George Myers THE Coulomb meter batteries like bottles CocaColaR could look see much charge contain Theyre need another way assess state charge General Varionics Inc_10 Adelphi Drive Greenlawn NY 11740 offers new system purpose heart system device called Coulomb meter looks bit like thermometer since indicating ele ment bubble transparent electrolyte middle column mercury encased glass tube unit electrical charge named Coulomb specifies quantity charge conveyed current ampere acting second small current electricity flows through Coulomb meter bubble electrolyte migrates toward end column An electronic package samples current flow ing RC system provides controlling current Coulomb meter propor tioned both magnitude current time flows Thus meter indication represents integrated current X time sum charge has flowed past meter since last set zero true indicating bubble can move either way tube does important fact meter/cover assembly has plugged base unit us good base units let metering current flow out terminal other never let flow opposite direction Therefore bubble moves 0 end scale base unit toward 600 end bubble moves off 600 end scale either slide scale down until bubble over 0 again lift off meter/cover swap end-forend plug back base again General Varionics Inc offers three devices use coulomb meter indicator Minicycle battery discharger separate pair wires provided discharge time please packs made up 4 5 8 9 nickle cadmium cells fifth pair wires provided discharge 4-cell packs rated 1200 maH becoming popular Quarter Scale modelers device powered battery being discharged dont have plug wall motorcycle battery get work List price $3895 PlC 5000 device flies airplane can installed between switch hamess receiver read charge removed pack between receiver servo evaluate servos performance List price $2495 Unicycle 5000 battery charger/discharger plugs wall 4-cell flight packs 8-cell transmitter packs List price $5995 Ira Faberman visited sys tem middle wintertime chore testing batteries own connected Unicycle 5000 silver wire er wire ems observed lights worked Charging current 50 ma advertised Discharge current 275 ma 48 VDC momentary interruption circuit caused switch Charge mode Later measurements established dis charge current dropped battery terminal voltage dropped characteristic con stant-resistance discharging circuits Cutoff voltage flight pack discharge 40 VDC course week between-time testing 20 Model Aviation Coulomb meter lathe glass tube filled mercury arrow pointsto tne bubble electro lyte used indicator Regardless several General Varionics units installed first mounted protective covershown universal coverthen plugs devices described column Coulomb meter installed just above words MINI-CYCLE prototype unit movable scale forthe meter can seen through window meter/cover separate leads used discharging nickle-cadmium battery packs 4 5 8 cells George has installed PlC 5000 aileron extender cable red wires go junction white another green wire joins black negative ground wire receiver PlCs black wire joins separately black wire batterypack end adapter little care making connections goes long way toward preserving system reliability managed test flight pack sons have put adhesive labels showing date test results good time same equipment Next turned attention transmitter packs Unicycle 5000 set up discharge 8cell packs normallythough modifications test 9-cell packs Cox/Sanwa instance available special order using set up 8-cell packs cut off 80 VDC used Cox/Sanwa transmitters anyway cutoff 088 VDC per cell isnt likely cause trouble increase measured capacity negligible calibration meter remains valid Discharge current 320 ma instead 280 ma change isnt large enough damage anything found some bad cells test dont think makes sense fully discharge set time prepare recharge occasional testing definitely worthwhile rate tested battery packs replaced batteries necessary stuck labels packs indicating final test results date brought pack up full charge put things storage Ill recharge once month throughout winter season should too OK kind battery testing boring Minicycle Unicycle make bit less chore manually recorded amps time through exercise check various calibrations accumulate data usual way photos shows general set-up difference between sort battery cycling testing accustomed General Varionics system lies PlC 5000 Coulomb meter flies aircraft start freshly-charged batteries PlC 5000 set zero Knowing capacity established pack Minicycle Unicycle 5000 observe ter after flight see much charge has used can mount another PlC transmitter read charge removed its pack feel need Meter/covers interchangeable calibrations match within 2% may plug meter Minicycle Unicycle 5000 PlC 5000 should something unfor tunate happen instruction sheet shows cut system wiring installation PlC 5000 preferred cut aileron extension cable three reasons Plc 5000 can now installed between receiver servo first conven ient tool assessing hard particu lar servo working given instaliation flight Quarter Scale modelers should find application very interesting PlC 5000 can installed between switch harness receiver intended use allows see much charge remains flight pack calibration data tells much disconnected charger PlC 5000 can installed between charg ing jack battery cycler will allow assess charge remaining verify PlC 5000 calibration should observe following restrictions 1 Continuous discharge current must exceed 300 ma 2 Allow 08 VDC drop across PlC 5000 photos shows installed PlC 5000 helicopter position scale can examined before starting helicopter brings mind couple cautions PlC 5000 measures charge passes through let pack sit around week after charging before flying certain amount charge will leak between plates inside battery PlC 5000 wont know about wont compensate Cold packs give back part energy charged PlC 5000 compensated show loss available energy what did put flight pack outdoors 200F let cool down ran discharge calibration outdoors Minicycle made easy must protect meter vibration Never stick directly structure foam tape meter too delicate kind abuse Ill use rest space simulated Q & session Q Can Unicycle 5000 used charge trans mitter receiver simultaneously Yes Q Can Unicycle 5000 charge dis charge other simultaneously Yes Q What happens bubble moves way across window pull meter/cover straight up its held couple pins turn 180 degrees put back down Q What happens let bubble make way end tube buy another meter Note would have forget meter least twice before would happen New meters cost $4 Q Will Unicycle 5000 charge discharge batteries Wthe meter/cover missing Yes Q Can devices used 100 maH 2S0 maH packs Yes Realize 600 maH occupies scale space would very difficult see much change 1/6 5/l2ths inch total motion would get 100 250 maH packs manufacturer recommends use 450 600 maH packs Q What happens connect wires back wards charge will charge bat teries backwards can have diastrous effect discharge will take down batteries indicating thing meter voltagecutoff protection Please pay attention color code connect things correctly Q Do find meter hard read used magnifying glass Q Iflput PlC 5000 between switch har ness flight battery will charging current make meter run backwards No system protected against reverse cur rents Q If meter cover falls off piece metal shorts across exposed contacts will system damaged No Q What insertion impedance PlC 5000 shunted 47 mfd equates 1/g VDC drop two servos move Q How much current does PlC 5000 draw depends current drawn system Continued page 108 July 1980 21 set-up George used check out batteries Unicycle 5000 calibration ammeter stopwatch clipboard data log pocket calculator battery pack undertest pen Unicycle 5000 Duplicate job right yourselfl George has installed PlC 5000 Heliboy very important isolate meterelement possible sources vibration particu larly helicopters Winning Ideas FOURMOST RETRACTABLE VTOW HOOK RELEASE Price $575 Simplest reliable device available After line released hook retracts body unit leaving SMOOTH surface bottom aircraft No special attachments required N eight oz OTHER FOURMOST PRODUCTS 0491051 AIRFLO ENGINE MOUNT REDUCES DRAG VIBRATION FREE PRICE 250 40 AIRFLO ENGINE MOUNT IDEAL FOR QIJICKY 500 PRICE 525 RC TECHNIQUES/MYERS continued page 21 between 600 micro-amps 15 ma Q What happens system PlC 5000 fails integrated circuit meter base may fail open short open no change short internal diode will blow open less second Q What effect does temperature have unit No significant calibration change range 0 150 degrees F Q Is ultimate battery management system No cant handle quick-charging plc sooo wont pick up fact cell has short-circuited since last charging need expanded-scale voltmeter things tools used intelligence understanding PlC 5000 allows make measurement couldnt make before servo demand flight Q Whats difference between PlC 5000 transmitter receiver No difference PlC 5000 accepts voltages 35 18 VDC personal standards column require use thoroughly understand product before writing about and/or recommending case system flu gave DEPENDABLE Friend CIL Launching week spare time spend testing As result some discrepancies found manufacturer has corrected production models feel have contributed bit development products also feel know well enough say confidence conservatively-designed units work right cant find way can hurt Some readers have complained need footnotes understand what Im talking about technology has its jargon outside technology cant expected know what special words mean Therefore will time time print few definitions end column Heres first installment ma - milliamperes Electrical current flows rate measured Amperes Electronic circuits use such tiny flows convenience measuring use units 1/1000 large called milli 1/1000th amperes VDC Volts Direct Current pressure causes electrical current flow measured Volts Batteries provide push push direction years ago people decided call battery current Direct Current still diode device allows current flow direction can think electrical check-valve wish case PlC 5000 check-valve used tiny instead blocking incorrect current resulting short circuit melts down like fuse completely disconnecting circuit Thats enough month Keep letters flowing folks George Myers 70 Froehlich Farm Road Hicks ville NY 11801 RC SCALE/WISCHERS continued page 33 hurst New Jersey past summer fascinated performance Peter French Zlin 526 British Nats So much purchased kit have flying Saudi Arabia has wing span 86 does aerobatics powered 60 engine because weighs 8 2 Ibs no US kits market can compare British National Sport Scale event won Grumman Skyrocket five foot wingspan powered two OS Max 20s scale speed model should move across sky same speed its real counterpart appears moving far enough away appear same size Said another way model its real counterpart correct distances viewer appear same size should also covering same angular distance same amount time should wait until national-level competition impose flight realism would have time standards estab lished explained AMA rule book dont see increasing permissible engine size competition will encourage modelers built light As has previously discussed column no question planes low wing loadings can made operate scale speeds questionable however whether would find desirable since cant control wind velocity air density Reynolds numbers best can hope achieve illusion scale speed argument has going since started writing column 1980 AMA rule book will contain ajudges guide should helpful establishing realism speed related Bob andDolly Wischer Rt 1 S-221 Lapham Peak Road Delafield WI 53018 RC TOLEDO/BECKMAN continued page 11 addition 11-member Board Repre sentatives selected board includes members throughout US Cana da member France Due time space limitations its im possible cover everything see Toledo year Ill adding re ports regular column over next few months omissions certain ly intentional readers conve nience addresses suppliers ganizations mentioned follow Aero Plan 101 SW 2nd St Pompano Beach FL 33060 Balsa USA PO Box 164 Marinette WI 54143 Barrons Scale Classics 1213 Holly Spring Lane Grand Blanc Ml 48439 Bob Dively Model Aircraft Inc 28001 Cha grin Blvd Woodmere OH 44122 108 Model Aviation Fuel Fitting Sets Fuel Shut Off Fuel Manifold Gapless Hinges Gapless Hinge Slotter Strut Fairings Cockpit Coeming FUR~ST Send SASE Complete Information 4040 24th Ave Forest Grove OR 97116 PRODUCTS Phone 503 357-2732 AUDIO FLIGHT TIMER Prevents dead-stick landinas Generates incremental audio timing signals Ideal timing pattern flights giiaers Doass etc case less battery $2495 shipping Less case mounts transmitter $2195 shipping Write free brochure Industrial Inventions Inc RD2 463 US Route 1 Monmouth Jct New Jersey 08852 dont need cali friend time want get Control Line model air new remote release SAFE bC iauncher Strong Safe Ready4ogo anytime STRONG Safety pull-tested 125 lbs pressure strong enough iargest C/L airplanes SAFE Nasa built-in lock prevent accidental release IF NOT AT YOUR DEALER R DIRECT $5300sT CLAIR MODEL COMPONENTS P0 Box 5626 PP ndieUSAEugene OR 97405
Edition: Model Aviation - 1980/07
Page Numbers: 20, 21, 108
George Myers THE Coulomb meter batteries like bottles CocaColaR could look see much charge contain Theyre need another way assess state charge General Varionics Inc_10 Adelphi Drive Greenlawn NY 11740 offers new system purpose heart system device called Coulomb meter looks bit like thermometer since indicating ele ment bubble transparent electrolyte middle column mercury encased glass tube unit electrical charge named Coulomb specifies quantity charge conveyed current ampere acting second small current electricity flows through Coulomb meter bubble electrolyte migrates toward end column An electronic package samples current flow ing RC system provides controlling current Coulomb meter propor tioned both magnitude current time flows Thus meter indication represents integrated current X time sum charge has flowed past meter since last set zero true indicating bubble can move either way tube does important fact meter/cover assembly has plugged base unit us good base units let metering current flow out terminal other never let flow opposite direction Therefore bubble moves 0 end scale base unit toward 600 end bubble moves off 600 end scale either slide scale down until bubble over 0 again lift off meter/cover swap end-forend plug back base again General Varionics Inc offers three devices use coulomb meter indicator Minicycle battery discharger separate pair wires provided discharge time please packs made up 4 5 8 9 nickle cadmium cells fifth pair wires provided discharge 4-cell packs rated 1200 maH becoming popular Quarter Scale modelers device powered battery being discharged dont have plug wall motorcycle battery get work List price $3895 PlC 5000 device flies airplane can installed between switch hamess receiver read charge removed pack between receiver servo evaluate servos performance List price $2495 Unicycle 5000 battery charger/discharger plugs wall 4-cell flight packs 8-cell transmitter packs List price $5995 Ira Faberman visited sys tem middle wintertime chore testing batteries own connected Unicycle 5000 silver wire er wire ems observed lights worked Charging current 50 ma advertised Discharge current 275 ma 48 VDC momentary interruption circuit caused switch Charge mode Later measurements established dis charge current dropped battery terminal voltage dropped characteristic con stant-resistance discharging circuits Cutoff voltage flight pack discharge 40 VDC course week between-time testing 20 Model Aviation Coulomb meter lathe glass tube filled mercury arrow pointsto tne bubble electro lyte used indicator Regardless several General Varionics units installed first mounted protective covershown universal coverthen plugs devices described column Coulomb meter installed just above words MINI-CYCLE prototype unit movable scale forthe meter can seen through window meter/cover separate leads used discharging nickle-cadmium battery packs 4 5 8 cells George has installed PlC 5000 aileron extender cable red wires go junction white another green wire joins black negative ground wire receiver PlCs black wire joins separately black wire batterypack end adapter little care making connections goes long way toward preserving system reliability managed test flight pack sons have put adhesive labels showing date test results good time same equipment Next turned attention transmitter packs Unicycle 5000 set up discharge 8cell packs normallythough modifications test 9-cell packs Cox/Sanwa instance available special order using set up 8-cell packs cut off 80 VDC used Cox/Sanwa transmitters anyway cutoff 088 VDC per cell isnt likely cause trouble increase measured capacity negligible calibration meter remains valid Discharge current 320 ma instead 280 ma change isnt large enough damage anything found some bad cells test dont think makes sense fully discharge set time prepare recharge occasional testing definitely worthwhile rate tested battery packs replaced batteries necessary stuck labels packs indicating final test results date brought pack up full charge put things storage Ill recharge once month throughout winter season should too OK kind battery testing boring Minicycle Unicycle make bit less chore manually recorded amps time through exercise check various calibrations accumulate data usual way photos shows general set-up difference between sort battery cycling testing accustomed General Varionics system lies PlC 5000 Coulomb meter flies aircraft start freshly-charged batteries PlC 5000 set zero Knowing capacity established pack Minicycle Unicycle 5000 observe ter after flight see much charge has used can mount another PlC transmitter read charge removed its pack feel need Meter/covers interchangeable calibrations match within 2% may plug meter Minicycle Unicycle 5000 PlC 5000 should something unfor tunate happen instruction sheet shows cut system wiring installation PlC 5000 preferred cut aileron extension cable three reasons Plc 5000 can now installed between receiver servo first conven ient tool assessing hard particu lar servo working given instaliation flight Quarter Scale modelers should find application very interesting PlC 5000 can installed between switch harness receiver intended use allows see much charge remains flight pack calibration data tells much disconnected charger PlC 5000 can installed between charg ing jack battery cycler will allow assess charge remaining verify PlC 5000 calibration should observe following restrictions 1 Continuous discharge current must exceed 300 ma 2 Allow 08 VDC drop across PlC 5000 photos shows installed PlC 5000 helicopter position scale can examined before starting helicopter brings mind couple cautions PlC 5000 measures charge passes through let pack sit around week after charging before flying certain amount charge will leak between plates inside battery PlC 5000 wont know about wont compensate Cold packs give back part energy charged PlC 5000 compensated show loss available energy what did put flight pack outdoors 200F let cool down ran discharge calibration outdoors Minicycle made easy must protect meter vibration Never stick directly structure foam tape meter too delicate kind abuse Ill use rest space simulated Q & session Q Can Unicycle 5000 used charge trans mitter receiver simultaneously Yes Q Can Unicycle 5000 charge dis charge other simultaneously Yes Q What happens bubble moves way across window pull meter/cover straight up its held couple pins turn 180 degrees put back down Q What happens let bubble make way end tube buy another meter Note would have forget meter least twice before would happen New meters cost $4 Q Will Unicycle 5000 charge discharge batteries Wthe meter/cover missing Yes Q Can devices used 100 maH 2S0 maH packs Yes Realize 600 maH occupies scale space would very difficult see much change 1/6 5/l2ths inch total motion would get 100 250 maH packs manufacturer recommends use 450 600 maH packs Q What happens connect wires back wards charge will charge bat teries backwards can have diastrous effect discharge will take down batteries indicating thing meter voltagecutoff protection Please pay attention color code connect things correctly Q Do find meter hard read used magnifying glass Q Iflput PlC 5000 between switch har ness flight battery will charging current make meter run backwards No system protected against reverse cur rents Q If meter cover falls off piece metal shorts across exposed contacts will system damaged No Q What insertion impedance PlC 5000 shunted 47 mfd equates 1/g VDC drop two servos move Q How much current does PlC 5000 draw depends current drawn system Continued page 108 July 1980 21 set-up George used check out batteries Unicycle 5000 calibration ammeter stopwatch clipboard data log pocket calculator battery pack undertest pen Unicycle 5000 Duplicate job right yourselfl George has installed PlC 5000 Heliboy very important isolate meterelement possible sources vibration particu larly helicopters Winning Ideas FOURMOST RETRACTABLE VTOW HOOK RELEASE Price $575 Simplest reliable device available After line released hook retracts body unit leaving SMOOTH surface bottom aircraft No special attachments required N eight oz OTHER FOURMOST PRODUCTS 0491051 AIRFLO ENGINE MOUNT REDUCES DRAG VIBRATION FREE PRICE 250 40 AIRFLO ENGINE MOUNT IDEAL FOR QIJICKY 500 PRICE 525 RC TECHNIQUES/MYERS continued page 21 between 600 micro-amps 15 ma Q What happens system PlC 5000 fails integrated circuit meter base may fail open short open no change short internal diode will blow open less second Q What effect does temperature have unit No significant calibration change range 0 150 degrees F Q Is ultimate battery management system No cant handle quick-charging plc sooo wont pick up fact cell has short-circuited since last charging need expanded-scale voltmeter things tools used intelligence understanding PlC 5000 allows make measurement couldnt make before servo demand flight Q Whats difference between PlC 5000 transmitter receiver No difference PlC 5000 accepts voltages 35 18 VDC personal standards column require use thoroughly understand product before writing about and/or recommending case system flu gave DEPENDABLE Friend CIL Launching week spare time spend testing As result some discrepancies found manufacturer has corrected production models feel have contributed bit development products also feel know well enough say confidence conservatively-designed units work right cant find way can hurt Some readers have complained need footnotes understand what Im talking about technology has its jargon outside technology cant expected know what special words mean Therefore will time time print few definitions end column Heres first installment ma - milliamperes Electrical current flows rate measured Amperes Electronic circuits use such tiny flows convenience measuring use units 1/1000 large called milli 1/1000th amperes VDC Volts Direct Current pressure causes electrical current flow measured Volts Batteries provide push push direction years ago people decided call battery current Direct Current still diode device allows current flow direction can think electrical check-valve wish case PlC 5000 check-valve used tiny instead blocking incorrect current resulting short circuit melts down like fuse completely disconnecting circuit Thats enough month Keep letters flowing folks George Myers 70 Froehlich Farm Road Hicks ville NY 11801 RC SCALE/WISCHERS continued page 33 hurst New Jersey past summer fascinated performance Peter French Zlin 526 British Nats So much purchased kit have flying Saudi Arabia has wing span 86 does aerobatics powered 60 engine because weighs 8 2 Ibs no US kits market can compare British National Sport Scale event won Grumman Skyrocket five foot wingspan powered two OS Max 20s scale speed model should move across sky same speed its real counterpart appears moving far enough away appear same size Said another way model its real counterpart correct distances viewer appear same size should also covering same angular distance same amount time should wait until national-level competition impose flight realism would have time standards estab lished explained AMA rule book dont see increasing permissible engine size competition will encourage modelers built light As has previously discussed column no question planes low wing loadings can made operate scale speeds questionable however whether would find desirable since cant control wind velocity air density Reynolds numbers best can hope achieve illusion scale speed argument has going since started writing column 1980 AMA rule book will contain ajudges guide should helpful establishing realism speed related Bob andDolly Wischer Rt 1 S-221 Lapham Peak Road Delafield WI 53018 RC TOLEDO/BECKMAN continued page 11 addition 11-member Board Repre sentatives selected board includes members throughout US Cana da member France Due time space limitations its im possible cover everything see Toledo year Ill adding re ports regular column over next few months omissions certain ly intentional readers conve nience addresses suppliers ganizations mentioned follow Aero Plan 101 SW 2nd St Pompano Beach FL 33060 Balsa USA PO Box 164 Marinette WI 54143 Barrons Scale Classics 1213 Holly Spring Lane Grand Blanc Ml 48439 Bob Dively Model Aircraft Inc 28001 Cha grin Blvd Woodmere OH 44122 108 Model Aviation Fuel Fitting Sets Fuel Shut Off Fuel Manifold Gapless Hinges Gapless Hinge Slotter Strut Fairings Cockpit Coeming FUR~ST Send SASE Complete Information 4040 24th Ave Forest Grove OR 97116 PRODUCTS Phone 503 357-2732 AUDIO FLIGHT TIMER Prevents dead-stick landinas Generates incremental audio timing signals Ideal timing pattern flights giiaers Doass etc case less battery $2495 shipping Less case mounts transmitter $2195 shipping Write free brochure Industrial Inventions Inc RD2 463 US Route 1 Monmouth Jct New Jersey 08852 dont need cali friend time want get Control Line model air new remote release SAFE bC iauncher Strong Safe Ready4ogo anytime STRONG Safety pull-tested 125 lbs pressure strong enough iargest C/L airplanes SAFE Nasa built-in lock prevent accidental release IF NOT AT YOUR DEALER R DIRECT $5300sT CLAIR MODEL COMPONENTS P0 Box 5626 PP ndieUSAEugene OR 97405
Edition: Model Aviation - 1980/07
Page Numbers: 20, 21, 108
George Myers THE Coulomb meter batteries like bottles CocaColaR could look see much charge contain Theyre need another way assess state charge General Varionics Inc_10 Adelphi Drive Greenlawn NY 11740 offers new system purpose heart system device called Coulomb meter looks bit like thermometer since indicating ele ment bubble transparent electrolyte middle column mercury encased glass tube unit electrical charge named Coulomb specifies quantity charge conveyed current ampere acting second small current electricity flows through Coulomb meter bubble electrolyte migrates toward end column An electronic package samples current flow ing RC system provides controlling current Coulomb meter propor tioned both magnitude current time flows Thus meter indication represents integrated current X time sum charge has flowed past meter since last set zero true indicating bubble can move either way tube does important fact meter/cover assembly has plugged base unit us good base units let metering current flow out terminal other never let flow opposite direction Therefore bubble moves 0 end scale base unit toward 600 end bubble moves off 600 end scale either slide scale down until bubble over 0 again lift off meter/cover swap end-forend plug back base again General Varionics Inc offers three devices use coulomb meter indicator Minicycle battery discharger separate pair wires provided discharge time please packs made up 4 5 8 9 nickle cadmium cells fifth pair wires provided discharge 4-cell packs rated 1200 maH becoming popular Quarter Scale modelers device powered battery being discharged dont have plug wall motorcycle battery get work List price $3895 PlC 5000 device flies airplane can installed between switch hamess receiver read charge removed pack between receiver servo evaluate servos performance List price $2495 Unicycle 5000 battery charger/discharger plugs wall 4-cell flight packs 8-cell transmitter packs List price $5995 Ira Faberman visited sys tem middle wintertime chore testing batteries own connected Unicycle 5000 silver wire er wire ems observed lights worked Charging current 50 ma advertised Discharge current 275 ma 48 VDC momentary interruption circuit caused switch Charge mode Later measurements established dis charge current dropped battery terminal voltage dropped characteristic con stant-resistance discharging circuits Cutoff voltage flight pack discharge 40 VDC course week between-time testing 20 Model Aviation Coulomb meter lathe glass tube filled mercury arrow pointsto tne bubble electro lyte used indicator Regardless several General Varionics units installed first mounted protective covershown universal coverthen plugs devices described column Coulomb meter installed just above words MINI-CYCLE prototype unit movable scale forthe meter can seen through window meter/cover separate leads used discharging nickle-cadmium battery packs 4 5 8 cells George has installed PlC 5000 aileron extender cable red wires go junction white another green wire joins black negative ground wire receiver PlCs black wire joins separately black wire batterypack end adapter little care making connections goes long way toward preserving system reliability managed test flight pack sons have put adhesive labels showing date test results good time same equipment Next turned attention transmitter packs Unicycle 5000 set up discharge 8cell packs normallythough modifications test 9-cell packs Cox/Sanwa instance available special order using set up 8-cell packs cut off 80 VDC used Cox/Sanwa transmitters anyway cutoff 088 VDC per cell isnt likely cause trouble increase measured capacity negligible calibration meter remains valid Discharge current 320 ma instead 280 ma change isnt large enough damage anything found some bad cells test dont think makes sense fully discharge set time prepare recharge occasional testing definitely worthwhile rate tested battery packs replaced batteries necessary stuck labels packs indicating final test results date brought pack up full charge put things storage Ill recharge once month throughout winter season should too OK kind battery testing boring Minicycle Unicycle make bit less chore manually recorded amps time through exercise check various calibrations accumulate data usual way photos shows general set-up difference between sort battery cycling testing accustomed General Varionics system lies PlC 5000 Coulomb meter flies aircraft start freshly-charged batteries PlC 5000 set zero Knowing capacity established pack Minicycle Unicycle 5000 observe ter after flight see much charge has used can mount another PlC transmitter read charge removed its pack feel need Meter/covers interchangeable calibrations match within 2% may plug meter Minicycle Unicycle 5000 PlC 5000 should something unfor tunate happen instruction sheet shows cut system wiring installation PlC 5000 preferred cut aileron extension cable three reasons Plc 5000 can now installed between receiver servo first conven ient tool assessing hard particu lar servo working given instaliation flight Quarter Scale modelers should find application very interesting PlC 5000 can installed between switch harness receiver intended use allows see much charge remains flight pack calibration data tells much disconnected charger PlC 5000 can installed between charg ing jack battery cycler will allow assess charge remaining verify PlC 5000 calibration should observe following restrictions 1 Continuous discharge current must exceed 300 ma 2 Allow 08 VDC drop across PlC 5000 photos shows installed PlC 5000 helicopter position scale can examined before starting helicopter brings mind couple cautions PlC 5000 measures charge passes through let pack sit around week after charging before flying certain amount charge will leak between plates inside battery PlC 5000 wont know about wont compensate Cold packs give back part energy charged PlC 5000 compensated show loss available energy what did put flight pack outdoors 200F let cool down ran discharge calibration outdoors Minicycle made easy must protect meter vibration Never stick directly structure foam tape meter too delicate kind abuse Ill use rest space simulated Q & session Q Can Unicycle 5000 used charge trans mitter receiver simultaneously Yes Q Can Unicycle 5000 charge dis charge other simultaneously Yes Q What happens bubble moves way across window pull meter/cover straight up its held couple pins turn 180 degrees put back down Q What happens let bubble make way end tube buy another meter Note would have forget meter least twice before would happen New meters cost $4 Q Will Unicycle 5000 charge discharge batteries Wthe meter/cover missing Yes Q Can devices used 100 maH 2S0 maH packs Yes Realize 600 maH occupies scale space would very difficult see much change 1/6 5/l2ths inch total motion would get 100 250 maH packs manufacturer recommends use 450 600 maH packs Q What happens connect wires back wards charge will charge bat teries backwards can have diastrous effect discharge will take down batteries indicating thing meter voltagecutoff protection Please pay attention color code connect things correctly Q Do find meter hard read used magnifying glass Q Iflput PlC 5000 between switch har ness flight battery will charging current make meter run backwards No system protected against reverse cur rents Q If meter cover falls off piece metal shorts across exposed contacts will system damaged No Q What insertion impedance PlC 5000 shunted 47 mfd equates 1/g VDC drop two servos move Q How much current does PlC 5000 draw depends current drawn system Continued page 108 July 1980 21 set-up George used check out batteries Unicycle 5000 calibration ammeter stopwatch clipboard data log pocket calculator battery pack undertest pen Unicycle 5000 Duplicate job right yourselfl George has installed PlC 5000 Heliboy very important isolate meterelement possible sources vibration particu larly helicopters Winning Ideas FOURMOST RETRACTABLE VTOW HOOK RELEASE Price $575 Simplest reliable device available After line released hook retracts body unit leaving SMOOTH surface bottom aircraft No special attachments required N eight oz OTHER FOURMOST PRODUCTS 0491051 AIRFLO ENGINE MOUNT REDUCES DRAG VIBRATION FREE PRICE 250 40 AIRFLO ENGINE MOUNT IDEAL FOR QIJICKY 500 PRICE 525 RC TECHNIQUES/MYERS continued page 21 between 600 micro-amps 15 ma Q What happens system PlC 5000 fails integrated circuit meter base may fail open short open no change short internal diode will blow open less second Q What effect does temperature have unit No significant calibration change range 0 150 degrees F Q Is ultimate battery management system No cant handle quick-charging plc sooo wont pick up fact cell has short-circuited since last charging need expanded-scale voltmeter things tools used intelligence understanding PlC 5000 allows make measurement couldnt make before servo demand flight Q Whats difference between PlC 5000 transmitter receiver No difference PlC 5000 accepts voltages 35 18 VDC personal standards column require use thoroughly understand product before writing about and/or recommending case system flu gave DEPENDABLE Friend CIL Launching week spare time spend testing As result some discrepancies found manufacturer has corrected production models feel have contributed bit development products also feel know well enough say confidence conservatively-designed units work right cant find way can hurt Some readers have complained need footnotes understand what Im talking about technology has its jargon outside technology cant expected know what special words mean Therefore will time time print few definitions end column Heres first installment ma - milliamperes Electrical current flows rate measured Amperes Electronic circuits use such tiny flows convenience measuring use units 1/1000 large called milli 1/1000th amperes VDC Volts Direct Current pressure causes electrical current flow measured Volts Batteries provide push push direction years ago people decided call battery current Direct Current still diode device allows current flow direction can think electrical check-valve wish case PlC 5000 check-valve used tiny instead blocking incorrect current resulting short circuit melts down like fuse completely disconnecting circuit Thats enough month Keep letters flowing folks George Myers 70 Froehlich Farm Road Hicks ville NY 11801 RC SCALE/WISCHERS continued page 33 hurst New Jersey past summer fascinated performance Peter French Zlin 526 British Nats So much purchased kit have flying Saudi Arabia has wing span 86 does aerobatics powered 60 engine because weighs 8 2 Ibs no US kits market can compare British National Sport Scale event won Grumman Skyrocket five foot wingspan powered two OS Max 20s scale speed model should move across sky same speed its real counterpart appears moving far enough away appear same size Said another way model its real counterpart correct distances viewer appear same size should also covering same angular distance same amount time should wait until national-level competition impose flight realism would have time standards estab lished explained AMA rule book dont see increasing permissible engine size competition will encourage modelers built light As has previously discussed column no question planes low wing loadings can made operate scale speeds questionable however whether would find desirable since cant control wind velocity air density Reynolds numbers best can hope achieve illusion scale speed argument has going since started writing column 1980 AMA rule book will contain ajudges guide should helpful establishing realism speed related Bob andDolly Wischer Rt 1 S-221 Lapham Peak Road Delafield WI 53018 RC TOLEDO/BECKMAN continued page 11 addition 11-member Board Repre sentatives selected board includes members throughout US Cana da member France Due time space limitations its im possible cover everything see Toledo year Ill adding re ports regular column over next few months omissions certain ly intentional readers conve nience addresses suppliers ganizations mentioned follow Aero Plan 101 SW 2nd St Pompano Beach FL 33060 Balsa USA PO Box 164 Marinette WI 54143 Barrons Scale Classics 1213 Holly Spring Lane Grand Blanc Ml 48439 Bob Dively Model Aircraft Inc 28001 Cha grin Blvd Woodmere OH 44122 108 Model Aviation Fuel Fitting Sets Fuel Shut Off Fuel Manifold Gapless Hinges Gapless Hinge Slotter Strut Fairings Cockpit Coeming FUR~ST Send SASE Complete Information 4040 24th Ave Forest Grove OR 97116 PRODUCTS Phone 503 357-2732 AUDIO FLIGHT TIMER Prevents dead-stick landinas Generates incremental audio timing signals Ideal timing pattern flights giiaers Doass etc case less battery $2495 shipping Less case mounts transmitter $2195 shipping Write free brochure Industrial Inventions Inc RD2 463 US Route 1 Monmouth Jct New Jersey 08852 dont need cali friend time want get Control Line model air new remote release SAFE bC iauncher Strong Safe Ready4ogo anytime STRONG Safety pull-tested 125 lbs pressure strong enough iargest C/L airplanes SAFE Nasa built-in lock prevent accidental release IF NOT AT YOUR DEALER R DIRECT $5300sT CLAIR MODEL COMPONENTS P0 Box 5626 PP ndieUSAEugene OR 97405