U George M Mye 3@ yL7L1J iJy aeu mu r mu t BATTERIES AND SOME GOOD OLD CHARGERS periodic table elements simple attended high school no manufactured elements radjoisotopes started work navy aircraft got interested galvanic series corrosion Batteries depend both lists can make battery out literally anything couple pieces metal some sea water will Super Batteries Triple Time Between Recharges reads headline Computer Shopper magazine seems AER Re search Atlanta Georgia has revived old zinc-air cell licensed technology make rechargeable 1-pound battery has offered notebook computer manufacturers Valence Technology San Jose California working lithium polymer cell also notebook computers thin-film device stage development say tolerates 150 deep-discharge cycles dont state current capacity Neither cells available right now can assume few things based what know computers First will low-voltage low-current batter ies designed discharge over three hours will have no immediate application Electric airplanes allow longer operating time same bulk might useful transmitters receivers new battery type has already appeared uses nickel metal hydride plates NiMH practical purposes can think nickel-cadmium battery double charge capacity cadmium goes landfill poisons drinking water NiMH batteries can purchased now extend operating time transmitters receivers increasing weight bulk used laptop computers portable telephones US vendor NiMH cells High TEK Models makes available AA cells 1100 mAh 24 grams $6 full C cells 35Ah 80 grams $13 designed one-hour discharge maximum rate 16-hour recharge will note batteries weigh half much comparable Ni-Cd cells Charging NiMH Batteries General purpose NiIvIH cells designed constant-current 16-hour charging C/l0 rate During over charge heat generated proportion rate overcharge Trickle charging less C/10 can maintained indefinitely According manufacturers literature NiMH cells can constructed 15-minute charging trick find someone has Temperature effects Fast charging requires temperature voltage control Depending charge rate temperature rise 50 100C absolute limit temperature 350 450C must observed voltage curve NiMH batteries similar Ni-Cd batteries dV/dt peak slope detection can used temperature range charging is00 400C discharging 10O 500C storage 20o 350C Armed information sailplaners people PCM systems instance should find combination NiMH batter ies MEN Model Engineering Norwalk charger very attractive small servos now used sailplanes consume current standard servos few years back NiMH batteries can have double energy capacity stan 111 Transition Low High Rate Complete Rapid Chwgang 4 900 00 dard 600-mAh pen cell pack increasing weight bulk SOME USEFUL CHARGERS 1 RC systems NiMil batteries An interesting thing has learned about charging NiMH AA cells old MEN charger see Radio Technique September 1980 issue Model Aviation seems good tool job because works sensing voltage tapers charge along recommended schedule NiMH batteries Im assuming dont save old magazines since might interested what said will include parts original MEN article have also added some new thoughts Briefly MEN C-504 pulse charger two outputs usually eight Ni-Cds four though other configurations available oscilloscope voltage waveform looks like half-wave rectified AC peak value 25 volts An SCR controls phase angle charger starts delivering current battery net effect charge starts pulses 3¼-amp current tapers down about 20 mA charger isnt delivering current measures battery voltage called valley sensing purpose controlling charge have left Trajectory High Charging Rate Magnitude High Rate Peak Above Battery Voltage Pro portional Battery Resistance Trajectory Low Charging Rate Voltage Battery Voltage Thu Monitored Charger observed output voltage characterIstIcs MEN charger dIrect-coupled oscIlloscope resulting caciliogram looks like sketch High Rate LED flickering Low Charging Rate trajectory used times betteryvoitage above preset cut off voltage 55 VOC 4-cell pack High Charging Rate trajectory uaed battery voltage below point transitIon moves 0 go degrees battery voltage rises 40 55 VOC High Rate charging ceases battery voltage above 55 VOC Annotated oscillogram showing MEN charger sends pulses Current battery Radio Technique ModelAviation September 1980 60 Model Aviation eries connected MEN charger months damage original MEN charger sensi tive spikes 110 VAC line put certain kinds electric motors used much energy conser vation reasons spikes could cause charger fail either full full off Semiconductors made better today problem rarely appeared rarer today Stability measuring circuit excellent cannot measure voltage cur rent MEN charger conventional AC/DC meters settling time digital meters too long never settle correct value Coil-type meters can damaged pulses panel-mount-type meter would damaged iron vane meter So unless have oscilloscope iron vane meter dont try Summarizing 1980 article clipped idle 500-mAh pack MEN After few minutes LED flickered went out discharged pack measured 300 mAh Repeated test LED went out 23 minutes Discharge test 300 mAh Back charger 16 hours Next day dis charged pack found 475 mAh Thinking might mistake charged pack again Flickering stopped 34 minutes 16 hours later pack discharged 475 mAh Cycling pack restored its capacity MEN charger no problem either its high-resistance idle state its low-resistance active state took another transmitter off shelf tested its pack rather typical history always recharged manufacturers 50-mA charger seen partial discharges service Capacity down 350 mAh candidate battery replacement Discharge two-hour rate followed 16-hour recharging MEN produced following results 350 375 400 400 mAli attached 10-ohm 10-watt resistor pack took way down 0 volts An eight-hour recharge MEN yielded test capacity 450 mAh might say routine saved battery scrap pile several MEN charger models dont know what voltage MEN set look serial number see numbers four eight cells see H old Kraft Sport series four five cells An 5 tells Cox/Sanwa four nine cells An X tells old Kraft Signature World Engines systems four 10 cells An R tells two 4-cell packs find letter dont want serial number MEN charger less 8200 dont junk charger would prudent send back MEN general cleaning and/or update simple change circuit eliminates problem discussed above Other simple modifications can change voltages what want will spend about $15 $30 half return postage get back like-new charger now lists $9495 2 electric-powered models RC systems NiMH batteries As mentioned July 92 issue MA use SR Smart Charger/Cycler electric-pow ered models expensive gets job done Accepting power either AC power supply car battery prefer red will charge two 28 cells time currents 100 mA five amps Three cutoffs active same time will stop fast-charging battery temperature rises lOT battery voltage peaks preset timer reaches its limit three cutoffs active fast-charging mode Since has devices should suitable charging NiMH batteries 3 12-volt gel cells CaRa 12 VDC Smart Charger PLUS accepts 110 VAC input power just sits blinking takes care 12-volt battery has done several years thing can wrong charger reverse connections battery have 17 amp-hour gel-cell intended burglar alarms use power SR Smart Charger/Cycler still use noisemakers might use start engines carry battery padded shoulder bag designed small video camera CaRa charger rides will ready needed about much weight am willing carry charges electric airplanes day long 4 Other chargers transmitters receivers RC systems stand idle lot like winter should use charger came set instructed least once per month will keep batteries healthy minimum cost September 1993 61 Above MEN Charger have ready use NiMH battery Above right CaRa Smart Charger PLUS its 12-volt battery Right The SR Smart Charger/Cycler gelled-electrolyte battery its shoulder bag work charging airplane George Myerss granddaughter Heather Myers climbed van watch him set up CaRa charger/cycler maintain three airplanes three transmitters After have charged batteries CaRa Trickier can maintain up 40 battery packs full charge up 10 years Battery manufacturers consider 10 years shelf-life limit can always test what have see standing up use Trickier dont need recharge batteries once month Another product just sits doing its job CaRa RC System Automatic Cycler Charger somewhat special since can powered either 110 VAC 12 VDC constant-current charges four- five-cell receiver packs eight- nine-cell transmitter packs switch selected Charge cutoff voltage slope detection push test button dischargetests pack 300 mA 11 VDC recharges normal 1 200-mAh packs displaying measure charge capacity charger also has receiver transmitter trickle-charge outputs simultaneously maintain other charged packs went Alaska van during 1989 took care on-the-road battery charging needs fuss wasnt flying Electrics time though look back trip realize electric power would have better No problem obtaining storing fuel No oil drips fuel smell van slept Electrics ideal traveler CaRa recommends charger should returned third year just insure various calibrations remain correct $15 fee includes return shipping Periodic recalibration good thing calibrated equipment such narrow-band transmitter receiver regardless makes SOURCES 1 High TEK Models 510 Harlan NE Grand Rapids MI 49503 Tel 616 458-2261 NiMH batteries 2 Model Engineering Norwalk 54 Chestnut Hill Norwalk CT 06851 MEN C-SO Charger Ni-Cd NiMH batteries 3 SR Batteries PO Box 287 Bellport NY 11713 Tel 516 286-0079 fax 516 286-0901 SR Smart Charger/Cycler electric-power batteries 4 CaRa Products PO Box 221 Canton SD 57013 Tel 605 987-5924 CaRa Smart Charger PLUS gel cells other specialty chargers MAX FUEL Order Form CALL OR USE THI5 HANDY ORDER FORM TO SPEED YOUR ORDER FILL IN OTY ON THE LEFT THE TOTAL ON RIGHT Freight free qts gals No handling charge Freight collect drums Deduct 3% prepay Mix qty Total qty determines price SC orders add 5% sales tax Dealer club prices avail Accept credit cards checks COD COD add $450 per carton UPS shipments add $600 per carton hazardous materials fee OWFUELONE I4G8JCASE 24L60L1CAL orderedMIXTURE IGAL 5GALCAN PERGALPERGALPERGAL RED MAX PREMIUM FUEL fuel beginners & sport flyers should use Avail synthelk castor blend RED MAX 0102877175068961717365 RED MAX 5114585983676768722125 RED MAX 10129497094486777628140 RED MAX 121353101598890781230545 RED MAX 1514121059102194684732951 RED MAX RACING FUEL Trophy winner planes boats & cars two boat blends castor ok up 40% nilco RED MAX 201763132212871181105847148 RED MAX 251951146314241307117154774 RED MAX 402515188818381685150977604 RED MAX 502891216821101937173492824 RED MAX 60326724523852189196108044 RED MAX 6534552591252223152073115654 RED MAX 4-CYCLE FUEL Eliminates datonallon & kickback 4-cycle engines smoother idle power 10-4 CYCLE129497194588777728159 15-4 CYCLE14431082105396786634173 RED MAX HELICOPTER FUEL Extremely amooth running extra defoamer drk color special heavy oil fur helicptra 10 Helicopter132399396688779429342 ______ iSHelicopter1472 1104107498688335357 RED MAX PERFORMANCE FUEL High flash point heavy oil use tuned pipes ducted fan & other heavy dl app 5 Performance117588185878770523328 10 Performance 132399396688779429342 15 Performance 14721104107498688335357 RED MAX PATTERN FUEL Proven beat fuel paltem engines using pumps funed pipes 5 Pattern117588185878770523328 10 Paflem132399396688779429342 15 Paflem1472110410749868833535 SUPER TIGER 3000 FUEL Best fuel super Tiger 2000-4000 engines SuperTiger3000 128497094486777628140 RED MAX DIESEL FUEL SuperIor dIesel beck list popular demand cuato4llers BEARING TYPE BALL19081432139312791145 PLAIN20161540150113871253 CUSTOM BLENDED FUEL INGREDIENTS j2 Available type engine use Call price Mm gallon boats cam helicopters speed pattern scale scale kavun iginSion 3000 - - Pricas May Vary Power easy starting power smooth take offs power intricate maneuvers Red Max TOTAL $AMT makes ____ engine come alive power performance never expected can have power Its phone call away Power today next week next year Red Maxs secret gredients keep engine last ing longer running power fully other 100% money back guaran tee com pletely sat isfied reason Red Max has power better idle better wear char acteristics other fuel 62 Model Aviation AL DRUM PLEASE PRINT NAME CITY STATE ZIP cARD TYPE AND NA FYPIRATIAN flATE
Edition: Model Aviation - 1993/09
Page Numbers: 60, 61, 62
U George M Mye 3@ yL7L1J iJy aeu mu r mu t BATTERIES AND SOME GOOD OLD CHARGERS periodic table elements simple attended high school no manufactured elements radjoisotopes started work navy aircraft got interested galvanic series corrosion Batteries depend both lists can make battery out literally anything couple pieces metal some sea water will Super Batteries Triple Time Between Recharges reads headline Computer Shopper magazine seems AER Re search Atlanta Georgia has revived old zinc-air cell licensed technology make rechargeable 1-pound battery has offered notebook computer manufacturers Valence Technology San Jose California working lithium polymer cell also notebook computers thin-film device stage development say tolerates 150 deep-discharge cycles dont state current capacity Neither cells available right now can assume few things based what know computers First will low-voltage low-current batter ies designed discharge over three hours will have no immediate application Electric airplanes allow longer operating time same bulk might useful transmitters receivers new battery type has already appeared uses nickel metal hydride plates NiMH practical purposes can think nickel-cadmium battery double charge capacity cadmium goes landfill poisons drinking water NiMH batteries can purchased now extend operating time transmitters receivers increasing weight bulk used laptop computers portable telephones US vendor NiMH cells High TEK Models makes available AA cells 1100 mAh 24 grams $6 full C cells 35Ah 80 grams $13 designed one-hour discharge maximum rate 16-hour recharge will note batteries weigh half much comparable Ni-Cd cells Charging NiMH Batteries General purpose NiIvIH cells designed constant-current 16-hour charging C/l0 rate During over charge heat generated proportion rate overcharge Trickle charging less C/10 can maintained indefinitely According manufacturers literature NiMH cells can constructed 15-minute charging trick find someone has Temperature effects Fast charging requires temperature voltage control Depending charge rate temperature rise 50 100C absolute limit temperature 350 450C must observed voltage curve NiMH batteries similar Ni-Cd batteries dV/dt peak slope detection can used temperature range charging is00 400C discharging 10O 500C storage 20o 350C Armed information sailplaners people PCM systems instance should find combination NiMH batter ies MEN Model Engineering Norwalk charger very attractive small servos now used sailplanes consume current standard servos few years back NiMH batteries can have double energy capacity stan 111 Transition Low High Rate Complete Rapid Chwgang 4 900 00 dard 600-mAh pen cell pack increasing weight bulk SOME USEFUL CHARGERS 1 RC systems NiMil batteries An interesting thing has learned about charging NiMH AA cells old MEN charger see Radio Technique September 1980 issue Model Aviation seems good tool job because works sensing voltage tapers charge along recommended schedule NiMH batteries Im assuming dont save old magazines since might interested what said will include parts original MEN article have also added some new thoughts Briefly MEN C-504 pulse charger two outputs usually eight Ni-Cds four though other configurations available oscilloscope voltage waveform looks like half-wave rectified AC peak value 25 volts An SCR controls phase angle charger starts delivering current battery net effect charge starts pulses 3¼-amp current tapers down about 20 mA charger isnt delivering current measures battery voltage called valley sensing purpose controlling charge have left Trajectory High Charging Rate Magnitude High Rate Peak Above Battery Voltage Pro portional Battery Resistance Trajectory Low Charging Rate Voltage Battery Voltage Thu Monitored Charger observed output voltage characterIstIcs MEN charger dIrect-coupled oscIlloscope resulting caciliogram looks like sketch High Rate LED flickering Low Charging Rate trajectory used times betteryvoitage above preset cut off voltage 55 VOC 4-cell pack High Charging Rate trajectory uaed battery voltage below point transitIon moves 0 go degrees battery voltage rises 40 55 VOC High Rate charging ceases battery voltage above 55 VOC Annotated oscillogram showing MEN charger sends pulses Current battery Radio Technique ModelAviation September 1980 60 Model Aviation eries connected MEN charger months damage original MEN charger sensi tive spikes 110 VAC line put certain kinds electric motors used much energy conser vation reasons spikes could cause charger fail either full full off Semiconductors made better today problem rarely appeared rarer today Stability measuring circuit excellent cannot measure voltage cur rent MEN charger conventional AC/DC meters settling time digital meters too long never settle correct value Coil-type meters can damaged pulses panel-mount-type meter would damaged iron vane meter So unless have oscilloscope iron vane meter dont try Summarizing 1980 article clipped idle 500-mAh pack MEN After few minutes LED flickered went out discharged pack measured 300 mAh Repeated test LED went out 23 minutes Discharge test 300 mAh Back charger 16 hours Next day dis charged pack found 475 mAh Thinking might mistake charged pack again Flickering stopped 34 minutes 16 hours later pack discharged 475 mAh Cycling pack restored its capacity MEN charger no problem either its high-resistance idle state its low-resistance active state took another transmitter off shelf tested its pack rather typical history always recharged manufacturers 50-mA charger seen partial discharges service Capacity down 350 mAh candidate battery replacement Discharge two-hour rate followed 16-hour recharging MEN produced following results 350 375 400 400 mAli attached 10-ohm 10-watt resistor pack took way down 0 volts An eight-hour recharge MEN yielded test capacity 450 mAh might say routine saved battery scrap pile several MEN charger models dont know what voltage MEN set look serial number see numbers four eight cells see H old Kraft Sport series four five cells An 5 tells Cox/Sanwa four nine cells An X tells old Kraft Signature World Engines systems four 10 cells An R tells two 4-cell packs find letter dont want serial number MEN charger less 8200 dont junk charger would prudent send back MEN general cleaning and/or update simple change circuit eliminates problem discussed above Other simple modifications can change voltages what want will spend about $15 $30 half return postage get back like-new charger now lists $9495 2 electric-powered models RC systems NiMH batteries As mentioned July 92 issue MA use SR Smart Charger/Cycler electric-pow ered models expensive gets job done Accepting power either AC power supply car battery prefer red will charge two 28 cells time currents 100 mA five amps Three cutoffs active same time will stop fast-charging battery temperature rises lOT battery voltage peaks preset timer reaches its limit three cutoffs active fast-charging mode Since has devices should suitable charging NiMH batteries 3 12-volt gel cells CaRa 12 VDC Smart Charger PLUS accepts 110 VAC input power just sits blinking takes care 12-volt battery has done several years thing can wrong charger reverse connections battery have 17 amp-hour gel-cell intended burglar alarms use power SR Smart Charger/Cycler still use noisemakers might use start engines carry battery padded shoulder bag designed small video camera CaRa charger rides will ready needed about much weight am willing carry charges electric airplanes day long 4 Other chargers transmitters receivers RC systems stand idle lot like winter should use charger came set instructed least once per month will keep batteries healthy minimum cost September 1993 61 Above MEN Charger have ready use NiMH battery Above right CaRa Smart Charger PLUS its 12-volt battery Right The SR Smart Charger/Cycler gelled-electrolyte battery its shoulder bag work charging airplane George Myerss granddaughter Heather Myers climbed van watch him set up CaRa charger/cycler maintain three airplanes three transmitters After have charged batteries CaRa Trickier can maintain up 40 battery packs full charge up 10 years Battery manufacturers consider 10 years shelf-life limit can always test what have see standing up use Trickier dont need recharge batteries once month Another product just sits doing its job CaRa RC System Automatic Cycler Charger somewhat special since can powered either 110 VAC 12 VDC constant-current charges four- five-cell receiver packs eight- nine-cell transmitter packs switch selected Charge cutoff voltage slope detection push test button dischargetests pack 300 mA 11 VDC recharges normal 1 200-mAh packs displaying measure charge capacity charger also has receiver transmitter trickle-charge outputs simultaneously maintain other charged packs went Alaska van during 1989 took care on-the-road battery charging needs fuss wasnt flying Electrics time though look back trip realize electric power would have better No problem obtaining storing fuel No oil drips fuel smell van slept Electrics ideal traveler CaRa recommends charger should returned third year just insure various calibrations remain correct $15 fee includes return shipping Periodic recalibration good thing calibrated equipment such narrow-band transmitter receiver regardless makes SOURCES 1 High TEK Models 510 Harlan NE Grand Rapids MI 49503 Tel 616 458-2261 NiMH batteries 2 Model Engineering Norwalk 54 Chestnut Hill Norwalk CT 06851 MEN C-SO Charger Ni-Cd NiMH batteries 3 SR Batteries PO Box 287 Bellport NY 11713 Tel 516 286-0079 fax 516 286-0901 SR Smart Charger/Cycler electric-power batteries 4 CaRa Products PO Box 221 Canton SD 57013 Tel 605 987-5924 CaRa Smart Charger PLUS gel cells other specialty chargers MAX FUEL Order Form CALL OR USE THI5 HANDY ORDER FORM TO SPEED YOUR ORDER FILL IN OTY ON THE LEFT THE TOTAL ON RIGHT Freight free qts gals No handling charge Freight collect drums Deduct 3% prepay Mix qty Total qty determines price SC orders add 5% sales tax Dealer club prices avail Accept credit cards checks COD COD add $450 per carton UPS shipments add $600 per carton hazardous materials fee OWFUELONE I4G8JCASE 24L60L1CAL orderedMIXTURE IGAL 5GALCAN PERGALPERGALPERGAL RED MAX PREMIUM FUEL fuel beginners & sport flyers should use Avail synthelk castor blend RED MAX 0102877175068961717365 RED MAX 5114585983676768722125 RED MAX 10129497094486777628140 RED MAX 121353101598890781230545 RED MAX 1514121059102194684732951 RED MAX RACING FUEL Trophy winner planes boats & cars two boat blends castor ok up 40% nilco RED MAX 201763132212871181105847148 RED MAX 251951146314241307117154774 RED MAX 402515188818381685150977604 RED MAX 502891216821101937173492824 RED MAX 60326724523852189196108044 RED MAX 6534552591252223152073115654 RED MAX 4-CYCLE FUEL Eliminates datonallon & kickback 4-cycle engines smoother idle power 10-4 CYCLE129497194588777728159 15-4 CYCLE14431082105396786634173 RED MAX HELICOPTER FUEL Extremely amooth running extra defoamer drk color special heavy oil fur helicptra 10 Helicopter132399396688779429342 ______ iSHelicopter1472 1104107498688335357 RED MAX PERFORMANCE FUEL High flash point heavy oil use tuned pipes ducted fan & other heavy dl app 5 Performance117588185878770523328 10 Performance 132399396688779429342 15 Performance 14721104107498688335357 RED MAX PATTERN FUEL Proven beat fuel paltem engines using pumps funed pipes 5 Pattern117588185878770523328 10 Paflem132399396688779429342 15 Paflem1472110410749868833535 SUPER TIGER 3000 FUEL Best fuel super Tiger 2000-4000 engines SuperTiger3000 128497094486777628140 RED MAX DIESEL FUEL SuperIor dIesel beck list popular demand cuato4llers BEARING TYPE BALL19081432139312791145 PLAIN20161540150113871253 CUSTOM BLENDED FUEL INGREDIENTS j2 Available type engine use Call price Mm gallon boats cam helicopters speed pattern scale scale kavun iginSion 3000 - - Pricas May Vary Power easy starting power smooth take offs power intricate maneuvers Red Max TOTAL $AMT makes ____ engine come alive power performance never expected can have power Its phone call away Power today next week next year Red Maxs secret gredients keep engine last ing longer running power fully other 100% money back guaran tee com pletely sat isfied reason Red Max has power better idle better wear char acteristics other fuel 62 Model Aviation AL DRUM PLEASE PRINT NAME CITY STATE ZIP cARD TYPE AND NA FYPIRATIAN flATE
Edition: Model Aviation - 1993/09
Page Numbers: 60, 61, 62
U George M Mye 3@ yL7L1J iJy aeu mu r mu t BATTERIES AND SOME GOOD OLD CHARGERS periodic table elements simple attended high school no manufactured elements radjoisotopes started work navy aircraft got interested galvanic series corrosion Batteries depend both lists can make battery out literally anything couple pieces metal some sea water will Super Batteries Triple Time Between Recharges reads headline Computer Shopper magazine seems AER Re search Atlanta Georgia has revived old zinc-air cell licensed technology make rechargeable 1-pound battery has offered notebook computer manufacturers Valence Technology San Jose California working lithium polymer cell also notebook computers thin-film device stage development say tolerates 150 deep-discharge cycles dont state current capacity Neither cells available right now can assume few things based what know computers First will low-voltage low-current batter ies designed discharge over three hours will have no immediate application Electric airplanes allow longer operating time same bulk might useful transmitters receivers new battery type has already appeared uses nickel metal hydride plates NiMH practical purposes can think nickel-cadmium battery double charge capacity cadmium goes landfill poisons drinking water NiMH batteries can purchased now extend operating time transmitters receivers increasing weight bulk used laptop computers portable telephones US vendor NiMH cells High TEK Models makes available AA cells 1100 mAh 24 grams $6 full C cells 35Ah 80 grams $13 designed one-hour discharge maximum rate 16-hour recharge will note batteries weigh half much comparable Ni-Cd cells Charging NiMH Batteries General purpose NiIvIH cells designed constant-current 16-hour charging C/l0 rate During over charge heat generated proportion rate overcharge Trickle charging less C/10 can maintained indefinitely According manufacturers literature NiMH cells can constructed 15-minute charging trick find someone has Temperature effects Fast charging requires temperature voltage control Depending charge rate temperature rise 50 100C absolute limit temperature 350 450C must observed voltage curve NiMH batteries similar Ni-Cd batteries dV/dt peak slope detection can used temperature range charging is00 400C discharging 10O 500C storage 20o 350C Armed information sailplaners people PCM systems instance should find combination NiMH batter ies MEN Model Engineering Norwalk charger very attractive small servos now used sailplanes consume current standard servos few years back NiMH batteries can have double energy capacity stan 111 Transition Low High Rate Complete Rapid Chwgang 4 900 00 dard 600-mAh pen cell pack increasing weight bulk SOME USEFUL CHARGERS 1 RC systems NiMil batteries An interesting thing has learned about charging NiMH AA cells old MEN charger see Radio Technique September 1980 issue Model Aviation seems good tool job because works sensing voltage tapers charge along recommended schedule NiMH batteries Im assuming dont save old magazines since might interested what said will include parts original MEN article have also added some new thoughts Briefly MEN C-504 pulse charger two outputs usually eight Ni-Cds four though other configurations available oscilloscope voltage waveform looks like half-wave rectified AC peak value 25 volts An SCR controls phase angle charger starts delivering current battery net effect charge starts pulses 3¼-amp current tapers down about 20 mA charger isnt delivering current measures battery voltage called valley sensing purpose controlling charge have left Trajectory High Charging Rate Magnitude High Rate Peak Above Battery Voltage Pro portional Battery Resistance Trajectory Low Charging Rate Voltage Battery Voltage Thu Monitored Charger observed output voltage characterIstIcs MEN charger dIrect-coupled oscIlloscope resulting caciliogram looks like sketch High Rate LED flickering Low Charging Rate trajectory used times betteryvoitage above preset cut off voltage 55 VOC 4-cell pack High Charging Rate trajectory uaed battery voltage below point transitIon moves 0 go degrees battery voltage rises 40 55 VOC High Rate charging ceases battery voltage above 55 VOC Annotated oscillogram showing MEN charger sends pulses Current battery Radio Technique ModelAviation September 1980 60 Model Aviation eries connected MEN charger months damage original MEN charger sensi tive spikes 110 VAC line put certain kinds electric motors used much energy conser vation reasons spikes could cause charger fail either full full off Semiconductors made better today problem rarely appeared rarer today Stability measuring circuit excellent cannot measure voltage cur rent MEN charger conventional AC/DC meters settling time digital meters too long never settle correct value Coil-type meters can damaged pulses panel-mount-type meter would damaged iron vane meter So unless have oscilloscope iron vane meter dont try Summarizing 1980 article clipped idle 500-mAh pack MEN After few minutes LED flickered went out discharged pack measured 300 mAh Repeated test LED went out 23 minutes Discharge test 300 mAh Back charger 16 hours Next day dis charged pack found 475 mAh Thinking might mistake charged pack again Flickering stopped 34 minutes 16 hours later pack discharged 475 mAh Cycling pack restored its capacity MEN charger no problem either its high-resistance idle state its low-resistance active state took another transmitter off shelf tested its pack rather typical history always recharged manufacturers 50-mA charger seen partial discharges service Capacity down 350 mAh candidate battery replacement Discharge two-hour rate followed 16-hour recharging MEN produced following results 350 375 400 400 mAli attached 10-ohm 10-watt resistor pack took way down 0 volts An eight-hour recharge MEN yielded test capacity 450 mAh might say routine saved battery scrap pile several MEN charger models dont know what voltage MEN set look serial number see numbers four eight cells see H old Kraft Sport series four five cells An 5 tells Cox/Sanwa four nine cells An X tells old Kraft Signature World Engines systems four 10 cells An R tells two 4-cell packs find letter dont want serial number MEN charger less 8200 dont junk charger would prudent send back MEN general cleaning and/or update simple change circuit eliminates problem discussed above Other simple modifications can change voltages what want will spend about $15 $30 half return postage get back like-new charger now lists $9495 2 electric-powered models RC systems NiMH batteries As mentioned July 92 issue MA use SR Smart Charger/Cycler electric-pow ered models expensive gets job done Accepting power either AC power supply car battery prefer red will charge two 28 cells time currents 100 mA five amps Three cutoffs active same time will stop fast-charging battery temperature rises lOT battery voltage peaks preset timer reaches its limit three cutoffs active fast-charging mode Since has devices should suitable charging NiMH batteries 3 12-volt gel cells CaRa 12 VDC Smart Charger PLUS accepts 110 VAC input power just sits blinking takes care 12-volt battery has done several years thing can wrong charger reverse connections battery have 17 amp-hour gel-cell intended burglar alarms use power SR Smart Charger/Cycler still use noisemakers might use start engines carry battery padded shoulder bag designed small video camera CaRa charger rides will ready needed about much weight am willing carry charges electric airplanes day long 4 Other chargers transmitters receivers RC systems stand idle lot like winter should use charger came set instructed least once per month will keep batteries healthy minimum cost September 1993 61 Above MEN Charger have ready use NiMH battery Above right CaRa Smart Charger PLUS its 12-volt battery Right The SR Smart Charger/Cycler gelled-electrolyte battery its shoulder bag work charging airplane George Myerss granddaughter Heather Myers climbed van watch him set up CaRa charger/cycler maintain three airplanes three transmitters After have charged batteries CaRa Trickier can maintain up 40 battery packs full charge up 10 years Battery manufacturers consider 10 years shelf-life limit can always test what have see standing up use Trickier dont need recharge batteries once month Another product just sits doing its job CaRa RC System Automatic Cycler Charger somewhat special since can powered either 110 VAC 12 VDC constant-current charges four- five-cell receiver packs eight- nine-cell transmitter packs switch selected Charge cutoff voltage slope detection push test button dischargetests pack 300 mA 11 VDC recharges normal 1 200-mAh packs displaying measure charge capacity charger also has receiver transmitter trickle-charge outputs simultaneously maintain other charged packs went Alaska van during 1989 took care on-the-road battery charging needs fuss wasnt flying Electrics time though look back trip realize electric power would have better No problem obtaining storing fuel No oil drips fuel smell van slept Electrics ideal traveler CaRa recommends charger should returned third year just insure various calibrations remain correct $15 fee includes return shipping Periodic recalibration good thing calibrated equipment such narrow-band transmitter receiver regardless makes SOURCES 1 High TEK Models 510 Harlan NE Grand Rapids MI 49503 Tel 616 458-2261 NiMH batteries 2 Model Engineering Norwalk 54 Chestnut Hill Norwalk CT 06851 MEN C-SO Charger Ni-Cd NiMH batteries 3 SR Batteries PO Box 287 Bellport NY 11713 Tel 516 286-0079 fax 516 286-0901 SR Smart Charger/Cycler electric-power batteries 4 CaRa Products PO Box 221 Canton SD 57013 Tel 605 987-5924 CaRa Smart Charger PLUS gel cells other specialty chargers MAX FUEL Order Form CALL OR USE THI5 HANDY ORDER FORM TO SPEED YOUR ORDER FILL IN OTY ON THE LEFT THE TOTAL ON RIGHT Freight free qts gals No handling charge Freight collect drums Deduct 3% prepay Mix qty Total qty determines price SC orders add 5% sales tax Dealer club prices avail Accept credit cards checks COD COD add $450 per carton UPS shipments add $600 per carton hazardous materials fee OWFUELONE I4G8JCASE 24L60L1CAL orderedMIXTURE IGAL 5GALCAN PERGALPERGALPERGAL RED MAX PREMIUM FUEL fuel beginners & sport flyers should use Avail synthelk castor blend RED MAX 0102877175068961717365 RED MAX 5114585983676768722125 RED MAX 10129497094486777628140 RED MAX 121353101598890781230545 RED MAX 1514121059102194684732951 RED MAX RACING FUEL Trophy winner planes boats & cars two boat blends castor ok up 40% nilco RED MAX 201763132212871181105847148 RED MAX 251951146314241307117154774 RED MAX 402515188818381685150977604 RED MAX 502891216821101937173492824 RED MAX 60326724523852189196108044 RED MAX 6534552591252223152073115654 RED MAX 4-CYCLE FUEL Eliminates datonallon & kickback 4-cycle engines smoother idle power 10-4 CYCLE129497194588777728159 15-4 CYCLE14431082105396786634173 RED MAX HELICOPTER FUEL Extremely amooth running extra defoamer drk color special heavy oil fur helicptra 10 Helicopter132399396688779429342 ______ iSHelicopter1472 1104107498688335357 RED MAX PERFORMANCE FUEL High flash point heavy oil use tuned pipes ducted fan & other heavy dl app 5 Performance117588185878770523328 10 Performance 132399396688779429342 15 Performance 14721104107498688335357 RED MAX PATTERN FUEL Proven beat fuel paltem engines using pumps funed pipes 5 Pattern117588185878770523328 10 Paflem132399396688779429342 15 Paflem1472110410749868833535 SUPER TIGER 3000 FUEL Best fuel super Tiger 2000-4000 engines SuperTiger3000 128497094486777628140 RED MAX DIESEL FUEL SuperIor dIesel beck list popular demand cuato4llers BEARING TYPE BALL19081432139312791145 PLAIN20161540150113871253 CUSTOM BLENDED FUEL INGREDIENTS j2 Available type engine use Call price Mm gallon boats cam helicopters speed pattern scale scale kavun iginSion 3000 - - Pricas May Vary Power easy starting power smooth take offs power intricate maneuvers Red Max TOTAL $AMT makes ____ engine come alive power performance never expected can have power Its phone call away Power today next week next year Red Maxs secret gredients keep engine last ing longer running power fully other 100% money back guaran tee com pletely sat isfied reason Red Max has power better idle better wear char acteristics other fuel 62 Model Aviation AL DRUM PLEASE PRINT NAME CITY STATE ZIP cARD TYPE AND NA FYPIRATIAN flATE