RADIO CONTROL ELECTRICS 1I THIS COLUMN WILL discuss some new products sources B-information small servos small airplanes ezonemagcom very popular site Web dedicated B-aeromodeling perhaps best described online magazine Ed Bourke modeler behind free adventure month posts new issue enjoy site offers things might expect find conventional magazines except E-related also offers ready avallability past issue info links other B-areas interest some advertising site sometimes on-line product specials Ive visited site regularity because dont want because dont want get fired now feel little brave venture online B-fun hoping Big Brother watching work line time guess someday Ill just have get own home-based facility Meanwhile know already equipped youve yet ventured ezonemag site encourage soon Another site may want visit www thunteknetlpcmodels location Pats Custom Models Pat Tritle responsible modeler offers plans other items including custom building services Pats line includes stuff very wide range aeromodeling interest including Free Flight rubber Giant Scale much between photo shows two available WW II designs equipped Magnetic Meyhem power systems 10 cells can obtain catalog info sending SASE Pats Custom Models 10313 Snowheights Blvd NB Albuquerque NM 5 April 1999 107 FMA 580 SERVO INPUT CURRENT FOR COND / HALF CYCLE AND /-45 DEGREE THROW 1600 1400 1200 g 1000 2 W 800 0 600 0 400 Co 200 0 -200 012 SECONDS FMA 590 SERVO INPUT CURRENT FOR COND HALF CYCLE AND 1-45 DEGREE THROW 1600 1400 1200 2 W o 600 0 400 w Co 200 0 -200 012 SECONDS VOLTIposSERVO CYCLER NI e MA Sept 1998 TO COMPUTER PARALLEL PORT TEST SETUP TO DISPLAY CAPTURE AND STORE SERVO INPUT CURRENT WAVEFORM DATA 87112-3054 Tel 505 296-4511 Bmail pcmodels@thunteknet Small airplanes everywhere continues booming area interest within Electric within other modeling areas well recently saw two products dedicated small end modeling thought would interest Texas Tips video Robins View Productions Box 68 Stockertown PA 18083 Tel [610] 746-0106 Familiar modeler CL champion Bob Hunt man behind camera presents easygoing Randy Randolph shop showing modelers some neat building things cially small models Most modelers have seen Randys writings magazine Now can see man action tape sells $1395 Priority Mail $3 Don Ross 38 Churchill Rd Cresskill NJ 07626 Tel [201] 568-5272 has recently released second two books entitled Flying Models Rubber C02 Electric & Micro Radio Control book jammed lots very useful info especially small models 15 nicely presented chapters covering 240 pages read like everything ever wanted know ice $1995 shipping Book Thats entitled Rubber Powered Model Airplanes intend pick up too November 98 column included discussion popular Speed 400-size smaller airplanes equipment column offered some thoughts about speed controls models particular trend toward physically smaller smaller controls concern about heat-dissipating ability concern BEC portion ESC because generalization overall physical size goes down unit will operate hotter Often regulator IC used BEC function has automatic shutdown features should get too hot losing radio can troubling consequence say least discussion explained BEC regulator gets hot different servos affect practical purposes its servo load current dominates major BEC power dissipation source causes heat affected number servos mechanical load including operational quality linkages extent kept motion throughout flight column included table listed peak average servo currents variety servos measurements made using home-brew device designed built purpose RC System Analyzer Information displayed DVM pictured column Two popular servos airplanes FMA S80 S90 two servos physically same size mounting requirements However S90 internally different faster has higher torque course takes current since output performance does come free also noted much harder small BEC-equipped ESCs because higher current demands purchased some new test equipment Velleman PCS64i PC Scope Digital Storage Oscilloscope adapter PC instrument converts ordinary personal computer storage oscilloscope data recorder spectrum analyzer based mathematical manipulations first thing did new toy measure some servo performance new instrument allows verify peak servo currents previously measured measure speed servo test hookup used shown accompanying figure follows set up Servo Cycler MA September 1998 bang bang operation about two seconds per cycle set Sweep Width servo arm motion about 450 As shown figure PCS64i connected observe servo input current via precision 1 ohm sampling resistor negative battery lead Servo Cycler power 48 volt Ni-Cd photo shows complete test setup accompanying graphics show servo current waveforms cycle ie back forth captured fly PCS64i numeric data collected PCS64i saved imported spreadsheet make graphic presentation S80 S90 input current graphs show actual dynamic servo input current following two commands ie back forth Servo Cycler what would happen quickly move transmitter stick limit-to-limit back again holding limit position about second current burst begins signal stick command lasts short time compared second servo rests limit position servo current very good indicator beginning end motor operation its clear both servos moving settling much faster chosen cycle time display shows motor current dynamics also actual servo speed better understand graphs consider S80 graph current burst lasts about 4 second spikey appearance current associated initial motor run get servo going some settling spikes servo homes its new positional resting place During time highest recorded current peak displayed graph about 820 milliAmps agreement 860 mA peak reported November issue slightly different battery voltage could easily account difference Now compare S90 data above First everything happens faster recorded current burst durations 25 second long less clear indication S90 quite bit faster S80 above servo input peak currents higher reaching about 13 Amps Again result compares favorably November column data 128 Amps Both current measurements show simply cant get something nothing S90 peak current about 1300/820 imes S80 value its quite clear latter servos harder tiny ESC BECs theres Ive heard several sources modelers modifying 590s make life easier ESCs particular some 108 Model Aviation WW II designs available Pats Custom Models Geared Magnetic Mayhems 10 cells good combination Catalog info address text. Setup capturing displaying servo input current being swept bang-bang Servo Cycler Velleman PCS64i Digital Storage Scope interfaces computer installing tiny low-value resistors series S90 motors limit higher motor currents associated latter Ive tried its clear easy probably past ability resources modelers fundamentally Im troubled folks bother approach first place rocket science just use S80 instead Theres no point can see paying higher performance S90 servos cutting back performance resistance modification theres have S8Os S9Os Based servos have S8Os simply work better S9Os beyond high input current peaks latter S8Os have much less deadband S9Os Deadband servo characteristic best visualized moving transmitter stick slowly direction reversing direction moving slowly other way Deadband shows up stick moves servo doesnt seen right stick reversal point Try SSOs like will follow stick much closely S9Os Comparatively speaking S9Os sloppy compared S8Os fact dont want fly deadband shows up flight performance Deadband largely determined amplifier electronics offhand see no reason matter cant fixed design adjustment As time goes opportunity presents itself Ill recheck newer versions both servos see design changes show up Im also anxious test some Hitec HS 50 feather servos same manner Meanwhile since Id much rather fly tighter servos dont need higher speed torque smaller airplanes dont want unnecessarily overheat ESCs Im staying S8Os Thus ends monthly column Please enclose SASE correspondence youd like reply please continue enjoy high-flying quiet fun Electric brings l 1999 109
Edition: Model Aviation - 1999/04
Page Numbers: 107, 108, 109
Edition: Model Aviation - 1999/04
Page Numbers: 107, 108, 109
RADIO CONTROL ELECTRICS 1I THIS COLUMN WILL discuss some new products sources B-information small servos small airplanes ezonemagcom very popular site Web dedicated B-aeromodeling perhaps best described online magazine Ed Bourke modeler behind free adventure month posts new issue enjoy site offers things might expect find conventional magazines except E-related also offers ready avallability past issue info links other B-areas interest some advertising site sometimes on-line product specials Ive visited site regularity because dont want because dont want get fired now feel little brave venture online B-fun hoping Big Brother watching work line time guess someday Ill just have get own home-based facility Meanwhile know already equipped youve yet ventured ezonemag site encourage soon Another site may want visit www thunteknetlpcmodels location Pats Custom Models Pat Tritle responsible modeler offers plans other items including custom building services Pats line includes stuff very wide range aeromodeling interest including Free Flight rubber Giant Scale much between photo shows two available WW II designs equipped Magnetic Meyhem power systems 10 cells can obtain catalog info sending SASE Pats Custom Models 10313 Snowheights Blvd NB Albuquerque NM 5 April 1999 107 FMA 580 SERVO INPUT CURRENT FOR COND / HALF CYCLE AND /-45 DEGREE THROW 1600 1400 1200 g 1000 2 W 800 0 600 0 400 Co 200 0 -200 012 SECONDS FMA 590 SERVO INPUT CURRENT FOR COND HALF CYCLE AND 1-45 DEGREE THROW 1600 1400 1200 2 W o 600 0 400 w Co 200 0 -200 012 SECONDS VOLTIposSERVO CYCLER NI e MA Sept 1998 TO COMPUTER PARALLEL PORT TEST SETUP TO DISPLAY CAPTURE AND STORE SERVO INPUT CURRENT WAVEFORM DATA 87112-3054 Tel 505 296-4511 Bmail pcmodels@thunteknet Small airplanes everywhere continues booming area interest within Electric within other modeling areas well recently saw two products dedicated small end modeling thought would interest Texas Tips video Robins View Productions Box 68 Stockertown PA 18083 Tel [610] 746-0106 Familiar modeler CL champion Bob Hunt man behind camera presents easygoing Randy Randolph shop showing modelers some neat building things cially small models Most modelers have seen Randys writings magazine Now can see man action tape sells $1395 Priority Mail $3 Don Ross 38 Churchill Rd Cresskill NJ 07626 Tel [201] 568-5272 has recently released second two books entitled Flying Models Rubber C02 Electric & Micro Radio Control book jammed lots very useful info especially small models 15 nicely presented chapters covering 240 pages read like everything ever wanted know ice $1995 shipping Book Thats entitled Rubber Powered Model Airplanes intend pick up too November 98 column included discussion popular Speed 400-size smaller airplanes equipment column offered some thoughts about speed controls models particular trend toward physically smaller smaller controls concern about heat-dissipating ability concern BEC portion ESC because generalization overall physical size goes down unit will operate hotter Often regulator IC used BEC function has automatic shutdown features should get too hot losing radio can troubling consequence say least discussion explained BEC regulator gets hot different servos affect practical purposes its servo load current dominates major BEC power dissipation source causes heat affected number servos mechanical load including operational quality linkages extent kept motion throughout flight column included table listed peak average servo currents variety servos measurements made using home-brew device designed built purpose RC System Analyzer Information displayed DVM pictured column Two popular servos airplanes FMA S80 S90 two servos physically same size mounting requirements However S90 internally different faster has higher torque course takes current since output performance does come free also noted much harder small BEC-equipped ESCs because higher current demands purchased some new test equipment Velleman PCS64i PC Scope Digital Storage Oscilloscope adapter PC instrument converts ordinary personal computer storage oscilloscope data recorder spectrum analyzer based mathematical manipulations first thing did new toy measure some servo performance new instrument allows verify peak servo currents previously measured measure speed servo test hookup used shown accompanying figure follows set up Servo Cycler MA September 1998 bang bang operation about two seconds per cycle set Sweep Width servo arm motion about 450 As shown figure PCS64i connected observe servo input current via precision 1 ohm sampling resistor negative battery lead Servo Cycler power 48 volt Ni-Cd photo shows complete test setup accompanying graphics show servo current waveforms cycle ie back forth captured fly PCS64i numeric data collected PCS64i saved imported spreadsheet make graphic presentation S80 S90 input current graphs show actual dynamic servo input current following two commands ie back forth Servo Cycler what would happen quickly move transmitter stick limit-to-limit back again holding limit position about second current burst begins signal stick command lasts short time compared second servo rests limit position servo current very good indicator beginning end motor operation its clear both servos moving settling much faster chosen cycle time display shows motor current dynamics also actual servo speed better understand graphs consider S80 graph current burst lasts about 4 second spikey appearance current associated initial motor run get servo going some settling spikes servo homes its new positional resting place During time highest recorded current peak displayed graph about 820 milliAmps agreement 860 mA peak reported November issue slightly different battery voltage could easily account difference Now compare S90 data above First everything happens faster recorded current burst durations 25 second long less clear indication S90 quite bit faster S80 above servo input peak currents higher reaching about 13 Amps Again result compares favorably November column data 128 Amps Both current measurements show simply cant get something nothing S90 peak current about 1300/820 imes S80 value its quite clear latter servos harder tiny ESC BECs theres Ive heard several sources modelers modifying 590s make life easier ESCs particular some 108 Model Aviation WW II designs available Pats Custom Models Geared Magnetic Mayhems 10 cells good combination Catalog info address text. Setup capturing displaying servo input current being swept bang-bang Servo Cycler Velleman PCS64i Digital Storage Scope interfaces computer installing tiny low-value resistors series S90 motors limit higher motor currents associated latter Ive tried its clear easy probably past ability resources modelers fundamentally Im troubled folks bother approach first place rocket science just use S80 instead Theres no point can see paying higher performance S90 servos cutting back performance resistance modification theres have S8Os S9Os Based servos have S8Os simply work better S9Os beyond high input current peaks latter S8Os have much less deadband S9Os Deadband servo characteristic best visualized moving transmitter stick slowly direction reversing direction moving slowly other way Deadband shows up stick moves servo doesnt seen right stick reversal point Try SSOs like will follow stick much closely S9Os Comparatively speaking S9Os sloppy compared S8Os fact dont want fly deadband shows up flight performance Deadband largely determined amplifier electronics offhand see no reason matter cant fixed design adjustment As time goes opportunity presents itself Ill recheck newer versions both servos see design changes show up Im also anxious test some Hitec HS 50 feather servos same manner Meanwhile since Id much rather fly tighter servos dont need higher speed torque smaller airplanes dont want unnecessarily overheat ESCs Im staying S8Os Thus ends monthly column Please enclose SASE correspondence youd like reply please continue enjoy high-flying quiet fun Electric brings l 1999 109
Edition: Model Aviation - 1999/04
Page Numbers: 107, 108, 109
RADIO CONTROL ELECTRICS 1I THIS COLUMN WILL discuss some new products sources B-information small servos small airplanes ezonemagcom very popular site Web dedicated B-aeromodeling perhaps best described online magazine Ed Bourke modeler behind free adventure month posts new issue enjoy site offers things might expect find conventional magazines except E-related also offers ready avallability past issue info links other B-areas interest some advertising site sometimes on-line product specials Ive visited site regularity because dont want because dont want get fired now feel little brave venture online B-fun hoping Big Brother watching work line time guess someday Ill just have get own home-based facility Meanwhile know already equipped youve yet ventured ezonemag site encourage soon Another site may want visit www thunteknetlpcmodels location Pats Custom Models Pat Tritle responsible modeler offers plans other items including custom building services Pats line includes stuff very wide range aeromodeling interest including Free Flight rubber Giant Scale much between photo shows two available WW II designs equipped Magnetic Meyhem power systems 10 cells can obtain catalog info sending SASE Pats Custom Models 10313 Snowheights Blvd NB Albuquerque NM 5 April 1999 107 FMA 580 SERVO INPUT CURRENT FOR COND / HALF CYCLE AND /-45 DEGREE THROW 1600 1400 1200 g 1000 2 W 800 0 600 0 400 Co 200 0 -200 012 SECONDS FMA 590 SERVO INPUT CURRENT FOR COND HALF CYCLE AND 1-45 DEGREE THROW 1600 1400 1200 2 W o 600 0 400 w Co 200 0 -200 012 SECONDS VOLTIposSERVO CYCLER NI e MA Sept 1998 TO COMPUTER PARALLEL PORT TEST SETUP TO DISPLAY CAPTURE AND STORE SERVO INPUT CURRENT WAVEFORM DATA 87112-3054 Tel 505 296-4511 Bmail pcmodels@thunteknet Small airplanes everywhere continues booming area interest within Electric within other modeling areas well recently saw two products dedicated small end modeling thought would interest Texas Tips video Robins View Productions Box 68 Stockertown PA 18083 Tel [610] 746-0106 Familiar modeler CL champion Bob Hunt man behind camera presents easygoing Randy Randolph shop showing modelers some neat building things cially small models Most modelers have seen Randys writings magazine Now can see man action tape sells $1395 Priority Mail $3 Don Ross 38 Churchill Rd Cresskill NJ 07626 Tel [201] 568-5272 has recently released second two books entitled Flying Models Rubber C02 Electric & Micro Radio Control book jammed lots very useful info especially small models 15 nicely presented chapters covering 240 pages read like everything ever wanted know ice $1995 shipping Book Thats entitled Rubber Powered Model Airplanes intend pick up too November 98 column included discussion popular Speed 400-size smaller airplanes equipment column offered some thoughts about speed controls models particular trend toward physically smaller smaller controls concern about heat-dissipating ability concern BEC portion ESC because generalization overall physical size goes down unit will operate hotter Often regulator IC used BEC function has automatic shutdown features should get too hot losing radio can troubling consequence say least discussion explained BEC regulator gets hot different servos affect practical purposes its servo load current dominates major BEC power dissipation source causes heat affected number servos mechanical load including operational quality linkages extent kept motion throughout flight column included table listed peak average servo currents variety servos measurements made using home-brew device designed built purpose RC System Analyzer Information displayed DVM pictured column Two popular servos airplanes FMA S80 S90 two servos physically same size mounting requirements However S90 internally different faster has higher torque course takes current since output performance does come free also noted much harder small BEC-equipped ESCs because higher current demands purchased some new test equipment Velleman PCS64i PC Scope Digital Storage Oscilloscope adapter PC instrument converts ordinary personal computer storage oscilloscope data recorder spectrum analyzer based mathematical manipulations first thing did new toy measure some servo performance new instrument allows verify peak servo currents previously measured measure speed servo test hookup used shown accompanying figure follows set up Servo Cycler MA September 1998 bang bang operation about two seconds per cycle set Sweep Width servo arm motion about 450 As shown figure PCS64i connected observe servo input current via precision 1 ohm sampling resistor negative battery lead Servo Cycler power 48 volt Ni-Cd photo shows complete test setup accompanying graphics show servo current waveforms cycle ie back forth captured fly PCS64i numeric data collected PCS64i saved imported spreadsheet make graphic presentation S80 S90 input current graphs show actual dynamic servo input current following two commands ie back forth Servo Cycler what would happen quickly move transmitter stick limit-to-limit back again holding limit position about second current burst begins signal stick command lasts short time compared second servo rests limit position servo current very good indicator beginning end motor operation its clear both servos moving settling much faster chosen cycle time display shows motor current dynamics also actual servo speed better understand graphs consider S80 graph current burst lasts about 4 second spikey appearance current associated initial motor run get servo going some settling spikes servo homes its new positional resting place During time highest recorded current peak displayed graph about 820 milliAmps agreement 860 mA peak reported November issue slightly different battery voltage could easily account difference Now compare S90 data above First everything happens faster recorded current burst durations 25 second long less clear indication S90 quite bit faster S80 above servo input peak currents higher reaching about 13 Amps Again result compares favorably November column data 128 Amps Both current measurements show simply cant get something nothing S90 peak current about 1300/820 imes S80 value its quite clear latter servos harder tiny ESC BECs theres Ive heard several sources modelers modifying 590s make life easier ESCs particular some 108 Model Aviation WW II designs available Pats Custom Models Geared Magnetic Mayhems 10 cells good combination Catalog info address text. Setup capturing displaying servo input current being swept bang-bang Servo Cycler Velleman PCS64i Digital Storage Scope interfaces computer installing tiny low-value resistors series S90 motors limit higher motor currents associated latter Ive tried its clear easy probably past ability resources modelers fundamentally Im troubled folks bother approach first place rocket science just use S80 instead Theres no point can see paying higher performance S90 servos cutting back performance resistance modification theres have S8Os S9Os Based servos have S8Os simply work better S9Os beyond high input current peaks latter S8Os have much less deadband S9Os Deadband servo characteristic best visualized moving transmitter stick slowly direction reversing direction moving slowly other way Deadband shows up stick moves servo doesnt seen right stick reversal point Try SSOs like will follow stick much closely S9Os Comparatively speaking S9Os sloppy compared S8Os fact dont want fly deadband shows up flight performance Deadband largely determined amplifier electronics offhand see no reason matter cant fixed design adjustment As time goes opportunity presents itself Ill recheck newer versions both servos see design changes show up Im also anxious test some Hitec HS 50 feather servos same manner Meanwhile since Id much rather fly tighter servos dont need higher speed torque smaller airplanes dont want unnecessarily overheat ESCs Im staying S8Os Thus ends monthly column Please enclose SASE correspondence youd like reply please continue enjoy high-flying quiet fun Electric brings l 1999 109
