George M Myer Radio HOW FAST turning months subject tachometers first remember using called Vibra-Tach looked like small X-Acto knife piece music wire extended end usually see blade use tool rested engine slid ring encircled handle back forth until free end music wire took up large oscillation body handle engraved rpm scale read step nearest position ring to let wire show wide vibration worked principle resonance mass length stiffness wire combined show wide vibration free part wire resonance engine several difficulties instrument among being finding access cowled engine unavoidable effects prop wash An improvement sorts made vibratingrod made areed like found harmonica group such reeds could mounted box protected reeds environment design called Frahm tachometer needed unique size reed indicate rpms measured worry about doubling situation wherein reed responds quite well rpm twice cut next design recall called Starrett tachometer Used primarily lathes milling machines set rpm work cutter device consisted rubber cup shaft worm gear pinion enclosed metal housing use pressed rubber cup against rotating element prop spinner instance put thumb over pinion gear point pinion gear malformed tooth caused pinion jump time tooth passed over worm gear could feel count number times occurred held Starrett tachometer against work counted jumps against stopwatch six seconds 101 ratio worm pinion counted six jumps six seconds calculated rpm lOx lOx 6 rpm pinion carried scale divided 10 major parts final disk reading O3thentherpmwas lOx 10x63 63OrpmIt handy tool shop much use modelers About 1940 Dr Edgerton MIT invented strobe light similar devices now used photographers Strob-O Tach flash repeated times per second flashing frequency carefully calibrated controllable over wide range painted distinctive mark rotating object pointed Strob-O-Tach As changed flashing frequency could make painted spot seem stand stillor move against known rotation device depended property human eye called persistence vision also subject doubling Since everything depended seeing object lighted strobe best results obtained dim light darkness properties plus fact tool expensive heavy bulky kept being used much modelers next significant device Heathkit Thumb-Tac aphototachometerwhich counted pulses sunlight reflected spin ner propeller blade pointed look through propeller disk photo tachometer could read dark shadow blade passage Housed sturdy metal case being relatively cheap Thumb-Tac quickly accepted widely used analog Continued page 22 Tachmaster II Accu-Tach 2 Top photo make good combination foryourfleld kit Theanalog Tachmaster ii gives quick rpm readings under variety conditions digital Accu-Tach resoives rpm smaiier rpm increment aiso providing ESV voltmeter ammeterfunctiofle Using soiderwickL makes removal parts printed circuit board relatively easy firattime use ityou will surprised cleanlyand quickly removes solder package #64-2090 local Radio Shack store TRC FastCharger R charges 10 cells series compromise two-ampere rate plugged automobiles cigar lighter should interesting Electric fliers because 12 Ah packs six seven eight cells commonly used propulsion charge rate four five amps would nice Electric would bit too much standard 500 mAh RC flight pack transmitter batteries 20 Model Aviation 90 Day WarraAty Twin Ball Bearing Crank Americas finest old-timer engine Originally designed Hassad & Havlik replica engine resonic tuning ensures continuous flow power through speed range Look out green goodbye red headT&Ds replica Sky Devil 65 $279 less coil cond & plug Caht rcsidcnts add 6% sales tax ORDIR DIRIiCT T&D RESEARCH AssocjAms 6371 El Cajon Blvd Suite 115 San Diego CA 9211S $1 FOR BROCHURE device indicating needle responded al immediately changes rpm settled quickly stable indication main problem Thumb-Tac its very small meter resulted 1000-rpm divisions 25000-rpm scale Royal soon brought out Pro-Tach analog device like Thumb-Tac Pro-Tach much larger meter five discrete 5000-rpm operating ranges selected five push buttons Rpm could read within 200 rpm Pro-Tach quickly grabbed high end model market three times price Heathkit did drive Thumb Tac off market Contemporary photo tachometer several motor/generator tachometers de sign simple parts easily obtained servo motor fitted rubber cup its shaft terminals motor connected voltmeter Servo motors contain permanent magnets therefore servo motor driven external power source will generate voltage varies almost linearly rpm primary objection other wise cheap practical design puts small load motor being measured consequently reduces rpm small amount advent digital computers technology involved gave rise hundreds integrated-circuit IC devices capable mea suring rpm digitally began see digital photo tachometers like Accu-Tach II primary urge toward digital devices ability resolve rpm accuracy part 1000a feat beyond capability expensive analog devices order keep price down levels analog devices digital units suffer long settling time customary digital photo tachometer take three five seconds change indication zero whatever final rpm will reach Three five seconds long enough time engine change rpm shadow cross sun operators hand shift units aiming point new position propeller Any events enough cause digital photo tachometer lose its count requiring start over again longer apparent settling time Making best use digital devices already present Accu-Tach people included no additional cost voltmeter VDC voltmeter-with-load similar ESV milliammeter measures 1999 amps must confess field kit has carrying both Heath Thumb-Tac Accu-Tach II several years far know Heathkit Thumb-Tac no longer available Accu-Tach II still avallable Nor-Cal Avionics PO Box 70956 Sunnyvale CA 94086 Now have Tachmaster II AceR/C Inc Box 511 Higginsville MO 64037 three-range version earlier Tacbmaster money makes excellent replace ment Thumb-Tac Being analog device snaps reading aimost instantly rpm meter provided three scales 0 5000 0 10000 0 25000 push button spring loaded Ofl activates instrument powered nine-volt dry battery slide switch selects range primary advantage TachmasterLL meter scale easier read Thumb-Tac cheaper Pro-Tach still has advantage push button-selected ranges Continued page 24 22 Model Aviation [DCO SKY D[VI[ 65 Ignition Approved TM Through modern technology have shed whole new light model airplane world U-TURN spinner barstock spinner precisely made tested speeds excess 36000 rpm registered virtually no run-out vibration conjunction its Ultra-Light design eliminates engine damage associated spinners currently market Best have produced superior spinner very affordable price Available standard sizes both 2- 4-stroke engines Try spinner once will agree way turn TRU-TURN spent pleasant two hours building kit Tachmaster II available kit well built-up calibrated tool would advise have ohmmeter available choose build kit because colored stripes very hard see o-watt resistors misinter preted several though using head band magnifier VOM saved having remove resistors soldered wrong place due misinterpreting color code brings mind another thought should have some solder wick handy whenever build electronic kit need to release component lay wick joint set soldering iron wick solder wick tube made braided fine copper wire sucks hot solder right out joint may seem bit peculiar compare optical tachometers old Heathkit Thumb-Tac Thumb-Tac has wide angle view its alignment tothe spinning propeller isnt critical Thumb-Tac also has built-in stand switch locks can set ground have both hands free controlling model has tiny meter makes precise measurements almost im possible Like put lot cash gadgets hobby use something find performs well enough earn endorse ment may say column same goes things sent now use Tachmaster II quick field readings because large black-on-white meter easier read Thumb-Tacs analog circuit gives nearly instantaneous read ings have added stand have changed DEALERS INQUIRIES WELCOMED push button On/Off type TRC Fast Charger intended used adjunct slow charger came radio system replacementfor will pump up pack has exhausted service about 30 minutes TRC Fast Charger plugs automobiles cigarlighter socket can connected starter battery wish However draws about 22 amps charging may drain want put starting battery connect power source polarity reversed will blow internal fuse instructions quite clear thing expected remain near charger operating provisos mind Ithink pretty good charger attractive feature charger doesnt care cells connected series chargingit will charge 12 cells series 15 VDC source 5ince will charging automobile normally charges maximum 144 VDC motor running better think terms 10 cells think handy charging electric airplane power packs up 10 cells series charger handles practically chores will charge singie-cell Ni-Liter flight packs transmitters Electric power packs like George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 responding advertisers mention read about Model Aviation 24 Model Aviation Available Local Hobby Shop Soon ROMCO MEG INC 713 943-1867 PO Box 836 So Houston TX 77587 MAKE YOUR DAY FUN. FLY SAFELY Carry Largest Only Stock Kratt Parts World aft alive working KRAFT MIDWEST LW HI/AT IX Authorized Warranty Service FREOUENCV CONVERSION aeon S25 alr 510S OIacOtAnt Dal oOnerlOnSc l ectrfl hnlng done apectnH~ anaIyee _____K-LINE Also Service AU in/C FutabaShack Only Full Time Servicenter Midwest 117 East Main St Northvil le Michigan 481 Phone 1-313-348-0085
Edition: Model Aviation - 1987/03
Page Numbers: 20, 22, 24
George M Myer Radio HOW FAST turning months subject tachometers first remember using called Vibra-Tach looked like small X-Acto knife piece music wire extended end usually see blade use tool rested engine slid ring encircled handle back forth until free end music wire took up large oscillation body handle engraved rpm scale read step nearest position ring to let wire show wide vibration worked principle resonance mass length stiffness wire combined show wide vibration free part wire resonance engine several difficulties instrument among being finding access cowled engine unavoidable effects prop wash An improvement sorts made vibratingrod made areed like found harmonica group such reeds could mounted box protected reeds environment design called Frahm tachometer needed unique size reed indicate rpms measured worry about doubling situation wherein reed responds quite well rpm twice cut next design recall called Starrett tachometer Used primarily lathes milling machines set rpm work cutter device consisted rubber cup shaft worm gear pinion enclosed metal housing use pressed rubber cup against rotating element prop spinner instance put thumb over pinion gear point pinion gear malformed tooth caused pinion jump time tooth passed over worm gear could feel count number times occurred held Starrett tachometer against work counted jumps against stopwatch six seconds 101 ratio worm pinion counted six jumps six seconds calculated rpm lOx lOx 6 rpm pinion carried scale divided 10 major parts final disk reading O3thentherpmwas lOx 10x63 63OrpmIt handy tool shop much use modelers About 1940 Dr Edgerton MIT invented strobe light similar devices now used photographers Strob-O Tach flash repeated times per second flashing frequency carefully calibrated controllable over wide range painted distinctive mark rotating object pointed Strob-O-Tach As changed flashing frequency could make painted spot seem stand stillor move against known rotation device depended property human eye called persistence vision also subject doubling Since everything depended seeing object lighted strobe best results obtained dim light darkness properties plus fact tool expensive heavy bulky kept being used much modelers next significant device Heathkit Thumb-Tac aphototachometerwhich counted pulses sunlight reflected spin ner propeller blade pointed look through propeller disk photo tachometer could read dark shadow blade passage Housed sturdy metal case being relatively cheap Thumb-Tac quickly accepted widely used analog Continued page 22 Tachmaster II Accu-Tach 2 Top photo make good combination foryourfleld kit Theanalog Tachmaster ii gives quick rpm readings under variety conditions digital Accu-Tach resoives rpm smaiier rpm increment aiso providing ESV voltmeter ammeterfunctiofle Using soiderwickL makes removal parts printed circuit board relatively easy firattime use ityou will surprised cleanlyand quickly removes solder package #64-2090 local Radio Shack store TRC FastCharger R charges 10 cells series compromise two-ampere rate plugged automobiles cigar lighter should interesting Electric fliers because 12 Ah packs six seven eight cells commonly used propulsion charge rate four five amps would nice Electric would bit too much standard 500 mAh RC flight pack transmitter batteries 20 Model Aviation 90 Day WarraAty Twin Ball Bearing Crank Americas finest old-timer engine Originally designed Hassad & Havlik replica engine resonic tuning ensures continuous flow power through speed range Look out green goodbye red headT&Ds replica Sky Devil 65 $279 less coil cond & plug Caht rcsidcnts add 6% sales tax ORDIR DIRIiCT T&D RESEARCH AssocjAms 6371 El Cajon Blvd Suite 115 San Diego CA 9211S $1 FOR BROCHURE device indicating needle responded al immediately changes rpm settled quickly stable indication main problem Thumb-Tac its very small meter resulted 1000-rpm divisions 25000-rpm scale Royal soon brought out Pro-Tach analog device like Thumb-Tac Pro-Tach much larger meter five discrete 5000-rpm operating ranges selected five push buttons Rpm could read within 200 rpm Pro-Tach quickly grabbed high end model market three times price Heathkit did drive Thumb Tac off market Contemporary photo tachometer several motor/generator tachometers de sign simple parts easily obtained servo motor fitted rubber cup its shaft terminals motor connected voltmeter Servo motors contain permanent magnets therefore servo motor driven external power source will generate voltage varies almost linearly rpm primary objection other wise cheap practical design puts small load motor being measured consequently reduces rpm small amount advent digital computers technology involved gave rise hundreds integrated-circuit IC devices capable mea suring rpm digitally began see digital photo tachometers like Accu-Tach II primary urge toward digital devices ability resolve rpm accuracy part 1000a feat beyond capability expensive analog devices order keep price down levels analog devices digital units suffer long settling time customary digital photo tachometer take three five seconds change indication zero whatever final rpm will reach Three five seconds long enough time engine change rpm shadow cross sun operators hand shift units aiming point new position propeller Any events enough cause digital photo tachometer lose its count requiring start over again longer apparent settling time Making best use digital devices already present Accu-Tach people included no additional cost voltmeter VDC voltmeter-with-load similar ESV milliammeter measures 1999 amps must confess field kit has carrying both Heath Thumb-Tac Accu-Tach II several years far know Heathkit Thumb-Tac no longer available Accu-Tach II still avallable Nor-Cal Avionics PO Box 70956 Sunnyvale CA 94086 Now have Tachmaster II AceR/C Inc Box 511 Higginsville MO 64037 three-range version earlier Tacbmaster money makes excellent replace ment Thumb-Tac Being analog device snaps reading aimost instantly rpm meter provided three scales 0 5000 0 10000 0 25000 push button spring loaded Ofl activates instrument powered nine-volt dry battery slide switch selects range primary advantage TachmasterLL meter scale easier read Thumb-Tac cheaper Pro-Tach still has advantage push button-selected ranges Continued page 24 22 Model Aviation [DCO SKY D[VI[ 65 Ignition Approved TM Through modern technology have shed whole new light model airplane world U-TURN spinner barstock spinner precisely made tested speeds excess 36000 rpm registered virtually no run-out vibration conjunction its Ultra-Light design eliminates engine damage associated spinners currently market Best have produced superior spinner very affordable price Available standard sizes both 2- 4-stroke engines Try spinner once will agree way turn TRU-TURN spent pleasant two hours building kit Tachmaster II available kit well built-up calibrated tool would advise have ohmmeter available choose build kit because colored stripes very hard see o-watt resistors misinter preted several though using head band magnifier VOM saved having remove resistors soldered wrong place due misinterpreting color code brings mind another thought should have some solder wick handy whenever build electronic kit need to release component lay wick joint set soldering iron wick solder wick tube made braided fine copper wire sucks hot solder right out joint may seem bit peculiar compare optical tachometers old Heathkit Thumb-Tac Thumb-Tac has wide angle view its alignment tothe spinning propeller isnt critical Thumb-Tac also has built-in stand switch locks can set ground have both hands free controlling model has tiny meter makes precise measurements almost im possible Like put lot cash gadgets hobby use something find performs well enough earn endorse ment may say column same goes things sent now use Tachmaster II quick field readings because large black-on-white meter easier read Thumb-Tacs analog circuit gives nearly instantaneous read ings have added stand have changed DEALERS INQUIRIES WELCOMED push button On/Off type TRC Fast Charger intended used adjunct slow charger came radio system replacementfor will pump up pack has exhausted service about 30 minutes TRC Fast Charger plugs automobiles cigarlighter socket can connected starter battery wish However draws about 22 amps charging may drain want put starting battery connect power source polarity reversed will blow internal fuse instructions quite clear thing expected remain near charger operating provisos mind Ithink pretty good charger attractive feature charger doesnt care cells connected series chargingit will charge 12 cells series 15 VDC source 5ince will charging automobile normally charges maximum 144 VDC motor running better think terms 10 cells think handy charging electric airplane power packs up 10 cells series charger handles practically chores will charge singie-cell Ni-Liter flight packs transmitters Electric power packs like George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 responding advertisers mention read about Model Aviation 24 Model Aviation Available Local Hobby Shop Soon ROMCO MEG INC 713 943-1867 PO Box 836 So Houston TX 77587 MAKE YOUR DAY FUN. FLY SAFELY Carry Largest Only Stock Kratt Parts World aft alive working KRAFT MIDWEST LW HI/AT IX Authorized Warranty Service FREOUENCV CONVERSION aeon S25 alr 510S OIacOtAnt Dal oOnerlOnSc l ectrfl hnlng done apectnH~ anaIyee _____K-LINE Also Service AU in/C FutabaShack Only Full Time Servicenter Midwest 117 East Main St Northvil le Michigan 481 Phone 1-313-348-0085
Edition: Model Aviation - 1987/03
Page Numbers: 20, 22, 24
George M Myer Radio HOW FAST turning months subject tachometers first remember using called Vibra-Tach looked like small X-Acto knife piece music wire extended end usually see blade use tool rested engine slid ring encircled handle back forth until free end music wire took up large oscillation body handle engraved rpm scale read step nearest position ring to let wire show wide vibration worked principle resonance mass length stiffness wire combined show wide vibration free part wire resonance engine several difficulties instrument among being finding access cowled engine unavoidable effects prop wash An improvement sorts made vibratingrod made areed like found harmonica group such reeds could mounted box protected reeds environment design called Frahm tachometer needed unique size reed indicate rpms measured worry about doubling situation wherein reed responds quite well rpm twice cut next design recall called Starrett tachometer Used primarily lathes milling machines set rpm work cutter device consisted rubber cup shaft worm gear pinion enclosed metal housing use pressed rubber cup against rotating element prop spinner instance put thumb over pinion gear point pinion gear malformed tooth caused pinion jump time tooth passed over worm gear could feel count number times occurred held Starrett tachometer against work counted jumps against stopwatch six seconds 101 ratio worm pinion counted six jumps six seconds calculated rpm lOx lOx 6 rpm pinion carried scale divided 10 major parts final disk reading O3thentherpmwas lOx 10x63 63OrpmIt handy tool shop much use modelers About 1940 Dr Edgerton MIT invented strobe light similar devices now used photographers Strob-O Tach flash repeated times per second flashing frequency carefully calibrated controllable over wide range painted distinctive mark rotating object pointed Strob-O-Tach As changed flashing frequency could make painted spot seem stand stillor move against known rotation device depended property human eye called persistence vision also subject doubling Since everything depended seeing object lighted strobe best results obtained dim light darkness properties plus fact tool expensive heavy bulky kept being used much modelers next significant device Heathkit Thumb-Tac aphototachometerwhich counted pulses sunlight reflected spin ner propeller blade pointed look through propeller disk photo tachometer could read dark shadow blade passage Housed sturdy metal case being relatively cheap Thumb-Tac quickly accepted widely used analog Continued page 22 Tachmaster II Accu-Tach 2 Top photo make good combination foryourfleld kit Theanalog Tachmaster ii gives quick rpm readings under variety conditions digital Accu-Tach resoives rpm smaiier rpm increment aiso providing ESV voltmeter ammeterfunctiofle Using soiderwickL makes removal parts printed circuit board relatively easy firattime use ityou will surprised cleanlyand quickly removes solder package #64-2090 local Radio Shack store TRC FastCharger R charges 10 cells series compromise two-ampere rate plugged automobiles cigar lighter should interesting Electric fliers because 12 Ah packs six seven eight cells commonly used propulsion charge rate four five amps would nice Electric would bit too much standard 500 mAh RC flight pack transmitter batteries 20 Model Aviation 90 Day WarraAty Twin Ball Bearing Crank Americas finest old-timer engine Originally designed Hassad & Havlik replica engine resonic tuning ensures continuous flow power through speed range Look out green goodbye red headT&Ds replica Sky Devil 65 $279 less coil cond & plug Caht rcsidcnts add 6% sales tax ORDIR DIRIiCT T&D RESEARCH AssocjAms 6371 El Cajon Blvd Suite 115 San Diego CA 9211S $1 FOR BROCHURE device indicating needle responded al immediately changes rpm settled quickly stable indication main problem Thumb-Tac its very small meter resulted 1000-rpm divisions 25000-rpm scale Royal soon brought out Pro-Tach analog device like Thumb-Tac Pro-Tach much larger meter five discrete 5000-rpm operating ranges selected five push buttons Rpm could read within 200 rpm Pro-Tach quickly grabbed high end model market three times price Heathkit did drive Thumb Tac off market Contemporary photo tachometer several motor/generator tachometers de sign simple parts easily obtained servo motor fitted rubber cup its shaft terminals motor connected voltmeter Servo motors contain permanent magnets therefore servo motor driven external power source will generate voltage varies almost linearly rpm primary objection other wise cheap practical design puts small load motor being measured consequently reduces rpm small amount advent digital computers technology involved gave rise hundreds integrated-circuit IC devices capable mea suring rpm digitally began see digital photo tachometers like Accu-Tach II primary urge toward digital devices ability resolve rpm accuracy part 1000a feat beyond capability expensive analog devices order keep price down levels analog devices digital units suffer long settling time customary digital photo tachometer take three five seconds change indication zero whatever final rpm will reach Three five seconds long enough time engine change rpm shadow cross sun operators hand shift units aiming point new position propeller Any events enough cause digital photo tachometer lose its count requiring start over again longer apparent settling time Making best use digital devices already present Accu-Tach people included no additional cost voltmeter VDC voltmeter-with-load similar ESV milliammeter measures 1999 amps must confess field kit has carrying both Heath Thumb-Tac Accu-Tach II several years far know Heathkit Thumb-Tac no longer available Accu-Tach II still avallable Nor-Cal Avionics PO Box 70956 Sunnyvale CA 94086 Now have Tachmaster II AceR/C Inc Box 511 Higginsville MO 64037 three-range version earlier Tacbmaster money makes excellent replace ment Thumb-Tac Being analog device snaps reading aimost instantly rpm meter provided three scales 0 5000 0 10000 0 25000 push button spring loaded Ofl activates instrument powered nine-volt dry battery slide switch selects range primary advantage TachmasterLL meter scale easier read Thumb-Tac cheaper Pro-Tach still has advantage push button-selected ranges Continued page 24 22 Model Aviation [DCO SKY D[VI[ 65 Ignition Approved TM Through modern technology have shed whole new light model airplane world U-TURN spinner barstock spinner precisely made tested speeds excess 36000 rpm registered virtually no run-out vibration conjunction its Ultra-Light design eliminates engine damage associated spinners currently market Best have produced superior spinner very affordable price Available standard sizes both 2- 4-stroke engines Try spinner once will agree way turn TRU-TURN spent pleasant two hours building kit Tachmaster II available kit well built-up calibrated tool would advise have ohmmeter available choose build kit because colored stripes very hard see o-watt resistors misinter preted several though using head band magnifier VOM saved having remove resistors soldered wrong place due misinterpreting color code brings mind another thought should have some solder wick handy whenever build electronic kit need to release component lay wick joint set soldering iron wick solder wick tube made braided fine copper wire sucks hot solder right out joint may seem bit peculiar compare optical tachometers old Heathkit Thumb-Tac Thumb-Tac has wide angle view its alignment tothe spinning propeller isnt critical Thumb-Tac also has built-in stand switch locks can set ground have both hands free controlling model has tiny meter makes precise measurements almost im possible Like put lot cash gadgets hobby use something find performs well enough earn endorse ment may say column same goes things sent now use Tachmaster II quick field readings because large black-on-white meter easier read Thumb-Tacs analog circuit gives nearly instantaneous read ings have added stand have changed DEALERS INQUIRIES WELCOMED push button On/Off type TRC Fast Charger intended used adjunct slow charger came radio system replacementfor will pump up pack has exhausted service about 30 minutes TRC Fast Charger plugs automobiles cigarlighter socket can connected starter battery wish However draws about 22 amps charging may drain want put starting battery connect power source polarity reversed will blow internal fuse instructions quite clear thing expected remain near charger operating provisos mind Ithink pretty good charger attractive feature charger doesnt care cells connected series chargingit will charge 12 cells series 15 VDC source 5ince will charging automobile normally charges maximum 144 VDC motor running better think terms 10 cells think handy charging electric airplane power packs up 10 cells series charger handles practically chores will charge singie-cell Ni-Liter flight packs transmitters Electric power packs like George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 responding advertisers mention read about Model Aviation 24 Model Aviation Available Local Hobby Shop Soon ROMCO MEG INC 713 943-1867 PO Box 836 So Houston TX 77587 MAKE YOUR DAY FUN. FLY SAFELY Carry Largest Only Stock Kratt Parts World aft alive working KRAFT MIDWEST LW HI/AT IX Authorized Warranty Service FREOUENCV CONVERSION aeon S25 alr 510S OIacOtAnt Dal oOnerlOnSc l ectrfl hnlng done apectnH~ anaIyee _____K-LINE Also Service AU in/C FutabaShack Only Full Time Servicenter Midwest 117 East Main St Northvil le Michigan 481 Phone 1-313-348-0085