small plane motors ever sold well special props super lightweight condensor mylar coverIngs ee aUZtWu 219 West 2nd Avenue 5210 Tel 602 649-1534 accept credit card COD OrderS. video FREE clubs & Hobby Shops Please let us know youre hurry well ship order same day C&uwt laiaUan ice 40 LAZY BEE KIT 049 15 size 48 LAZY BEE KIT Best electric 40 LAZY BEE SPECIAL 15 size w/Ailerons 50 LAZY BEE SPECIAL Best Aileron electric 40 SPEEDY BEE 15 25 size mid-wing FLOAT KIT above TREXLER Balloon Wheels 3-WHEEL SET above PUMP inflate Trexlers 72 BIG LAZY BEE up 20 cell electric 60 BIG LAZY BEE 25 60 sIze BIG LAZY BEE Wheel Set BIG LAZY BEE Heavy Duty 3-Wheel Set WES TECHNIK 27 gram servo Speed Control High Efficiency w/BEC 7 grams $59 $65 $69 $79 $79 $20 $15 $4 $119 $109 $19 $32 $79 $60 Annual favorite B-17 Oueenie Joe Beshar Joe board Joe Beshars Queenie large Astro 112D digital original ww II missions Four Astro 05s 32 cells charger easily nests inside fuselage its job beautiful Speeay ee built Ken Gardner Murray Utah young man Kens 5 year old grandson Hunter Simpson landing ESC designs its up assure case some info can help Some BEC designs simply shut down motor preset motor pack voltage level reachedand thats cold turkey shutdownno motor restarts does assure longest remaining charge radio operation hut least-favorite design Its best caught too far downwind BEC shuts motor down Other BEC circuits give warning Some cause sudden motor shutdown followed second two motor restart stop-start sequence will continue stop periods getting longer longer Its best back off throttle lower motor drain pack preserve receiver power resources way can fly approach position lower power levels still assuring solid radio operation Another kind BEC operation gradually reduces motor powerno dramatic stopstarts action much like normal battery mn-down Watch out variationits tempting just keep milking remaining power maintain some motor operation almost guaranteed get radio trouble can tick pack down realizing Remember BEC idea intended help save some weight complexity its worth have part keep airplane piece its clear motor being retarded ESC BEC function its time get lined up land can get better feel flying new system bench Another BEC-related consideration cell-count specification can confusing controls often specify two cell counts example ESC BEC may described 16-cell ESC same product may further described providing BEC operation up 10 cells What does mean Recall BEC function really additional feature ESC typical BEC circuit consists three-terminal lowoverhead IC regulator few peripheral parts make work Usually simple low-cost readily available integrated circuit powered motor battery outputs regulated voltage despite gradual mn-down source motor battery BECs use five-volt regulatorsjust what radios need Low overhead means regulator will work properly will continue hold five-volt output level very low voltage difference between input source battery output voltage Usually about 1/2 volt considered low overhead principle motor battery can run way down about 55 volts still permit unimpaired radio operation As battery voltage gets low enough additional circuitry ESC senses five-volt regulator jeopardy proceeds retard motor operation independent throttle stick override operation preempts further rapid decline motor pack voltage protects five-volt supply radio So much low pack can go high can pack go practical terms cells can used BEC Whatever specified limit such 10-cell example determining factor heat Pretend have 10-cell motor pack full charge voltage pack about 15 volts drops quickly about 11-12 volts throughout flight BEC output voltage five volts above voltage absorbed regulator about six seven volts over motor run time Radio operation includes servo operation imposes widely varying current demand receiver supply voltagein case BEC regulator flight having minimal servo peration such thermaling sailplane Old-Timer may have average current demand 1 15 amp vigorous flight routine such aerobatic model may have average current demand several hundred milliamps Lets peg latter 04 amps higher easily possible March 1998 87 PRECISION FIB ERGS Hundreds cowls radial cowls & wheelpants Strong lightweight one-piece construction Exact duplicate manufacturers original Phone orders information call 423-984-0828 Send $1 00 catalog $200 Outside US 9am -6pm EDT Dept 3 2805 Big Bend Dr ville TN 37803 EMS SERVO REVERSER Works AM FM PCM radios 4 5 cells Install line servo M servo will move opposite W direction 5 175 v 25 weight 25 sencel EMS SR-2 connector $1495 wired connecters $1995 EMS SR-2Y wired leg Y harness fer $2250 ULTIMATE BATTERY BACKER BEST way nsu e reliahie power mode Use two packs Wo ks standard 4 ce 5 e 5 GEL-CELL packs Battery packs can different capacity like 1200 600 1 5 v 1 5 5 75 weight 8 ounce $4995 wired connectors $5995 GEAR AND DOOR SEQUENCER microprocessor driver device controls sequences landing gear mechanism landing gear doers Works air and/sr servo cuntrolled systems Gear sews door sews travel time individually adjustahie toll speed ts 10 secuods Gear doors GLOW DRIVER may remain open ala P-Si close An opto-isolated glow d e am ch ha ense es against radio after lowering gear ala P-47 Gear noise ON point easily adjustahle hy user doesnt move until doors travel fully completed unit small screwdriver Size 15 v 15 v 75 Less 1 ounce must retract system Size 15 u 1 5 u 75 Less Supplied glow-plug wire connector User supplies own 1 ounce Includes sews cuneector receiver $4495 NICAD haflery Includes sews connector receiver $4495 Additional EMS Glitch Stop/Noise Trap GS-l$1250 Glitch Stop/Noise Trap Y Harness GS-l Y1500 NEW SRE-2000 Micro-Processor Reverser2495 NEW Beepo Flight Timer2995 NEWStOp-Go-LightT42495 Gear Door Cycler3495 Channel Failsafe3895 Opto-Isolated Electronic Switch3995 Dual E-Switch3995 Snitch Autoretract U/C3995 NEW Multi-Mode Electronic Mixer4495 Glitch Buster/6 Channel Opto-Isolator7995 Twin Engine Sync System8995 NEW NanoMAX Indoor Ultralight ESC4495 NEW MicroMAX Speed 400 ESC wIBEC5995 Electronic Model Systems 22605 E La Palma Ave Suite SiB Yorba Linda CA 92BB7 Info Only 714-692-1393 Orders Only BOO-B45-B97B vwwemsjornarcorn @emsjomaccom Jomar Products NEW MInIMAX 40 ESC w/BEC Brake$9995 MiniMAX Original ESC w/Brake7995 Sport MAX ESC8995 SM-4 ESC9995 Heavy Duty Reversible Nautical Throttle8995 BBC-1 Ball Bearing Conversion 4 Futaba2595 BBC-2 Ball Bearing Con version 1 Futaba695 BBC-3 Ball Bearing Conversion 4 Airtronics2595 BBC-4 Ball Bearing Conversion 1 Airtronics695 BBC-5 Ball Bearing Only JR etc 4199S BBC-6 Ball Bearing Only JR etc 1500 Aramid Kevlar 29 Rigging Cable 201000 #22 Servo Wire 3 cond 10 Fut JR Colors800 #22 Battery Wire -2 conductor- 10600 EMS/SANYO Battery PacksCALL EMS Connectors ExtensionsCALL examples mean average power dissipated BEC regulator ranges about 7 tt first example way up 4 x 7 atts latter calculations simply average current flow multiplied voltage across regulator power numbers cause quite bit associated heat regulator Properly designed ESC assemblies can safely accomodate heat gets harder harder increasing motor pack voltage Most regulator ICs have internal self-protection features shut down temperature gets too high others simply burn up result same no receiver power should clear BEC regulators can accommodate limited range motor pack cell counts Exceeding recommended cell count serves put BEC operation airplane jeopardy Remember totally independent matter over cells speed control function can handle motor cell-count limit BEC operation really hardship Generally speaking BEC attractive smaller lighter airplanes usually have low cell count anyway Larger cell counts generally associated much higher motor operating power levels larger airplanes case burden separate receiver pack really burden anyway Modern BEC operation very reliable does serve very good purpose flight applications time E-modeling life would consider using BEC hut times past Now just need keep mind whats happening fast high-flying airplane motor pack depletes resist temptation milk motor run time need self-control maintain model control have get airplane lined up land safely ESC/BEC warns end near So ends E-column Please enclose SASE correspondence youd like reply odel Aviation Shipping handling Per Order CA Residents Add Sales Tax Dealer Inquiries Invited 9
Edition: Model Aviation - 1998/03
Page Numbers: 85, 86, 87, 88
RADIO CONTROL ELECTRICS THIS MONTHS topics include backward look Ni-Cds stuff some info BEC operation limitations Amazing very much appreciatedthats what slow steady growth Ni-Cd battery technology over last two-plus decades has first floundering E-flights occurred 1972-73-when just about nothing Bpower available hobby shop including batteries time yourself struggle remember struggling rewind Radio Shack other toy motors make somewhat suitable flight task hand recall exasperation trying fit unwilling gears suitable prop small light homemade super-regen receiver Adams actuator still see myself trying power whole works old receiver pack comprised four button cells charged overnight classic manner no such thing high-rate charging Finally remember first powered sink half-circle original Electric ZAP 1 Powered sink first-flight failure ZAP 1 just didnt have kept added cell changed prop few days later successone full shoulder-height circle immediately followed powered sink ZAP did fly successfully flown Electric absolutely exciting mostly because accomplishment scratch no references no kits no Electric columns Nothing Boy did feel good first shoulder-height full circle until now Electric has up Nowadays first successful Electric flight anyone givena piece cake No challenge keys present-day Electric ease has steady performance progress Ni-Cd batteries four button cells mentioned thing days powering radios motors 450 mAh cells German made about 1 inches diameter maybe thick slow-charged very forgiving overcharge would sustain fairly light load todays standards cells just plain lousy took quite some time cells much better emerge recall eventually being able buy some better GE pencell size Ni-Cds few years later 70s better ways buttons still close todays products did allow advance six-to-eight-cell counts rewound geared slot-car motors operating just under 40 watts power systems easily flew 15-ounce rudder-only glider-type airplaneswell past ZAP experience next few years saw fairly rapid progress Ni-Cds soon well known 12 Ah sub C cell became cell use E-flight first experience early Astrolight packs also GE cells Astro sold part Electric flight systems Astro also 550 mAh size time best-working packs time still relatively fragile intolerant handling mishaps greatest care cells within pack became unbalanced rather quickly pack flight performance deteriorated few years later modelers caught Ni-Cd products Sanyo made big difference Electric flight Sanyo produced same-size 12 Ah cells much better anything used before Sanyo cells could safely charged higher rates lower internal resistance far durable accommodating E-system demands reasonable care cells lasted long time As recall earliest Sanyo l2s used SC yellow/red labels good things just described got better Sanyo came out red-label 12 Ah SCR types still have some use Later SOs l2s gave way l4s Sanyo found pack juice same can early mid-1990s welcomed arrival 17 SCRCs nowfamiliar black wrappers Most recently last year 2000s 2Os flightlines now high-performance E-flight times highest ever Will March 1998 85 Elextra 300 Dave Grife Coidwater Michigan KRC 97 Geared Astro 60 36 2000s Zinger 18 x 8 x 12 Claudia Garner photo Dave Grife honors well known E-modeler Keith Shaw making him pilot Elextra 300 Claudia Garner photo ever stop Hope takes batteries make what Bflight has become Ifs fair say aspects model power systems have progressed dramatically during last two decades includes motors ESCs model designs some hand-in-hand no market thered no investment B-modeling product development same time very product developments fostered growth E flight interest participationand product development Ive focused batteries might have focused other items well However believe heavy growing demand portable rechargable power industrial consumer market batteries have progressed much have has permitted level E-flight have today presentday motors electronicsas great arejust would job button cells two decades past Electronic Speed Controls ESCs among advancements contemporary BSC feature has become very popular BEC Batteiy Eliminator Circuit operation ESCs BEC option particularily popular smallest Electrics because weight saving important BEC feature allows speed control circuitry also power radio receiver servos diverting power motor battery Thus no onboard radio battery its extra ounces needed BEC practical must permit radio continue function safely motor battery gradually runs down should obvious dead motor battery automatically dead receiver battery BEC circuitry monitors motor pack voltage retards motor operation before pack gets too low radio can continue operateat least while can vary quite bit depending variables should always long enough permit safe return Lazy Bees Are So Slow Lazy Bees slow maneuverable can fly video shows em taking off train tracks flying indoors Short Wing Bees Best windy condi tions aerobatics Can roll per second video shows out ailerons doing rolling circle Long Wing Bees Docile glider-like Aileron Wing Bees Lazy Bee Special doing side slips knife edges inverted flight better trainers tralners Cox bought license Kadet anything else good pilot flying aerobatic rou tine wih Bee will steal show expert pilot flying anything else cant fly within walking distance home YOU NEED BEE Get hour-long video $10 Guaranteed amazing R/C plane video youve ever seen Price includes Priority Mail shipping next big thing worlds smallest servos & speed controls Gardner Clancy has em WES Technik Servos weigh 27 gramsll Amazing Coreless motor linear out put compatible R/O systems sold easy-to-assemble kit WES Technik high efficiency Speed Controls w/BEC weigh 7 grams handle 4 amps also have efficient small plane motors ever sold well special props super lightweight condensor mylar coverIngs ee aUZtWu 219 West 2nd Avenue 5210 Tel 602 649-1534 accept credit card COD OrderS. video FREE clubs & Hobby Shops Please let us know youre hurry well ship order same day C&uwt laiaUan ice 40 LAZY BEE KIT 049 15 size 48 LAZY BEE KIT Best electric 40 LAZY BEE SPECIAL 15 size w/Ailerons 50 LAZY BEE SPECIAL Best Aileron electric 40 SPEEDY BEE 15 25 size mid-wing FLOAT KIT above TREXLER Balloon Wheels 3-WHEEL SET above PUMP inflate Trexlers 72 BIG LAZY BEE up 20 cell electric 60 BIG LAZY BEE 25 60 sIze BIG LAZY BEE Wheel Set BIG LAZY BEE Heavy Duty 3-Wheel Set WES TECHNIK 27 gram servo Speed Control High Efficiency w/BEC 7 grams $59 $65 $69 $79 $79 $20 $15 $4 $119 $109 $19 $32 $79 $60 Annual favorite B-17 Oueenie Joe Beshar Joe board Joe Beshars Queenie large Astro 112D digital original ww II missions Four Astro 05s 32 cells charger easily nests inside fuselage its job beautiful Speeay ee built Ken Gardner Murray Utah young man Kens 5 year old grandson Hunter Simpson landing ESC designs its up assure case some info can help Some BEC designs simply shut down motor preset motor pack voltage level reachedand thats cold turkey shutdownno motor restarts does assure longest remaining charge radio operation hut least-favorite design Its best caught too far downwind BEC shuts motor down Other BEC circuits give warning Some cause sudden motor shutdown followed second two motor restart stop-start sequence will continue stop periods getting longer longer Its best back off throttle lower motor drain pack preserve receiver power resources way can fly approach position lower power levels still assuring solid radio operation Another kind BEC operation gradually reduces motor powerno dramatic stopstarts action much like normal battery mn-down Watch out variationits tempting just keep milking remaining power maintain some motor operation almost guaranteed get radio trouble can tick pack down realizing Remember BEC idea intended help save some weight complexity its worth have part keep airplane piece its clear motor being retarded ESC BEC function its time get lined up land can get better feel flying new system bench Another BEC-related consideration cell-count specification can confusing controls often specify two cell counts example ESC BEC may described 16-cell ESC same product may further described providing BEC operation up 10 cells What does mean Recall BEC function really additional feature ESC typical BEC circuit consists three-terminal lowoverhead IC regulator few peripheral parts make work Usually simple low-cost readily available integrated circuit powered motor battery outputs regulated voltage despite gradual mn-down source motor battery BECs use five-volt regulatorsjust what radios need Low overhead means regulator will work properly will continue hold five-volt output level very low voltage difference between input source battery output voltage Usually about 1/2 volt considered low overhead principle motor battery can run way down about 55 volts still permit unimpaired radio operation As battery voltage gets low enough additional circuitry ESC senses five-volt regulator jeopardy proceeds retard motor operation independent throttle stick override operation preempts further rapid decline motor pack voltage protects five-volt supply radio So much low pack can go high can pack go practical terms cells can used BEC Whatever specified limit such 10-cell example determining factor heat Pretend have 10-cell motor pack full charge voltage pack about 15 volts drops quickly about 11-12 volts throughout flight BEC output voltage five volts above voltage absorbed regulator about six seven volts over motor run time Radio operation includes servo operation imposes widely varying current demand receiver supply voltagein case BEC regulator flight having minimal servo peration such thermaling sailplane Old-Timer may have average current demand 1 15 amp vigorous flight routine such aerobatic model may have average current demand several hundred milliamps Lets peg latter 04 amps higher easily possible March 1998 87 PRECISION FIB ERGS Hundreds cowls radial cowls & wheelpants Strong lightweight one-piece construction Exact duplicate manufacturers original Phone orders information call 423-984-0828 Send $1 00 catalog $200 Outside US 9am -6pm EDT Dept 3 2805 Big Bend Dr ville TN 37803 EMS SERVO REVERSER Works AM FM PCM radios 4 5 cells Install line servo M servo will move opposite W direction 5 175 v 25 weight 25 sencel EMS SR-2 connector $1495 wired connecters $1995 EMS SR-2Y wired leg Y harness fer $2250 ULTIMATE BATTERY BACKER BEST way nsu e reliahie power mode Use two packs Wo ks standard 4 ce 5 e 5 GEL-CELL packs Battery packs can different capacity like 1200 600 1 5 v 1 5 5 75 weight 8 ounce $4995 wired connectors $5995 GEAR AND DOOR SEQUENCER microprocessor driver device controls sequences landing gear mechanism landing gear doers Works air and/sr servo cuntrolled systems Gear sews door sews travel time individually adjustahie toll speed ts 10 secuods Gear doors GLOW DRIVER may remain open ala P-Si close An opto-isolated glow d e am ch ha ense es against radio after lowering gear ala P-47 Gear noise ON point easily adjustahle hy user doesnt move until doors travel fully completed unit small screwdriver Size 15 v 15 v 75 Less 1 ounce must retract system Size 15 u 1 5 u 75 Less Supplied glow-plug wire connector User supplies own 1 ounce Includes sews cuneector receiver $4495 NICAD haflery Includes sews connector receiver $4495 Additional EMS Glitch Stop/Noise Trap GS-l$1250 Glitch Stop/Noise Trap Y Harness GS-l Y1500 NEW SRE-2000 Micro-Processor Reverser2495 NEW Beepo Flight Timer2995 NEWStOp-Go-LightT42495 Gear Door Cycler3495 Channel Failsafe3895 Opto-Isolated Electronic Switch3995 Dual E-Switch3995 Snitch Autoretract U/C3995 NEW Multi-Mode Electronic Mixer4495 Glitch Buster/6 Channel Opto-Isolator7995 Twin Engine Sync System8995 NEW NanoMAX Indoor Ultralight ESC4495 NEW MicroMAX Speed 400 ESC wIBEC5995 Electronic Model Systems 22605 E La Palma Ave Suite SiB Yorba Linda CA 92BB7 Info Only 714-692-1393 Orders Only BOO-B45-B97B vwwemsjornarcorn @emsjomaccom Jomar Products NEW MInIMAX 40 ESC w/BEC Brake$9995 MiniMAX Original ESC w/Brake7995 Sport MAX ESC8995 SM-4 ESC9995 Heavy Duty Reversible Nautical Throttle8995 BBC-1 Ball Bearing Conversion 4 Futaba2595 BBC-2 Ball Bearing Con version 1 Futaba695 BBC-3 Ball Bearing Conversion 4 Airtronics2595 BBC-4 Ball Bearing Conversion 1 Airtronics695 BBC-5 Ball Bearing Only JR etc 4199S BBC-6 Ball Bearing Only JR etc 1500 Aramid Kevlar 29 Rigging Cable 201000 #22 Servo Wire 3 cond 10 Fut JR Colors800 #22 Battery Wire -2 conductor- 10600 EMS/SANYO Battery PacksCALL EMS Connectors ExtensionsCALL examples mean average power dissipated BEC regulator ranges about 7 tt first example way up 4 x 7 atts latter calculations simply average current flow multiplied voltage across regulator power numbers cause quite bit associated heat regulator Properly designed ESC assemblies can safely accomodate heat gets harder harder increasing motor pack voltage Most regulator ICs have internal self-protection features shut down temperature gets too high others simply burn up result same no receiver power should clear BEC regulators can accommodate limited range motor pack cell counts Exceeding recommended cell count serves put BEC operation airplane jeopardy Remember totally independent matter over cells speed control function can handle motor cell-count limit BEC operation really hardship Generally speaking BEC attractive smaller lighter airplanes usually have low cell count anyway Larger cell counts generally associated much higher motor operating power levels larger airplanes case burden separate receiver pack really burden anyway Modern BEC operation very reliable does serve very good purpose flight applications time E-modeling life would consider using BEC hut times past Now just need keep mind whats happening fast high-flying airplane motor pack depletes resist temptation milk motor run time need self-control maintain model control have get airplane lined up land safely ESC/BEC warns end near So ends E-column Please enclose SASE correspondence youd like reply odel Aviation Shipping handling Per Order CA Residents Add Sales Tax Dealer Inquiries Invited 9
Edition: Model Aviation - 1998/03
Page Numbers: 85, 86, 87, 88
RADIO CONTROL ELECTRICS THIS MONTHS topics include backward look Ni-Cds stuff some info BEC operation limitations Amazing very much appreciatedthats what slow steady growth Ni-Cd battery technology over last two-plus decades has first floundering E-flights occurred 1972-73-when just about nothing Bpower available hobby shop including batteries time yourself struggle remember struggling rewind Radio Shack other toy motors make somewhat suitable flight task hand recall exasperation trying fit unwilling gears suitable prop small light homemade super-regen receiver Adams actuator still see myself trying power whole works old receiver pack comprised four button cells charged overnight classic manner no such thing high-rate charging Finally remember first powered sink half-circle original Electric ZAP 1 Powered sink first-flight failure ZAP 1 just didnt have kept added cell changed prop few days later successone full shoulder-height circle immediately followed powered sink ZAP did fly successfully flown Electric absolutely exciting mostly because accomplishment scratch no references no kits no Electric columns Nothing Boy did feel good first shoulder-height full circle until now Electric has up Nowadays first successful Electric flight anyone givena piece cake No challenge keys present-day Electric ease has steady performance progress Ni-Cd batteries four button cells mentioned thing days powering radios motors 450 mAh cells German made about 1 inches diameter maybe thick slow-charged very forgiving overcharge would sustain fairly light load todays standards cells just plain lousy took quite some time cells much better emerge recall eventually being able buy some better GE pencell size Ni-Cds few years later 70s better ways buttons still close todays products did allow advance six-to-eight-cell counts rewound geared slot-car motors operating just under 40 watts power systems easily flew 15-ounce rudder-only glider-type airplaneswell past ZAP experience next few years saw fairly rapid progress Ni-Cds soon well known 12 Ah sub C cell became cell use E-flight first experience early Astrolight packs also GE cells Astro sold part Electric flight systems Astro also 550 mAh size time best-working packs time still relatively fragile intolerant handling mishaps greatest care cells within pack became unbalanced rather quickly pack flight performance deteriorated few years later modelers caught Ni-Cd products Sanyo made big difference Electric flight Sanyo produced same-size 12 Ah cells much better anything used before Sanyo cells could safely charged higher rates lower internal resistance far durable accommodating E-system demands reasonable care cells lasted long time As recall earliest Sanyo l2s used SC yellow/red labels good things just described got better Sanyo came out red-label 12 Ah SCR types still have some use Later SOs l2s gave way l4s Sanyo found pack juice same can early mid-1990s welcomed arrival 17 SCRCs nowfamiliar black wrappers Most recently last year 2000s 2Os flightlines now high-performance E-flight times highest ever Will March 1998 85 Elextra 300 Dave Grife Coidwater Michigan KRC 97 Geared Astro 60 36 2000s Zinger 18 x 8 x 12 Claudia Garner photo Dave Grife honors well known E-modeler Keith Shaw making him pilot Elextra 300 Claudia Garner photo ever stop Hope takes batteries make what Bflight has become Ifs fair say aspects model power systems have progressed dramatically during last two decades includes motors ESCs model designs some hand-in-hand no market thered no investment B-modeling product development same time very product developments fostered growth E flight interest participationand product development Ive focused batteries might have focused other items well However believe heavy growing demand portable rechargable power industrial consumer market batteries have progressed much have has permitted level E-flight have today presentday motors electronicsas great arejust would job button cells two decades past Electronic Speed Controls ESCs among advancements contemporary BSC feature has become very popular BEC Batteiy Eliminator Circuit operation ESCs BEC option particularily popular smallest Electrics because weight saving important BEC feature allows speed control circuitry also power radio receiver servos diverting power motor battery Thus no onboard radio battery its extra ounces needed BEC practical must permit radio continue function safely motor battery gradually runs down should obvious dead motor battery automatically dead receiver battery BEC circuitry monitors motor pack voltage retards motor operation before pack gets too low radio can continue operateat least while can vary quite bit depending variables should always long enough permit safe return Lazy Bees Are So Slow Lazy Bees slow maneuverable can fly video shows em taking off train tracks flying indoors Short Wing Bees Best windy condi tions aerobatics Can roll per second video shows out ailerons doing rolling circle Long Wing Bees Docile glider-like Aileron Wing Bees Lazy Bee Special doing side slips knife edges inverted flight better trainers tralners Cox bought license Kadet anything else good pilot flying aerobatic rou tine wih Bee will steal show expert pilot flying anything else cant fly within walking distance home YOU NEED BEE Get hour-long video $10 Guaranteed amazing R/C plane video youve ever seen Price includes Priority Mail shipping next big thing worlds smallest servos & speed controls Gardner Clancy has em WES Technik Servos weigh 27 gramsll Amazing Coreless motor linear out put compatible R/O systems sold easy-to-assemble kit WES Technik high efficiency Speed Controls w/BEC weigh 7 grams handle 4 amps also have efficient small plane motors ever sold well special props super lightweight condensor mylar coverIngs ee aUZtWu 219 West 2nd Avenue 5210 Tel 602 649-1534 accept credit card COD OrderS. video FREE clubs & Hobby Shops Please let us know youre hurry well ship order same day C&uwt laiaUan ice 40 LAZY BEE KIT 049 15 size 48 LAZY BEE KIT Best electric 40 LAZY BEE SPECIAL 15 size w/Ailerons 50 LAZY BEE SPECIAL Best Aileron electric 40 SPEEDY BEE 15 25 size mid-wing FLOAT KIT above TREXLER Balloon Wheels 3-WHEEL SET above PUMP inflate Trexlers 72 BIG LAZY BEE up 20 cell electric 60 BIG LAZY BEE 25 60 sIze BIG LAZY BEE Wheel Set BIG LAZY BEE Heavy Duty 3-Wheel Set WES TECHNIK 27 gram servo Speed Control High Efficiency w/BEC 7 grams $59 $65 $69 $79 $79 $20 $15 $4 $119 $109 $19 $32 $79 $60 Annual favorite B-17 Oueenie Joe Beshar Joe board Joe Beshars Queenie large Astro 112D digital original ww II missions Four Astro 05s 32 cells charger easily nests inside fuselage its job beautiful Speeay ee built Ken Gardner Murray Utah young man Kens 5 year old grandson Hunter Simpson landing ESC designs its up assure case some info can help Some BEC designs simply shut down motor preset motor pack voltage level reachedand thats cold turkey shutdownno motor restarts does assure longest remaining charge radio operation hut least-favorite design Its best caught too far downwind BEC shuts motor down Other BEC circuits give warning Some cause sudden motor shutdown followed second two motor restart stop-start sequence will continue stop periods getting longer longer Its best back off throttle lower motor drain pack preserve receiver power resources way can fly approach position lower power levels still assuring solid radio operation Another kind BEC operation gradually reduces motor powerno dramatic stopstarts action much like normal battery mn-down Watch out variationits tempting just keep milking remaining power maintain some motor operation almost guaranteed get radio trouble can tick pack down realizing Remember BEC idea intended help save some weight complexity its worth have part keep airplane piece its clear motor being retarded ESC BEC function its time get lined up land can get better feel flying new system bench Another BEC-related consideration cell-count specification can confusing controls often specify two cell counts example ESC BEC may described 16-cell ESC same product may further described providing BEC operation up 10 cells What does mean Recall BEC function really additional feature ESC typical BEC circuit consists three-terminal lowoverhead IC regulator few peripheral parts make work Usually simple low-cost readily available integrated circuit powered motor battery outputs regulated voltage despite gradual mn-down source motor battery BECs use five-volt regulatorsjust what radios need Low overhead means regulator will work properly will continue hold five-volt output level very low voltage difference between input source battery output voltage Usually about 1/2 volt considered low overhead principle motor battery can run way down about 55 volts still permit unimpaired radio operation As battery voltage gets low enough additional circuitry ESC senses five-volt regulator jeopardy proceeds retard motor operation independent throttle stick override operation preempts further rapid decline motor pack voltage protects five-volt supply radio So much low pack can go high can pack go practical terms cells can used BEC Whatever specified limit such 10-cell example determining factor heat Pretend have 10-cell motor pack full charge voltage pack about 15 volts drops quickly about 11-12 volts throughout flight BEC output voltage five volts above voltage absorbed regulator about six seven volts over motor run time Radio operation includes servo operation imposes widely varying current demand receiver supply voltagein case BEC regulator flight having minimal servo peration such thermaling sailplane Old-Timer may have average current demand 1 15 amp vigorous flight routine such aerobatic model may have average current demand several hundred milliamps Lets peg latter 04 amps higher easily possible March 1998 87 PRECISION FIB ERGS Hundreds cowls radial cowls & wheelpants Strong lightweight one-piece construction Exact duplicate manufacturers original Phone orders information call 423-984-0828 Send $1 00 catalog $200 Outside US 9am -6pm EDT Dept 3 2805 Big Bend Dr ville TN 37803 EMS SERVO REVERSER Works AM FM PCM radios 4 5 cells Install line servo M servo will move opposite W direction 5 175 v 25 weight 25 sencel EMS SR-2 connector $1495 wired connecters $1995 EMS SR-2Y wired leg Y harness fer $2250 ULTIMATE BATTERY BACKER BEST way nsu e reliahie power mode Use two packs Wo ks standard 4 ce 5 e 5 GEL-CELL packs Battery packs can different capacity like 1200 600 1 5 v 1 5 5 75 weight 8 ounce $4995 wired connectors $5995 GEAR AND DOOR SEQUENCER microprocessor driver device controls sequences landing gear mechanism landing gear doers Works air and/sr servo cuntrolled systems Gear sews door sews travel time individually adjustahie toll speed ts 10 secuods Gear doors GLOW DRIVER may remain open ala P-Si close An opto-isolated glow d e am ch ha ense es against radio after lowering gear ala P-47 Gear noise ON point easily adjustahle hy user doesnt move until doors travel fully completed unit small screwdriver Size 15 v 15 v 75 Less 1 ounce must retract system Size 15 u 1 5 u 75 Less Supplied glow-plug wire connector User supplies own 1 ounce Includes sews cuneector receiver $4495 NICAD haflery Includes sews connector receiver $4495 Additional EMS Glitch Stop/Noise Trap GS-l$1250 Glitch Stop/Noise Trap Y Harness GS-l Y1500 NEW SRE-2000 Micro-Processor Reverser2495 NEW Beepo Flight Timer2995 NEWStOp-Go-LightT42495 Gear Door Cycler3495 Channel Failsafe3895 Opto-Isolated Electronic Switch3995 Dual E-Switch3995 Snitch Autoretract U/C3995 NEW Multi-Mode Electronic Mixer4495 Glitch Buster/6 Channel Opto-Isolator7995 Twin Engine Sync System8995 NEW NanoMAX Indoor Ultralight ESC4495 NEW MicroMAX Speed 400 ESC wIBEC5995 Electronic Model Systems 22605 E La Palma Ave Suite SiB Yorba Linda CA 92BB7 Info Only 714-692-1393 Orders Only BOO-B45-B97B vwwemsjornarcorn @emsjomaccom Jomar Products NEW MInIMAX 40 ESC w/BEC Brake$9995 MiniMAX Original ESC w/Brake7995 Sport MAX ESC8995 SM-4 ESC9995 Heavy Duty Reversible Nautical Throttle8995 BBC-1 Ball Bearing Conversion 4 Futaba2595 BBC-2 Ball Bearing Con version 1 Futaba695 BBC-3 Ball Bearing Conversion 4 Airtronics2595 BBC-4 Ball Bearing Conversion 1 Airtronics695 BBC-5 Ball Bearing Only JR etc 4199S BBC-6 Ball Bearing Only JR etc 1500 Aramid Kevlar 29 Rigging Cable 201000 #22 Servo Wire 3 cond 10 Fut JR Colors800 #22 Battery Wire -2 conductor- 10600 EMS/SANYO Battery PacksCALL EMS Connectors ExtensionsCALL examples mean average power dissipated BEC regulator ranges about 7 tt first example way up 4 x 7 atts latter calculations simply average current flow multiplied voltage across regulator power numbers cause quite bit associated heat regulator Properly designed ESC assemblies can safely accomodate heat gets harder harder increasing motor pack voltage Most regulator ICs have internal self-protection features shut down temperature gets too high others simply burn up result same no receiver power should clear BEC regulators can accommodate limited range motor pack cell counts Exceeding recommended cell count serves put BEC operation airplane jeopardy Remember totally independent matter over cells speed control function can handle motor cell-count limit BEC operation really hardship Generally speaking BEC attractive smaller lighter airplanes usually have low cell count anyway Larger cell counts generally associated much higher motor operating power levels larger airplanes case burden separate receiver pack really burden anyway Modern BEC operation very reliable does serve very good purpose flight applications time E-modeling life would consider using BEC hut times past Now just need keep mind whats happening fast high-flying airplane motor pack depletes resist temptation milk motor run time need self-control maintain model control have get airplane lined up land safely ESC/BEC warns end near So ends E-column Please enclose SASE correspondence youd like reply odel Aviation Shipping handling Per Order CA Residents Add Sales Tax Dealer Inquiries Invited 9
Edition: Model Aviation - 1998/03
Page Numbers: 85, 86, 87, 88
RADIO CONTROL ELECTRICS THIS MONTHS topics include backward look Ni-Cds stuff some info BEC operation limitations Amazing very much appreciatedthats what slow steady growth Ni-Cd battery technology over last two-plus decades has first floundering E-flights occurred 1972-73-when just about nothing Bpower available hobby shop including batteries time yourself struggle remember struggling rewind Radio Shack other toy motors make somewhat suitable flight task hand recall exasperation trying fit unwilling gears suitable prop small light homemade super-regen receiver Adams actuator still see myself trying power whole works old receiver pack comprised four button cells charged overnight classic manner no such thing high-rate charging Finally remember first powered sink half-circle original Electric ZAP 1 Powered sink first-flight failure ZAP 1 just didnt have kept added cell changed prop few days later successone full shoulder-height circle immediately followed powered sink ZAP did fly successfully flown Electric absolutely exciting mostly because accomplishment scratch no references no kits no Electric columns Nothing Boy did feel good first shoulder-height full circle until now Electric has up Nowadays first successful Electric flight anyone givena piece cake No challenge keys present-day Electric ease has steady performance progress Ni-Cd batteries four button cells mentioned thing days powering radios motors 450 mAh cells German made about 1 inches diameter maybe thick slow-charged very forgiving overcharge would sustain fairly light load todays standards cells just plain lousy took quite some time cells much better emerge recall eventually being able buy some better GE pencell size Ni-Cds few years later 70s better ways buttons still close todays products did allow advance six-to-eight-cell counts rewound geared slot-car motors operating just under 40 watts power systems easily flew 15-ounce rudder-only glider-type airplaneswell past ZAP experience next few years saw fairly rapid progress Ni-Cds soon well known 12 Ah sub C cell became cell use E-flight first experience early Astrolight packs also GE cells Astro sold part Electric flight systems Astro also 550 mAh size time best-working packs time still relatively fragile intolerant handling mishaps greatest care cells within pack became unbalanced rather quickly pack flight performance deteriorated few years later modelers caught Ni-Cd products Sanyo made big difference Electric flight Sanyo produced same-size 12 Ah cells much better anything used before Sanyo cells could safely charged higher rates lower internal resistance far durable accommodating E-system demands reasonable care cells lasted long time As recall earliest Sanyo l2s used SC yellow/red labels good things just described got better Sanyo came out red-label 12 Ah SCR types still have some use Later SOs l2s gave way l4s Sanyo found pack juice same can early mid-1990s welcomed arrival 17 SCRCs nowfamiliar black wrappers Most recently last year 2000s 2Os flightlines now high-performance E-flight times highest ever Will March 1998 85 Elextra 300 Dave Grife Coidwater Michigan KRC 97 Geared Astro 60 36 2000s Zinger 18 x 8 x 12 Claudia Garner photo Dave Grife honors well known E-modeler Keith Shaw making him pilot Elextra 300 Claudia Garner photo ever stop Hope takes batteries make what Bflight has become Ifs fair say aspects model power systems have progressed dramatically during last two decades includes motors ESCs model designs some hand-in-hand no market thered no investment B-modeling product development same time very product developments fostered growth E flight interest participationand product development Ive focused batteries might have focused other items well However believe heavy growing demand portable rechargable power industrial consumer market batteries have progressed much have has permitted level E-flight have today presentday motors electronicsas great arejust would job button cells two decades past Electronic Speed Controls ESCs among advancements contemporary BSC feature has become very popular BEC Batteiy Eliminator Circuit operation ESCs BEC option particularily popular smallest Electrics because weight saving important BEC feature allows speed control circuitry also power radio receiver servos diverting power motor battery Thus no onboard radio battery its extra ounces needed BEC practical must permit radio continue function safely motor battery gradually runs down should obvious dead motor battery automatically dead receiver battery BEC circuitry monitors motor pack voltage retards motor operation before pack gets too low radio can continue operateat least while can vary quite bit depending variables should always long enough permit safe return Lazy Bees Are So Slow Lazy Bees slow maneuverable can fly video shows em taking off train tracks flying indoors Short Wing Bees Best windy condi tions aerobatics Can roll per second video shows out ailerons doing rolling circle Long Wing Bees Docile glider-like Aileron Wing Bees Lazy Bee Special doing side slips knife edges inverted flight better trainers tralners Cox bought license Kadet anything else good pilot flying aerobatic rou tine wih Bee will steal show expert pilot flying anything else cant fly within walking distance home YOU NEED BEE Get hour-long video $10 Guaranteed amazing R/C plane video youve ever seen Price includes Priority Mail shipping next big thing worlds smallest servos & speed controls Gardner Clancy has em WES Technik Servos weigh 27 gramsll Amazing Coreless motor linear out put compatible R/O systems sold easy-to-assemble kit WES Technik high efficiency Speed Controls w/BEC weigh 7 grams handle 4 amps also have efficient small plane motors ever sold well special props super lightweight condensor mylar coverIngs ee aUZtWu 219 West 2nd Avenue 5210 Tel 602 649-1534 accept credit card COD OrderS. video FREE clubs & Hobby Shops Please let us know youre hurry well ship order same day C&uwt laiaUan ice 40 LAZY BEE KIT 049 15 size 48 LAZY BEE KIT Best electric 40 LAZY BEE SPECIAL 15 size w/Ailerons 50 LAZY BEE SPECIAL Best Aileron electric 40 SPEEDY BEE 15 25 size mid-wing FLOAT KIT above TREXLER Balloon Wheels 3-WHEEL SET above PUMP inflate Trexlers 72 BIG LAZY BEE up 20 cell electric 60 BIG LAZY BEE 25 60 sIze BIG LAZY BEE Wheel Set BIG LAZY BEE Heavy Duty 3-Wheel Set WES TECHNIK 27 gram servo Speed Control High Efficiency w/BEC 7 grams $59 $65 $69 $79 $79 $20 $15 $4 $119 $109 $19 $32 $79 $60 Annual favorite B-17 Oueenie Joe Beshar Joe board Joe Beshars Queenie large Astro 112D digital original ww II missions Four Astro 05s 32 cells charger easily nests inside fuselage its job beautiful Speeay ee built Ken Gardner Murray Utah young man Kens 5 year old grandson Hunter Simpson landing ESC designs its up assure case some info can help Some BEC designs simply shut down motor preset motor pack voltage level reachedand thats cold turkey shutdownno motor restarts does assure longest remaining charge radio operation hut least-favorite design Its best caught too far downwind BEC shuts motor down Other BEC circuits give warning Some cause sudden motor shutdown followed second two motor restart stop-start sequence will continue stop periods getting longer longer Its best back off throttle lower motor drain pack preserve receiver power resources way can fly approach position lower power levels still assuring solid radio operation Another kind BEC operation gradually reduces motor powerno dramatic stopstarts action much like normal battery mn-down Watch out variationits tempting just keep milking remaining power maintain some motor operation almost guaranteed get radio trouble can tick pack down realizing Remember BEC idea intended help save some weight complexity its worth have part keep airplane piece its clear motor being retarded ESC BEC function its time get lined up land can get better feel flying new system bench Another BEC-related consideration cell-count specification can confusing controls often specify two cell counts example ESC BEC may described 16-cell ESC same product may further described providing BEC operation up 10 cells What does mean Recall BEC function really additional feature ESC typical BEC circuit consists three-terminal lowoverhead IC regulator few peripheral parts make work Usually simple low-cost readily available integrated circuit powered motor battery outputs regulated voltage despite gradual mn-down source motor battery BECs use five-volt regulatorsjust what radios need Low overhead means regulator will work properly will continue hold five-volt output level very low voltage difference between input source battery output voltage Usually about 1/2 volt considered low overhead principle motor battery can run way down about 55 volts still permit unimpaired radio operation As battery voltage gets low enough additional circuitry ESC senses five-volt regulator jeopardy proceeds retard motor operation independent throttle stick override operation preempts further rapid decline motor pack voltage protects five-volt supply radio So much low pack can go high can pack go practical terms cells can used BEC Whatever specified limit such 10-cell example determining factor heat Pretend have 10-cell motor pack full charge voltage pack about 15 volts drops quickly about 11-12 volts throughout flight BEC output voltage five volts above voltage absorbed regulator about six seven volts over motor run time Radio operation includes servo operation imposes widely varying current demand receiver supply voltagein case BEC regulator flight having minimal servo peration such thermaling sailplane Old-Timer may have average current demand 1 15 amp vigorous flight routine such aerobatic model may have average current demand several hundred milliamps Lets peg latter 04 amps higher easily possible March 1998 87 PRECISION FIB ERGS Hundreds cowls radial cowls & wheelpants Strong lightweight one-piece construction Exact duplicate manufacturers original Phone orders information call 423-984-0828 Send $1 00 catalog $200 Outside US 9am -6pm EDT Dept 3 2805 Big Bend Dr ville TN 37803 EMS SERVO REVERSER Works AM FM PCM radios 4 5 cells Install line servo M servo will move opposite W direction 5 175 v 25 weight 25 sencel EMS SR-2 connector $1495 wired connecters $1995 EMS SR-2Y wired leg Y harness fer $2250 ULTIMATE BATTERY BACKER BEST way nsu e reliahie power mode Use two packs Wo ks standard 4 ce 5 e 5 GEL-CELL packs Battery packs can different capacity like 1200 600 1 5 v 1 5 5 75 weight 8 ounce $4995 wired connectors $5995 GEAR AND DOOR SEQUENCER microprocessor driver device controls sequences landing gear mechanism landing gear doers Works air and/sr servo cuntrolled systems Gear sews door sews travel time individually adjustahie toll speed ts 10 secuods Gear doors GLOW DRIVER may remain open ala P-Si close An opto-isolated glow d e am ch ha ense es against radio after lowering gear ala P-47 Gear noise ON point easily adjustahle hy user doesnt move until doors travel fully completed unit small screwdriver Size 15 v 15 v 75 Less 1 ounce must retract system Size 15 u 1 5 u 75 Less Supplied glow-plug wire connector User supplies own 1 ounce Includes sews cuneector receiver $4495 NICAD haflery Includes sews connector receiver $4495 Additional EMS Glitch Stop/Noise Trap GS-l$1250 Glitch Stop/Noise Trap Y Harness GS-l Y1500 NEW SRE-2000 Micro-Processor Reverser2495 NEW Beepo Flight Timer2995 NEWStOp-Go-LightT42495 Gear Door Cycler3495 Channel Failsafe3895 Opto-Isolated Electronic Switch3995 Dual E-Switch3995 Snitch Autoretract U/C3995 NEW Multi-Mode Electronic Mixer4495 Glitch Buster/6 Channel Opto-Isolator7995 Twin Engine Sync System8995 NEW NanoMAX Indoor Ultralight ESC4495 NEW MicroMAX Speed 400 ESC wIBEC5995 Electronic Model Systems 22605 E La Palma Ave Suite SiB Yorba Linda CA 92BB7 Info Only 714-692-1393 Orders Only BOO-B45-B97B vwwemsjornarcorn @emsjomaccom Jomar Products NEW MInIMAX 40 ESC w/BEC Brake$9995 MiniMAX Original ESC w/Brake7995 Sport MAX ESC8995 SM-4 ESC9995 Heavy Duty Reversible Nautical Throttle8995 BBC-1 Ball Bearing Conversion 4 Futaba2595 BBC-2 Ball Bearing Con version 1 Futaba695 BBC-3 Ball Bearing Conversion 4 Airtronics2595 BBC-4 Ball Bearing Conversion 1 Airtronics695 BBC-5 Ball Bearing Only JR etc 4199S BBC-6 Ball Bearing Only JR etc 1500 Aramid Kevlar 29 Rigging Cable 201000 #22 Servo Wire 3 cond 10 Fut JR Colors800 #22 Battery Wire -2 conductor- 10600 EMS/SANYO Battery PacksCALL EMS Connectors ExtensionsCALL examples mean average power dissipated BEC regulator ranges about 7 tt first example way up 4 x 7 atts latter calculations simply average current flow multiplied voltage across regulator power numbers cause quite bit associated heat regulator Properly designed ESC assemblies can safely accomodate heat gets harder harder increasing motor pack voltage Most regulator ICs have internal self-protection features shut down temperature gets too high others simply burn up result same no receiver power should clear BEC regulators can accommodate limited range motor pack cell counts Exceeding recommended cell count serves put BEC operation airplane jeopardy Remember totally independent matter over cells speed control function can handle motor cell-count limit BEC operation really hardship Generally speaking BEC attractive smaller lighter airplanes usually have low cell count anyway Larger cell counts generally associated much higher motor operating power levels larger airplanes case burden separate receiver pack really burden anyway Modern BEC operation very reliable does serve very good purpose flight applications time E-modeling life would consider using BEC hut times past Now just need keep mind whats happening fast high-flying airplane motor pack depletes resist temptation milk motor run time need self-control maintain model control have get airplane lined up land safely ESC/BEC warns end near So ends E-column Please enclose SASE correspondence youd like reply odel Aviation Shipping handling Per Order CA Residents Add Sales Tax Dealer Inquiries Invited 9