George Nt Myers THE MAN says its time talk about charging batteries again goes Ill try put few new items just wont bore have heard fore should obvious people use charger came RC sys tem according instruction packed box really dont need additional information So wheres problem two basic types problems first type impatience forget charge batteries until ready go flying decide need Quick Fast Rapid charger buy worry have done right thing buy flight pack batteries rated differently pack came system need some way know whether or charge system charger Corollary situation need new charger can charge everything once Fig 1 shows representative collection chargers have acquired used over years Beginning oclock position reading clockwise see KF Uni-charger ca 1960 basically model railroad transformer rectifier meter two ranges 0125ma constant-current charging small batteries 0-125 amps unreg ulated charging motorcycle batteries like Pro-line simultaneous charger two 48 VDC packs transmitter 48VDC pack receiver battery eliminator pocket calculator has fitted adapter permit charging 450-maH flight pack Since charger has no pilot light adapter includes LED purpose Cannon charger simultaneous charging 96 VDC transmitter 225-maH 48VDC receiver pack An adapter made two Deans connec tors resistor facilitate charging l00-maH flight pack Cox/Sanwa charger simultane ously charging 108 VDC transmitter pack 450-maH 48VDC receiver pack Note looks like Cannon charger actually quite different 9 oclock position An Ace R/C Inc metered van-charger unit provides constant-current source adjustable lOOmaH batteries I5VDC cute part device LED glows connect pack correctly before turning charger will glow backwards especially nice because meter indicates current going out re gardless have connected pack being charged typical metered chargers general Astro-Flight Inc R/C System Analyzer & Rapid Charger unit capable doing battery pack discharge test 10 minutes recharging pack completely 30 minutes use recom mend unit explains extra switch middle panel pack adapters above im portant features unit meter mechanical clock/switch may forget clock wont center display Kraft Fast Charger ca 1972 fig ured embarassment some wellknown fliers recently used according instructions came charger works exactly should point above descriptions units serves useful purpose no such thing best charger best way charge batteries hope answers some letters have received request plans best unit doubt use came system fol low instructions Before proceeding circuitry should state couple definitions charging battery cause chemical changes within cell permit give back electrical current period time dimensions capacity C work stored battery cells ordinarily used RC systems defined milli amperes X hours maH Note capacity capacitance -measure properties condenser also marked C battery charger used charge battery battery pack charger gives current battery order relate properties charger properties battery measure charging current compare cur rent battery rated yield hours Therefore find common RC system batteries rated 45OmaH usual charger puts about 45 ma charger rated C/b charger 45ma a get 10 Connected single cell charger may March 1978 13 An assortment specialpurpose battery chargers See text descriptions Knowing condition battery pack proper charging dependability saves airplane COPP2R UJIE.P lD%fSlD COIJTACT 30 BATTERY 0 Schematic diagram adapter Pick Ri 20 ma through LED Pick R2 bypass additional current batteries being charged asfound necessary yield entirely different current say SOma situation charger would rated C/3 charger because would putting full charge hour materials used construct nickle cadmium cells same manu facturers properties cell chemistry during charging cell liberates oxygen gas discharged cell being charged chemistry can take care gas fast forms However cell fully charged being driven overcharged condition charging rate becomes very important C/l0 rate cell can tol erate lot overcharging usually 200% Therefore customarily call 50% overcharge manufac turers call 14 16 hours charging forget disconnect youve got least another day remember C/10 charging tolerant mistakes C/3 charging case chemistry cant keep up gas pres sure within cell rises overcharging continues 100% pressure gets high enough open vent cell gas escapes taking some cells original capacity Repeated over charging C/3 rate can damage cell need automatic shutoff some way know what state charge start way operate Fast charger always discharge cells 11 volts per cell level before Fast charging can put back 120% rated charge reasonably certain having fully charged cell Higher rates charging up bC possible sensitivity overcharg ing penalties neglect become much serious lOC rate over charged cell may actually explode Highrate charging no worse C/l0 charg ing less tolerant error Fig 2 shows AFI charger ready charge Cox/Sanwa transmitter have problem Cox/Sanwa transmit ter contains nine nickle-cadmium batter ies instead usual 8 full charge pack shows us about 13 VDC car motorcycle battery shows I2VDC cant get charge way ad dition AFI charger contains diode prevent us fast charging reverse diode drops about 08 VDC engineers Sanwa also installed diode charging jack avoid accidental short circuiting exposed pin drops another 08 VDC So need totalof 13 146VDCtodothejob automobile engine running see about 135 VDC cigar lighter leaves us 11 VDC short mentioned Bob Boucher Astro Flight Inc said make adapter * will put battery two series Rapid charger did worked meter Rapid charger reads charger its finished beCon tinued page 8S 14 Model Aviation out-up rut urcring .uat catuwa iarr,ciurarm nr Rapid Chargerpruuau urrru over what doing working batteries will reward comfort W OUTSIDE CONTACT SILVER WIRE - Schematic diagram AFI/Cox/Sanwa Rapid Charging setup simple adapter makes - ERYT V Letters Editor continued page 60 States Air Force have building flying models since age 13 am enclosing picture planes built flown 1957 Richard Gardner Ft Worth TX AMA has sent Mr Gardner Club Kit Rule Book Membership Applica tion materials free anyone terested joining AMA Take Bow Walt would like take opportunity thank Walt Schoonard excellent column helicopters Model via tion magazine Im sure others will agree Walt has added greatly knowledge interested radio con trol helicopters has made sug gestions improving performance safety helicopters enjoy fly ing much Thank Walt Roger WMay College Place WA CORRECTION delighted presentation article About Size following errata captions describing photos did write reference triple redundant photographers camera required nail down critical spray peaks three dimensions three cameras indeed neces sary Skate model suspended rig balsa metal being carried rig mounted launch about 20 feet long fitted out purpose test being run Estuary small inlet San Diego Bay first paragraph page 11 sev eral places Time t expressed KS should read K Bradford Powers Schoolwork Fun/Warner continued page 12 ing site crashing least plane trying hard enough crash learning takes place stress need carefully ob serve flight Knowing whether plane crashed right spiral left spiral makes world difference what cor rective action take Hypothesize what caused problem test hypothesis making corrections before flying again repeat process try have ask watch first flights successive ones plane doing what should second-opinion method planes get flying better better last session inviting parents come out watch Results really impressive especially about 1000 am thermals start cooking off black-top return classroom critique after session go over common problems Some hardware have built class includes 1/4-hp wind machine demonstrating lift/drag control surfaces spiral propwash demonstrator prop unhooked model able turn freely its longitudinal axis moment-arm balance scale couple blow-between balls toilet-paper tube goodies Bernoulli effect old spooland-card trick thrust-measuring device show relationships between different props different size motors cansmash gallon can steam ping pong ball hair-dryer airstream lots flying demonstrators mentioned earlier product review product review product review ACE 25th Anniversary Catalogue over quarter centry ago Paul Runge founder proprietor ACEalong son Tom re cently Air Forcewas flying RC found like rest pioneer fliers parts almost impossible get Radio Shack Boston Commonplace items components could found big radio sup ply stores day requiring nationwide search such essentials National Coil Forms 3A4 3D6 tubes magnet wire Realizing others sharing problems Runge founded ACE R/C first small ad appearing May 1953 issue Air Trails first catalogue 2-sheet affair printed spirit duplicator new 72-pg ACE catalogue still offers hard-to-get parts also covers kits parts assembly modern reliable gear Contain ing vast array items catalogue costs $100 add 50c first class mail returnl $100 catalogue refundable first order ACE R/C Box 511G Higgins yule MO 64037 product review product review product review Such program can put together almost anywhere form another reasons succeeds well due support California Mu seum Foundation Gerry Richer Summer Science Workshop director give pretty much free hand plan class provide financial moral help Teachers picked because nuts about what doing love job well cant imagine someone being assigned teach class like As other kinds help lots super people will help people like Bill Hannan Art Guenther Tony Naccarato Frank Zaic over country Ask owe great deal model aviation passing some fun kids program can start repaying sides else can get paid playing toy airplanes Sources Supply Helium welding supply store LA 245 cuft bottle costs $35 gas wsth $70 deposit $390/mo rental balloon filler buy $28 Balloons California Toytime Balloon Co 1116 West 7th St San Pedro CA has Zeppelin balloons gross gross regular round balloons about $30 both JASCO X-18 JASCO Box 135 North ridge CA 91324 Ask fleet rate catalog Frank Zaic has other beginners kits too X-18 queen line has rubber too Sleek Streeks almost dime stores toy dealers no luck try manufacturer North Pacific Products Bend Oregon Retail late 1977 $59 ea have two kinds balsa styrofoam wing Take balsa Rubber winders Sterling Models 3620 GSt Philadelphia PA 19134 Brochure Summer Science Workshop winter Exploring Science Sat urdays program teach abridged version Aeroplanes Flying Ma chines class call Uncle Bills Fly ing Circus Available ESS/SSW California State Museum Science Industry 700 State Drive Los Angeles CA 90037 RC Technique/Myers continued page 14 fore brought out separate lead purpose may prefer adapter important thing remember positive lead Rapid charger con nects negative terminal exter nal battery Ive sketched out Fig 3 Fig 4 gives close look metered van-charger available kit ACE R/C Inc Box 511 Higgins ville MO 64037 son Tim 14 years old built about hour unit has MarCh1978 85 KA Jill 1$ ACE l/ inc 90X56W 9HS KGGNSV E MO 6403 99] [Au 111331 BOX 511E HIGGINSVILLE MO 64037 SERVICE TO THE R/C MODELER FORA 91 TER OF CENTURY Send revised 1978 catalog $1 Add $ 50 1st Class return Add $1 handling other orders uses including power supply small experimental circuts can rejuvenate flashlight batteries Use 3Oma until cell voltage reaches 1 5VDC again pen-cell battery box shown attached used purpose Fig 5 shows calculator charger box on-the-wall type simple adapter built pill bottle Fig 6 schematic Deans connector adapter reminds must very careful label adapters chargers Several manufacturers use Deans connectors Cit izenship Pro-Line ACE R/C Can non come mind immediately dont use pins same purposes Use voltmeter check out before turn charger perhaps some damage Ive confused please read col writing advertisers mention read about MA umn again Ive tried keep things simple possibleno chemistry no math just facts Ive tried show Rapid Charging safe used intelligence Examples shown demonstrate shouldnt play mixand-match components various manufacturers checking first see what Charger ratings ex plained help choose what need good general-purpose charger identified should prepared decision Happy Flying Keep cards letters coming Im very far behind right now expect catch up now winter has set Windlord/Bates continued page 20 adjusting CG small increments until stable floating glide achieved setting Towing accomplished bridle shown Figure E tie bridle snap swivel Pass through ring snap-swivel use large enough tow rings cannot pass through side bridle ring will stop snap swivel allow com plete tow One-side tows possible requiring about 100 rudder deflection correct yaw may substitute conventional hooks releasable capture hooks may necessary launching winch continuously pulse winch rapidly through early portion tow cluding tensioning line launch will maintain constant tension tow like hi-start run winch continuously until ship has - started rotate climb sud denly release pressure line may experience slight pitch up releasing tow bridle Efficient thermaling turns can made quite tightly penetration down elevator trim excellent Inverted flight almost good upright Windlord can made outside loop verted rudder does reverse Right still right Dont ask Dethermaliz ing done flaps shallow verted dive since upright dive builds speed rapidly speed does bleed off quickly Orientation has problem looks much like hawk distance dont recommend using dark color scheme Enjoy Windlord dont lose gaggle hawks RC Aerobatks/VanPutte continued page 21 very familiar necessity coordi nate application aileron rudder attempts roll light aircraft using aileron nose will generally yaw wrong direction before rolls Some airplanes like J-3 Cub will end up skid wing barely higher other important fact adverse yaw causes nose airplane move lat erally opposite direction roll before airplane really begins rol ling Consequently roll begun aircraft yawed condition what makes axial roll look bad Aile ron differential helps make axial rolls look better reducing initial adverse yaw other sources yaw roll require air plane must rolling order generate yawing moment causes yaw 86 Model Aviation FAMOUS BRITISH DIESELS DIC RAW * *NEWr * EATA LOG-DIESEL HANDBOOK $150 pp HOBBY H IDEAWAY DELAVMqILLe17a4 MORRISONSCALE DRAWINGS REPLA-TECH ntrfltIOfl@I CATALOG 25c vs 48500 McKenzie Hwy Vids Oregon 97488 George M Myers 70 Froehlich Farm Road Hicksville NY 11801 ACE R/C Inc metered van-charger can solve miscellaneous charging prob lems has handy indicator warn you should accidentaly connect backwards
Edition: Model Aviation - 1978/03
Page Numbers: 13, 14, 85, 86
George Nt Myers THE MAN says its time talk about charging batteries again goes Ill try put few new items just wont bore have heard fore should obvious people use charger came RC sys tem according instruction packed box really dont need additional information So wheres problem two basic types problems first type impatience forget charge batteries until ready go flying decide need Quick Fast Rapid charger buy worry have done right thing buy flight pack batteries rated differently pack came system need some way know whether or charge system charger Corollary situation need new charger can charge everything once Fig 1 shows representative collection chargers have acquired used over years Beginning oclock position reading clockwise see KF Uni-charger ca 1960 basically model railroad transformer rectifier meter two ranges 0125ma constant-current charging small batteries 0-125 amps unreg ulated charging motorcycle batteries like Pro-line simultaneous charger two 48 VDC packs transmitter 48VDC pack receiver battery eliminator pocket calculator has fitted adapter permit charging 450-maH flight pack Since charger has no pilot light adapter includes LED purpose Cannon charger simultaneous charging 96 VDC transmitter 225-maH 48VDC receiver pack An adapter made two Deans connec tors resistor facilitate charging l00-maH flight pack Cox/Sanwa charger simultane ously charging 108 VDC transmitter pack 450-maH 48VDC receiver pack Note looks like Cannon charger actually quite different 9 oclock position An Ace R/C Inc metered van-charger unit provides constant-current source adjustable lOOmaH batteries I5VDC cute part device LED glows connect pack correctly before turning charger will glow backwards especially nice because meter indicates current going out re gardless have connected pack being charged typical metered chargers general Astro-Flight Inc R/C System Analyzer & Rapid Charger unit capable doing battery pack discharge test 10 minutes recharging pack completely 30 minutes use recom mend unit explains extra switch middle panel pack adapters above im portant features unit meter mechanical clock/switch may forget clock wont center display Kraft Fast Charger ca 1972 fig ured embarassment some wellknown fliers recently used according instructions came charger works exactly should point above descriptions units serves useful purpose no such thing best charger best way charge batteries hope answers some letters have received request plans best unit doubt use came system fol low instructions Before proceeding circuitry should state couple definitions charging battery cause chemical changes within cell permit give back electrical current period time dimensions capacity C work stored battery cells ordinarily used RC systems defined milli amperes X hours maH Note capacity capacitance -measure properties condenser also marked C battery charger used charge battery battery pack charger gives current battery order relate properties charger properties battery measure charging current compare cur rent battery rated yield hours Therefore find common RC system batteries rated 45OmaH usual charger puts about 45 ma charger rated C/b charger 45ma a get 10 Connected single cell charger may March 1978 13 An assortment specialpurpose battery chargers See text descriptions Knowing condition battery pack proper charging dependability saves airplane COPP2R UJIE.P lD%fSlD COIJTACT 30 BATTERY 0 Schematic diagram adapter Pick Ri 20 ma through LED Pick R2 bypass additional current batteries being charged asfound necessary yield entirely different current say SOma situation charger would rated C/3 charger because would putting full charge hour materials used construct nickle cadmium cells same manu facturers properties cell chemistry during charging cell liberates oxygen gas discharged cell being charged chemistry can take care gas fast forms However cell fully charged being driven overcharged condition charging rate becomes very important C/l0 rate cell can tol erate lot overcharging usually 200% Therefore customarily call 50% overcharge manufac turers call 14 16 hours charging forget disconnect youve got least another day remember C/10 charging tolerant mistakes C/3 charging case chemistry cant keep up gas pres sure within cell rises overcharging continues 100% pressure gets high enough open vent cell gas escapes taking some cells original capacity Repeated over charging C/3 rate can damage cell need automatic shutoff some way know what state charge start way operate Fast charger always discharge cells 11 volts per cell level before Fast charging can put back 120% rated charge reasonably certain having fully charged cell Higher rates charging up bC possible sensitivity overcharg ing penalties neglect become much serious lOC rate over charged cell may actually explode Highrate charging no worse C/l0 charg ing less tolerant error Fig 2 shows AFI charger ready charge Cox/Sanwa transmitter have problem Cox/Sanwa transmit ter contains nine nickle-cadmium batter ies instead usual 8 full charge pack shows us about 13 VDC car motorcycle battery shows I2VDC cant get charge way ad dition AFI charger contains diode prevent us fast charging reverse diode drops about 08 VDC engineers Sanwa also installed diode charging jack avoid accidental short circuiting exposed pin drops another 08 VDC So need totalof 13 146VDCtodothejob automobile engine running see about 135 VDC cigar lighter leaves us 11 VDC short mentioned Bob Boucher Astro Flight Inc said make adapter * will put battery two series Rapid charger did worked meter Rapid charger reads charger its finished beCon tinued page 8S 14 Model Aviation out-up rut urcring .uat catuwa iarr,ciurarm nr Rapid Chargerpruuau urrru over what doing working batteries will reward comfort W OUTSIDE CONTACT SILVER WIRE - Schematic diagram AFI/Cox/Sanwa Rapid Charging setup simple adapter makes - ERYT V Letters Editor continued page 60 States Air Force have building flying models since age 13 am enclosing picture planes built flown 1957 Richard Gardner Ft Worth TX AMA has sent Mr Gardner Club Kit Rule Book Membership Applica tion materials free anyone terested joining AMA Take Bow Walt would like take opportunity thank Walt Schoonard excellent column helicopters Model via tion magazine Im sure others will agree Walt has added greatly knowledge interested radio con trol helicopters has made sug gestions improving performance safety helicopters enjoy fly ing much Thank Walt Roger WMay College Place WA CORRECTION delighted presentation article About Size following errata captions describing photos did write reference triple redundant photographers camera required nail down critical spray peaks three dimensions three cameras indeed neces sary Skate model suspended rig balsa metal being carried rig mounted launch about 20 feet long fitted out purpose test being run Estuary small inlet San Diego Bay first paragraph page 11 sev eral places Time t expressed KS should read K Bradford Powers Schoolwork Fun/Warner continued page 12 ing site crashing least plane trying hard enough crash learning takes place stress need carefully ob serve flight Knowing whether plane crashed right spiral left spiral makes world difference what cor rective action take Hypothesize what caused problem test hypothesis making corrections before flying again repeat process try have ask watch first flights successive ones plane doing what should second-opinion method planes get flying better better last session inviting parents come out watch Results really impressive especially about 1000 am thermals start cooking off black-top return classroom critique after session go over common problems Some hardware have built class includes 1/4-hp wind machine demonstrating lift/drag control surfaces spiral propwash demonstrator prop unhooked model able turn freely its longitudinal axis moment-arm balance scale couple blow-between balls toilet-paper tube goodies Bernoulli effect old spooland-card trick thrust-measuring device show relationships between different props different size motors cansmash gallon can steam ping pong ball hair-dryer airstream lots flying demonstrators mentioned earlier product review product review product review ACE 25th Anniversary Catalogue over quarter centry ago Paul Runge founder proprietor ACEalong son Tom re cently Air Forcewas flying RC found like rest pioneer fliers parts almost impossible get Radio Shack Boston Commonplace items components could found big radio sup ply stores day requiring nationwide search such essentials National Coil Forms 3A4 3D6 tubes magnet wire Realizing others sharing problems Runge founded ACE R/C first small ad appearing May 1953 issue Air Trails first catalogue 2-sheet affair printed spirit duplicator new 72-pg ACE catalogue still offers hard-to-get parts also covers kits parts assembly modern reliable gear Contain ing vast array items catalogue costs $100 add 50c first class mail returnl $100 catalogue refundable first order ACE R/C Box 511G Higgins yule MO 64037 product review product review product review Such program can put together almost anywhere form another reasons succeeds well due support California Mu seum Foundation Gerry Richer Summer Science Workshop director give pretty much free hand plan class provide financial moral help Teachers picked because nuts about what doing love job well cant imagine someone being assigned teach class like As other kinds help lots super people will help people like Bill Hannan Art Guenther Tony Naccarato Frank Zaic over country Ask owe great deal model aviation passing some fun kids program can start repaying sides else can get paid playing toy airplanes Sources Supply Helium welding supply store LA 245 cuft bottle costs $35 gas wsth $70 deposit $390/mo rental balloon filler buy $28 Balloons California Toytime Balloon Co 1116 West 7th St San Pedro CA has Zeppelin balloons gross gross regular round balloons about $30 both JASCO X-18 JASCO Box 135 North ridge CA 91324 Ask fleet rate catalog Frank Zaic has other beginners kits too X-18 queen line has rubber too Sleek Streeks almost dime stores toy dealers no luck try manufacturer North Pacific Products Bend Oregon Retail late 1977 $59 ea have two kinds balsa styrofoam wing Take balsa Rubber winders Sterling Models 3620 GSt Philadelphia PA 19134 Brochure Summer Science Workshop winter Exploring Science Sat urdays program teach abridged version Aeroplanes Flying Ma chines class call Uncle Bills Fly ing Circus Available ESS/SSW California State Museum Science Industry 700 State Drive Los Angeles CA 90037 RC Technique/Myers continued page 14 fore brought out separate lead purpose may prefer adapter important thing remember positive lead Rapid charger con nects negative terminal exter nal battery Ive sketched out Fig 3 Fig 4 gives close look metered van-charger available kit ACE R/C Inc Box 511 Higgins ville MO 64037 son Tim 14 years old built about hour unit has MarCh1978 85 KA Jill 1$ ACE l/ inc 90X56W 9HS KGGNSV E MO 6403 99] [Au 111331 BOX 511E HIGGINSVILLE MO 64037 SERVICE TO THE R/C MODELER FORA 91 TER OF CENTURY Send revised 1978 catalog $1 Add $ 50 1st Class return Add $1 handling other orders uses including power supply small experimental circuts can rejuvenate flashlight batteries Use 3Oma until cell voltage reaches 1 5VDC again pen-cell battery box shown attached used purpose Fig 5 shows calculator charger box on-the-wall type simple adapter built pill bottle Fig 6 schematic Deans connector adapter reminds must very careful label adapters chargers Several manufacturers use Deans connectors Cit izenship Pro-Line ACE R/C Can non come mind immediately dont use pins same purposes Use voltmeter check out before turn charger perhaps some damage Ive confused please read col writing advertisers mention read about MA umn again Ive tried keep things simple possibleno chemistry no math just facts Ive tried show Rapid Charging safe used intelligence Examples shown demonstrate shouldnt play mixand-match components various manufacturers checking first see what Charger ratings ex plained help choose what need good general-purpose charger identified should prepared decision Happy Flying Keep cards letters coming Im very far behind right now expect catch up now winter has set Windlord/Bates continued page 20 adjusting CG small increments until stable floating glide achieved setting Towing accomplished bridle shown Figure E tie bridle snap swivel Pass through ring snap-swivel use large enough tow rings cannot pass through side bridle ring will stop snap swivel allow com plete tow One-side tows possible requiring about 100 rudder deflection correct yaw may substitute conventional hooks releasable capture hooks may necessary launching winch continuously pulse winch rapidly through early portion tow cluding tensioning line launch will maintain constant tension tow like hi-start run winch continuously until ship has - started rotate climb sud denly release pressure line may experience slight pitch up releasing tow bridle Efficient thermaling turns can made quite tightly penetration down elevator trim excellent Inverted flight almost good upright Windlord can made outside loop verted rudder does reverse Right still right Dont ask Dethermaliz ing done flaps shallow verted dive since upright dive builds speed rapidly speed does bleed off quickly Orientation has problem looks much like hawk distance dont recommend using dark color scheme Enjoy Windlord dont lose gaggle hawks RC Aerobatks/VanPutte continued page 21 very familiar necessity coordi nate application aileron rudder attempts roll light aircraft using aileron nose will generally yaw wrong direction before rolls Some airplanes like J-3 Cub will end up skid wing barely higher other important fact adverse yaw causes nose airplane move lat erally opposite direction roll before airplane really begins rol ling Consequently roll begun aircraft yawed condition what makes axial roll look bad Aile ron differential helps make axial rolls look better reducing initial adverse yaw other sources yaw roll require air plane must rolling order generate yawing moment causes yaw 86 Model Aviation FAMOUS BRITISH DIESELS DIC RAW * *NEWr * EATA LOG-DIESEL HANDBOOK $150 pp HOBBY H IDEAWAY DELAVMqILLe17a4 MORRISONSCALE DRAWINGS REPLA-TECH ntrfltIOfl@I CATALOG 25c vs 48500 McKenzie Hwy Vids Oregon 97488 George M Myers 70 Froehlich Farm Road Hicksville NY 11801 ACE R/C Inc metered van-charger can solve miscellaneous charging prob lems has handy indicator warn you should accidentaly connect backwards
Edition: Model Aviation - 1978/03
Page Numbers: 13, 14, 85, 86
George Nt Myers THE MAN says its time talk about charging batteries again goes Ill try put few new items just wont bore have heard fore should obvious people use charger came RC sys tem according instruction packed box really dont need additional information So wheres problem two basic types problems first type impatience forget charge batteries until ready go flying decide need Quick Fast Rapid charger buy worry have done right thing buy flight pack batteries rated differently pack came system need some way know whether or charge system charger Corollary situation need new charger can charge everything once Fig 1 shows representative collection chargers have acquired used over years Beginning oclock position reading clockwise see KF Uni-charger ca 1960 basically model railroad transformer rectifier meter two ranges 0125ma constant-current charging small batteries 0-125 amps unreg ulated charging motorcycle batteries like Pro-line simultaneous charger two 48 VDC packs transmitter 48VDC pack receiver battery eliminator pocket calculator has fitted adapter permit charging 450-maH flight pack Since charger has no pilot light adapter includes LED purpose Cannon charger simultaneous charging 96 VDC transmitter 225-maH 48VDC receiver pack An adapter made two Deans connec tors resistor facilitate charging l00-maH flight pack Cox/Sanwa charger simultane ously charging 108 VDC transmitter pack 450-maH 48VDC receiver pack Note looks like Cannon charger actually quite different 9 oclock position An Ace R/C Inc metered van-charger unit provides constant-current source adjustable lOOmaH batteries I5VDC cute part device LED glows connect pack correctly before turning charger will glow backwards especially nice because meter indicates current going out re gardless have connected pack being charged typical metered chargers general Astro-Flight Inc R/C System Analyzer & Rapid Charger unit capable doing battery pack discharge test 10 minutes recharging pack completely 30 minutes use recom mend unit explains extra switch middle panel pack adapters above im portant features unit meter mechanical clock/switch may forget clock wont center display Kraft Fast Charger ca 1972 fig ured embarassment some wellknown fliers recently used according instructions came charger works exactly should point above descriptions units serves useful purpose no such thing best charger best way charge batteries hope answers some letters have received request plans best unit doubt use came system fol low instructions Before proceeding circuitry should state couple definitions charging battery cause chemical changes within cell permit give back electrical current period time dimensions capacity C work stored battery cells ordinarily used RC systems defined milli amperes X hours maH Note capacity capacitance -measure properties condenser also marked C battery charger used charge battery battery pack charger gives current battery order relate properties charger properties battery measure charging current compare cur rent battery rated yield hours Therefore find common RC system batteries rated 45OmaH usual charger puts about 45 ma charger rated C/b charger 45ma a get 10 Connected single cell charger may March 1978 13 An assortment specialpurpose battery chargers See text descriptions Knowing condition battery pack proper charging dependability saves airplane COPP2R UJIE.P lD%fSlD COIJTACT 30 BATTERY 0 Schematic diagram adapter Pick Ri 20 ma through LED Pick R2 bypass additional current batteries being charged asfound necessary yield entirely different current say SOma situation charger would rated C/3 charger because would putting full charge hour materials used construct nickle cadmium cells same manu facturers properties cell chemistry during charging cell liberates oxygen gas discharged cell being charged chemistry can take care gas fast forms However cell fully charged being driven overcharged condition charging rate becomes very important C/l0 rate cell can tol erate lot overcharging usually 200% Therefore customarily call 50% overcharge manufac turers call 14 16 hours charging forget disconnect youve got least another day remember C/10 charging tolerant mistakes C/3 charging case chemistry cant keep up gas pres sure within cell rises overcharging continues 100% pressure gets high enough open vent cell gas escapes taking some cells original capacity Repeated over charging C/3 rate can damage cell need automatic shutoff some way know what state charge start way operate Fast charger always discharge cells 11 volts per cell level before Fast charging can put back 120% rated charge reasonably certain having fully charged cell Higher rates charging up bC possible sensitivity overcharg ing penalties neglect become much serious lOC rate over charged cell may actually explode Highrate charging no worse C/l0 charg ing less tolerant error Fig 2 shows AFI charger ready charge Cox/Sanwa transmitter have problem Cox/Sanwa transmit ter contains nine nickle-cadmium batter ies instead usual 8 full charge pack shows us about 13 VDC car motorcycle battery shows I2VDC cant get charge way ad dition AFI charger contains diode prevent us fast charging reverse diode drops about 08 VDC engineers Sanwa also installed diode charging jack avoid accidental short circuiting exposed pin drops another 08 VDC So need totalof 13 146VDCtodothejob automobile engine running see about 135 VDC cigar lighter leaves us 11 VDC short mentioned Bob Boucher Astro Flight Inc said make adapter * will put battery two series Rapid charger did worked meter Rapid charger reads charger its finished beCon tinued page 8S 14 Model Aviation out-up rut urcring .uat catuwa iarr,ciurarm nr Rapid Chargerpruuau urrru over what doing working batteries will reward comfort W OUTSIDE CONTACT SILVER WIRE - Schematic diagram AFI/Cox/Sanwa Rapid Charging setup simple adapter makes - ERYT V Letters Editor continued page 60 States Air Force have building flying models since age 13 am enclosing picture planes built flown 1957 Richard Gardner Ft Worth TX AMA has sent Mr Gardner Club Kit Rule Book Membership Applica tion materials free anyone terested joining AMA Take Bow Walt would like take opportunity thank Walt Schoonard excellent column helicopters Model via tion magazine Im sure others will agree Walt has added greatly knowledge interested radio con trol helicopters has made sug gestions improving performance safety helicopters enjoy fly ing much Thank Walt Roger WMay College Place WA CORRECTION delighted presentation article About Size following errata captions describing photos did write reference triple redundant photographers camera required nail down critical spray peaks three dimensions three cameras indeed neces sary Skate model suspended rig balsa metal being carried rig mounted launch about 20 feet long fitted out purpose test being run Estuary small inlet San Diego Bay first paragraph page 11 sev eral places Time t expressed KS should read K Bradford Powers Schoolwork Fun/Warner continued page 12 ing site crashing least plane trying hard enough crash learning takes place stress need carefully ob serve flight Knowing whether plane crashed right spiral left spiral makes world difference what cor rective action take Hypothesize what caused problem test hypothesis making corrections before flying again repeat process try have ask watch first flights successive ones plane doing what should second-opinion method planes get flying better better last session inviting parents come out watch Results really impressive especially about 1000 am thermals start cooking off black-top return classroom critique after session go over common problems Some hardware have built class includes 1/4-hp wind machine demonstrating lift/drag control surfaces spiral propwash demonstrator prop unhooked model able turn freely its longitudinal axis moment-arm balance scale couple blow-between balls toilet-paper tube goodies Bernoulli effect old spooland-card trick thrust-measuring device show relationships between different props different size motors cansmash gallon can steam ping pong ball hair-dryer airstream lots flying demonstrators mentioned earlier product review product review product review ACE 25th Anniversary Catalogue over quarter centry ago Paul Runge founder proprietor ACEalong son Tom re cently Air Forcewas flying RC found like rest pioneer fliers parts almost impossible get Radio Shack Boston Commonplace items components could found big radio sup ply stores day requiring nationwide search such essentials National Coil Forms 3A4 3D6 tubes magnet wire Realizing others sharing problems Runge founded ACE R/C first small ad appearing May 1953 issue Air Trails first catalogue 2-sheet affair printed spirit duplicator new 72-pg ACE catalogue still offers hard-to-get parts also covers kits parts assembly modern reliable gear Contain ing vast array items catalogue costs $100 add 50c first class mail returnl $100 catalogue refundable first order ACE R/C Box 511G Higgins yule MO 64037 product review product review product review Such program can put together almost anywhere form another reasons succeeds well due support California Mu seum Foundation Gerry Richer Summer Science Workshop director give pretty much free hand plan class provide financial moral help Teachers picked because nuts about what doing love job well cant imagine someone being assigned teach class like As other kinds help lots super people will help people like Bill Hannan Art Guenther Tony Naccarato Frank Zaic over country Ask owe great deal model aviation passing some fun kids program can start repaying sides else can get paid playing toy airplanes Sources Supply Helium welding supply store LA 245 cuft bottle costs $35 gas wsth $70 deposit $390/mo rental balloon filler buy $28 Balloons California Toytime Balloon Co 1116 West 7th St San Pedro CA has Zeppelin balloons gross gross regular round balloons about $30 both JASCO X-18 JASCO Box 135 North ridge CA 91324 Ask fleet rate catalog Frank Zaic has other beginners kits too X-18 queen line has rubber too Sleek Streeks almost dime stores toy dealers no luck try manufacturer North Pacific Products Bend Oregon Retail late 1977 $59 ea have two kinds balsa styrofoam wing Take balsa Rubber winders Sterling Models 3620 GSt Philadelphia PA 19134 Brochure Summer Science Workshop winter Exploring Science Sat urdays program teach abridged version Aeroplanes Flying Ma chines class call Uncle Bills Fly ing Circus Available ESS/SSW California State Museum Science Industry 700 State Drive Los Angeles CA 90037 RC Technique/Myers continued page 14 fore brought out separate lead purpose may prefer adapter important thing remember positive lead Rapid charger con nects negative terminal exter nal battery Ive sketched out Fig 3 Fig 4 gives close look metered van-charger available kit ACE R/C Inc Box 511 Higgins ville MO 64037 son Tim 14 years old built about hour unit has MarCh1978 85 KA Jill 1$ ACE l/ inc 90X56W 9HS KGGNSV E MO 6403 99] [Au 111331 BOX 511E HIGGINSVILLE MO 64037 SERVICE TO THE R/C MODELER FORA 91 TER OF CENTURY Send revised 1978 catalog $1 Add $ 50 1st Class return Add $1 handling other orders uses including power supply small experimental circuts can rejuvenate flashlight batteries Use 3Oma until cell voltage reaches 1 5VDC again pen-cell battery box shown attached used purpose Fig 5 shows calculator charger box on-the-wall type simple adapter built pill bottle Fig 6 schematic Deans connector adapter reminds must very careful label adapters chargers Several manufacturers use Deans connectors Cit izenship Pro-Line ACE R/C Can non come mind immediately dont use pins same purposes Use voltmeter check out before turn charger perhaps some damage Ive confused please read col writing advertisers mention read about MA umn again Ive tried keep things simple possibleno chemistry no math just facts Ive tried show Rapid Charging safe used intelligence Examples shown demonstrate shouldnt play mixand-match components various manufacturers checking first see what Charger ratings ex plained help choose what need good general-purpose charger identified should prepared decision Happy Flying Keep cards letters coming Im very far behind right now expect catch up now winter has set Windlord/Bates continued page 20 adjusting CG small increments until stable floating glide achieved setting Towing accomplished bridle shown Figure E tie bridle snap swivel Pass through ring snap-swivel use large enough tow rings cannot pass through side bridle ring will stop snap swivel allow com plete tow One-side tows possible requiring about 100 rudder deflection correct yaw may substitute conventional hooks releasable capture hooks may necessary launching winch continuously pulse winch rapidly through early portion tow cluding tensioning line launch will maintain constant tension tow like hi-start run winch continuously until ship has - started rotate climb sud denly release pressure line may experience slight pitch up releasing tow bridle Efficient thermaling turns can made quite tightly penetration down elevator trim excellent Inverted flight almost good upright Windlord can made outside loop verted rudder does reverse Right still right Dont ask Dethermaliz ing done flaps shallow verted dive since upright dive builds speed rapidly speed does bleed off quickly Orientation has problem looks much like hawk distance dont recommend using dark color scheme Enjoy Windlord dont lose gaggle hawks RC Aerobatks/VanPutte continued page 21 very familiar necessity coordi nate application aileron rudder attempts roll light aircraft using aileron nose will generally yaw wrong direction before rolls Some airplanes like J-3 Cub will end up skid wing barely higher other important fact adverse yaw causes nose airplane move lat erally opposite direction roll before airplane really begins rol ling Consequently roll begun aircraft yawed condition what makes axial roll look bad Aile ron differential helps make axial rolls look better reducing initial adverse yaw other sources yaw roll require air plane must rolling order generate yawing moment causes yaw 86 Model Aviation FAMOUS BRITISH DIESELS DIC RAW * *NEWr * EATA LOG-DIESEL HANDBOOK $150 pp HOBBY H IDEAWAY DELAVMqILLe17a4 MORRISONSCALE DRAWINGS REPLA-TECH ntrfltIOfl@I CATALOG 25c vs 48500 McKenzie Hwy Vids Oregon 97488 George M Myers 70 Froehlich Farm Road Hicksville NY 11801 ACE R/C Inc metered van-charger can solve miscellaneous charging prob lems has handy indicator warn you should accidentaly connect backwards
Edition: Model Aviation - 1978/03
Page Numbers: 13, 14, 85, 86
George Nt Myers THE MAN says its time talk about charging batteries again goes Ill try put few new items just wont bore have heard fore should obvious people use charger came RC sys tem according instruction packed box really dont need additional information So wheres problem two basic types problems first type impatience forget charge batteries until ready go flying decide need Quick Fast Rapid charger buy worry have done right thing buy flight pack batteries rated differently pack came system need some way know whether or charge system charger Corollary situation need new charger can charge everything once Fig 1 shows representative collection chargers have acquired used over years Beginning oclock position reading clockwise see KF Uni-charger ca 1960 basically model railroad transformer rectifier meter two ranges 0125ma constant-current charging small batteries 0-125 amps unreg ulated charging motorcycle batteries like Pro-line simultaneous charger two 48 VDC packs transmitter 48VDC pack receiver battery eliminator pocket calculator has fitted adapter permit charging 450-maH flight pack Since charger has no pilot light adapter includes LED purpose Cannon charger simultaneous charging 96 VDC transmitter 225-maH 48VDC receiver pack An adapter made two Deans connec tors resistor facilitate charging l00-maH flight pack Cox/Sanwa charger simultane ously charging 108 VDC transmitter pack 450-maH 48VDC receiver pack Note looks like Cannon charger actually quite different 9 oclock position An Ace R/C Inc metered van-charger unit provides constant-current source adjustable lOOmaH batteries I5VDC cute part device LED glows connect pack correctly before turning charger will glow backwards especially nice because meter indicates current going out re gardless have connected pack being charged typical metered chargers general Astro-Flight Inc R/C System Analyzer & Rapid Charger unit capable doing battery pack discharge test 10 minutes recharging pack completely 30 minutes use recom mend unit explains extra switch middle panel pack adapters above im portant features unit meter mechanical clock/switch may forget clock wont center display Kraft Fast Charger ca 1972 fig ured embarassment some wellknown fliers recently used according instructions came charger works exactly should point above descriptions units serves useful purpose no such thing best charger best way charge batteries hope answers some letters have received request plans best unit doubt use came system fol low instructions Before proceeding circuitry should state couple definitions charging battery cause chemical changes within cell permit give back electrical current period time dimensions capacity C work stored battery cells ordinarily used RC systems defined milli amperes X hours maH Note capacity capacitance -measure properties condenser also marked C battery charger used charge battery battery pack charger gives current battery order relate properties charger properties battery measure charging current compare cur rent battery rated yield hours Therefore find common RC system batteries rated 45OmaH usual charger puts about 45 ma charger rated C/b charger 45ma a get 10 Connected single cell charger may March 1978 13 An assortment specialpurpose battery chargers See text descriptions Knowing condition battery pack proper charging dependability saves airplane COPP2R UJIE.P lD%fSlD COIJTACT 30 BATTERY 0 Schematic diagram adapter Pick Ri 20 ma through LED Pick R2 bypass additional current batteries being charged asfound necessary yield entirely different current say SOma situation charger would rated C/3 charger because would putting full charge hour materials used construct nickle cadmium cells same manu facturers properties cell chemistry during charging cell liberates oxygen gas discharged cell being charged chemistry can take care gas fast forms However cell fully charged being driven overcharged condition charging rate becomes very important C/l0 rate cell can tol erate lot overcharging usually 200% Therefore customarily call 50% overcharge manufac turers call 14 16 hours charging forget disconnect youve got least another day remember C/10 charging tolerant mistakes C/3 charging case chemistry cant keep up gas pres sure within cell rises overcharging continues 100% pressure gets high enough open vent cell gas escapes taking some cells original capacity Repeated over charging C/3 rate can damage cell need automatic shutoff some way know what state charge start way operate Fast charger always discharge cells 11 volts per cell level before Fast charging can put back 120% rated charge reasonably certain having fully charged cell Higher rates charging up bC possible sensitivity overcharg ing penalties neglect become much serious lOC rate over charged cell may actually explode Highrate charging no worse C/l0 charg ing less tolerant error Fig 2 shows AFI charger ready charge Cox/Sanwa transmitter have problem Cox/Sanwa transmit ter contains nine nickle-cadmium batter ies instead usual 8 full charge pack shows us about 13 VDC car motorcycle battery shows I2VDC cant get charge way ad dition AFI charger contains diode prevent us fast charging reverse diode drops about 08 VDC engineers Sanwa also installed diode charging jack avoid accidental short circuiting exposed pin drops another 08 VDC So need totalof 13 146VDCtodothejob automobile engine running see about 135 VDC cigar lighter leaves us 11 VDC short mentioned Bob Boucher Astro Flight Inc said make adapter * will put battery two series Rapid charger did worked meter Rapid charger reads charger its finished beCon tinued page 8S 14 Model Aviation out-up rut urcring .uat catuwa iarr,ciurarm nr Rapid Chargerpruuau urrru over what doing working batteries will reward comfort W OUTSIDE CONTACT SILVER WIRE - Schematic diagram AFI/Cox/Sanwa Rapid Charging setup simple adapter makes - ERYT V Letters Editor continued page 60 States Air Force have building flying models since age 13 am enclosing picture planes built flown 1957 Richard Gardner Ft Worth TX AMA has sent Mr Gardner Club Kit Rule Book Membership Applica tion materials free anyone terested joining AMA Take Bow Walt would like take opportunity thank Walt Schoonard excellent column helicopters Model via tion magazine Im sure others will agree Walt has added greatly knowledge interested radio con trol helicopters has made sug gestions improving performance safety helicopters enjoy fly ing much Thank Walt Roger WMay College Place WA CORRECTION delighted presentation article About Size following errata captions describing photos did write reference triple redundant photographers camera required nail down critical spray peaks three dimensions three cameras indeed neces sary Skate model suspended rig balsa metal being carried rig mounted launch about 20 feet long fitted out purpose test being run Estuary small inlet San Diego Bay first paragraph page 11 sev eral places Time t expressed KS should read K Bradford Powers Schoolwork Fun/Warner continued page 12 ing site crashing least plane trying hard enough crash learning takes place stress need carefully ob serve flight Knowing whether plane crashed right spiral left spiral makes world difference what cor rective action take Hypothesize what caused problem test hypothesis making corrections before flying again repeat process try have ask watch first flights successive ones plane doing what should second-opinion method planes get flying better better last session inviting parents come out watch Results really impressive especially about 1000 am thermals start cooking off black-top return classroom critique after session go over common problems Some hardware have built class includes 1/4-hp wind machine demonstrating lift/drag control surfaces spiral propwash demonstrator prop unhooked model able turn freely its longitudinal axis moment-arm balance scale couple blow-between balls toilet-paper tube goodies Bernoulli effect old spooland-card trick thrust-measuring device show relationships between different props different size motors cansmash gallon can steam ping pong ball hair-dryer airstream lots flying demonstrators mentioned earlier product review product review product review ACE 25th Anniversary Catalogue over quarter centry ago Paul Runge founder proprietor ACEalong son Tom re cently Air Forcewas flying RC found like rest pioneer fliers parts almost impossible get Radio Shack Boston Commonplace items components could found big radio sup ply stores day requiring nationwide search such essentials National Coil Forms 3A4 3D6 tubes magnet wire Realizing others sharing problems Runge founded ACE R/C first small ad appearing May 1953 issue Air Trails first catalogue 2-sheet affair printed spirit duplicator new 72-pg ACE catalogue still offers hard-to-get parts also covers kits parts assembly modern reliable gear Contain ing vast array items catalogue costs $100 add 50c first class mail returnl $100 catalogue refundable first order ACE R/C Box 511G Higgins yule MO 64037 product review product review product review Such program can put together almost anywhere form another reasons succeeds well due support California Mu seum Foundation Gerry Richer Summer Science Workshop director give pretty much free hand plan class provide financial moral help Teachers picked because nuts about what doing love job well cant imagine someone being assigned teach class like As other kinds help lots super people will help people like Bill Hannan Art Guenther Tony Naccarato Frank Zaic over country Ask owe great deal model aviation passing some fun kids program can start repaying sides else can get paid playing toy airplanes Sources Supply Helium welding supply store LA 245 cuft bottle costs $35 gas wsth $70 deposit $390/mo rental balloon filler buy $28 Balloons California Toytime Balloon Co 1116 West 7th St San Pedro CA has Zeppelin balloons gross gross regular round balloons about $30 both JASCO X-18 JASCO Box 135 North ridge CA 91324 Ask fleet rate catalog Frank Zaic has other beginners kits too X-18 queen line has rubber too Sleek Streeks almost dime stores toy dealers no luck try manufacturer North Pacific Products Bend Oregon Retail late 1977 $59 ea have two kinds balsa styrofoam wing Take balsa Rubber winders Sterling Models 3620 GSt Philadelphia PA 19134 Brochure Summer Science Workshop winter Exploring Science Sat urdays program teach abridged version Aeroplanes Flying Ma chines class call Uncle Bills Fly ing Circus Available ESS/SSW California State Museum Science Industry 700 State Drive Los Angeles CA 90037 RC Technique/Myers continued page 14 fore brought out separate lead purpose may prefer adapter important thing remember positive lead Rapid charger con nects negative terminal exter nal battery Ive sketched out Fig 3 Fig 4 gives close look metered van-charger available kit ACE R/C Inc Box 511 Higgins ville MO 64037 son Tim 14 years old built about hour unit has MarCh1978 85 KA Jill 1$ ACE l/ inc 90X56W 9HS KGGNSV E MO 6403 99] [Au 111331 BOX 511E HIGGINSVILLE MO 64037 SERVICE TO THE R/C MODELER FORA 91 TER OF CENTURY Send revised 1978 catalog $1 Add $ 50 1st Class return Add $1 handling other orders uses including power supply small experimental circuts can rejuvenate flashlight batteries Use 3Oma until cell voltage reaches 1 5VDC again pen-cell battery box shown attached used purpose Fig 5 shows calculator charger box on-the-wall type simple adapter built pill bottle Fig 6 schematic Deans connector adapter reminds must very careful label adapters chargers Several manufacturers use Deans connectors Cit izenship Pro-Line ACE R/C Can non come mind immediately dont use pins same purposes Use voltmeter check out before turn charger perhaps some damage Ive confused please read col writing advertisers mention read about MA umn again Ive tried keep things simple possibleno chemistry no math just facts Ive tried show Rapid Charging safe used intelligence Examples shown demonstrate shouldnt play mixand-match components various manufacturers checking first see what Charger ratings ex plained help choose what need good general-purpose charger identified should prepared decision Happy Flying Keep cards letters coming Im very far behind right now expect catch up now winter has set Windlord/Bates continued page 20 adjusting CG small increments until stable floating glide achieved setting Towing accomplished bridle shown Figure E tie bridle snap swivel Pass through ring snap-swivel use large enough tow rings cannot pass through side bridle ring will stop snap swivel allow com plete tow One-side tows possible requiring about 100 rudder deflection correct yaw may substitute conventional hooks releasable capture hooks may necessary launching winch continuously pulse winch rapidly through early portion tow cluding tensioning line launch will maintain constant tension tow like hi-start run winch continuously until ship has - started rotate climb sud denly release pressure line may experience slight pitch up releasing tow bridle Efficient thermaling turns can made quite tightly penetration down elevator trim excellent Inverted flight almost good upright Windlord can made outside loop verted rudder does reverse Right still right Dont ask Dethermaliz ing done flaps shallow verted dive since upright dive builds speed rapidly speed does bleed off quickly Orientation has problem looks much like hawk distance dont recommend using dark color scheme Enjoy Windlord dont lose gaggle hawks RC Aerobatks/VanPutte continued page 21 very familiar necessity coordi nate application aileron rudder attempts roll light aircraft using aileron nose will generally yaw wrong direction before rolls Some airplanes like J-3 Cub will end up skid wing barely higher other important fact adverse yaw causes nose airplane move lat erally opposite direction roll before airplane really begins rol ling Consequently roll begun aircraft yawed condition what makes axial roll look bad Aile ron differential helps make axial rolls look better reducing initial adverse yaw other sources yaw roll require air plane must rolling order generate yawing moment causes yaw 86 Model Aviation FAMOUS BRITISH DIESELS DIC RAW * *NEWr * EATA LOG-DIESEL HANDBOOK $150 pp HOBBY H IDEAWAY DELAVMqILLe17a4 MORRISONSCALE DRAWINGS REPLA-TECH ntrfltIOfl@I CATALOG 25c vs 48500 McKenzie Hwy Vids Oregon 97488 George M Myers 70 Froehlich Farm Road Hicksville NY 11801 ACE R/C Inc metered van-charger can solve miscellaneous charging prob lems has handy indicator warn you should accidentaly connect backwards