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Model Forum / Radio Controlled / Air Models / July 2008Can I run a 7.2 volt motor from a 9.6 volt battery if I keep the throttle low?
http://www.gwsus.com/english/product/MOTOR/MOTOR.HTM Can I run a 7.2 volt motor from a 9.6 volt battery if I keep the throttle low? I am guessing that If I keep the throttle below 65% there should be no problems, is this guess correct? > http://www.gwsus.com/english/product/MOTOR/MOTOR.HTM > > Can I run a 7.2 volt motor from a 9.6 volt battery if I keep > the throttle low? > I am guessing that If I keep the throttle below 65% there > should be no problems, is this guess correct? Yes and no, you can do it but not for long as the power will eventually burn up the motor. Don't ask how I know as you can probably guess. +++ STARCAD PLANS +++ Your site on the Internet for FREE Model Airplane Plans Bookmark this site for the fantastic resource it is. <http://www.starcadplans.net> > http://www.gwsus.com/english/product/MOTOR/MOTOR.HTM > > Can I run a 7.2 volt motor from a 9.6 volt battery if I keep > the throttle low? > I am guessing that If I keep the throttle below 65% there > should be no problems, is this guess correct? depends on what is meant bya 7.2v motor, I've been running 6v speed 400's on 11v for years no problem. the secret is to use a smaller propellor or a bugger gearbox ;-) >> http://www.gwsus.com/english/product/MOTOR/MOTOR.HTM >> [quoted text clipped - 7 lines] > problem. the secret is to use a smaller propellor or a > bugger gearbox ;-) What I mean is the GWS motor on the link above. This motor will be used with a GWS slow stick and a gear box. The gear box that comes with the slow stick is 3:1. The motor is brushed. >>> http://www.gwsus.com/english/product/MOTOR/MOTOR.HTM >>> [quoted text clipped - 12 lines] > box that comes with the slow stick is 3:1. The motor is > brushed. If its a 380/400 motor, its fine on 9.6v ..probabaly use it on an 8x6 or 9x7 prop. If its the 300 series motor, its a shade into brush bounce territory, and although it will work the brushes tend to burn. The ratings on tehse motors apply to ultra long life and the ability to be stalled briefly in e.g. car window winders and toothbrushes..we can get a bit more out of them than that! Ther is no real upper limit on a motor voltage wise..variously one of three things happens toa brushed motr with a high voltage on it..it acrs over the insulation - probably at several jundred volts! - it overspeedds and teh aramature flies apart! - its goes so fast that the brushes bounce around, arc like crazy and burn out. This is the normal failure mode of a mabuchi can like the GWS motors. From experienec the speed 350 series really do not like much more than 9.6v..that is the absolute limit, but the IPS (150 sie) and 400 size are perfectly happy on 11v or more. As long as teh current is within sane limits..typically 9A maxiumum. >>>> http://www.gwsus.com/english/product/MOTOR/MOTOR.HTM >>>> [quoted text clipped - 42 lines] > As long as teh current is within sane limits..typically 9A > maxiumum. That is great. I was looking at 9.6 volt on a 400 sized motor. So are you saying that this motor can handle 9.6 volts at full throttle as long as I don't exceed a 9 amp draw? (Actually the fully charged NiMH batteries will initially have 11.2 volts). > That is great. I was looking at 9.6 volt on a 400 sized > motor. So are you saying that this motor can handle 9.6 > volts at full throttle as long as I don't exceed a 9 amp > draw? (Actually the fully charged NiMH batteries will > initially have 11.2 volts). Yes. On a 3:1 box an 8x6 is certainly safe. >> That is great. I was looking at 9.6 volt on a 400 sized >> motor. So are you saying that this motor can handle 9.6 [quoted text clipped - 5 lines] > > On a 3:1 box an 8x6 is certainly safe. OK so (3:1 box) means 3:1 gear ratio, I don't know what 8x6 means. >>> That is great. I was looking at 9.6 volt on a 400 sized >>> motor. So are you saying that this motor can handle 9.6 [quoted text clipped - 7 lines] > OK so (3:1 box) means 3:1 gear ratio, I don't know what 8x6 > means. 8" diameter 6 inch pitch. EG GWS 8060 >> That is great. I was looking at 9.6 volt on a 400 sized >> motor. So are you saying that this motor can handle 9.6 [quoted text clipped - 5 lines] > > On a 3:1 box an 8x6 is certainly safe. OK so (3:1 box) means 3:1 gear ratio, I don't know what 8x6 means. >> That is great. I was looking at 9.6 volt on a 400 sized >> motor. So are you saying that this motor can handle 9.6 [quoted text clipped - 5 lines] > > On a 3:1 box an 8x6 is certainly safe. OK so (3:1 box) means 3:1 gear ratio, I don't know what 8x6 means. >>> That is great. I was looking at 9.6 volt on a 400 sized >>> motor. So are you saying that this motor can handle 9.6 [quoted text clipped - 8 lines] >OK so (3:1 box) means 3:1 gear ratio, I don't know what 8x6 >means. 8x6 means prop length (8) x prop pitch (6)... >> That is great. I was looking at 9.6 volt on a 400 sized >> motor. So are you saying that this motor can handle 9.6 [quoted text clipped - 5 lines] > > On a 3:1 box an 8x6 is certainly safe. OK so (3:1 box) means 3:1 gear ratio, I don't know what 8x6 means. >> That is great. I was looking at 9.6 volt on a 400 sized >> motor. So are you saying that this motor can handle 9.6 [quoted text clipped - 5 lines] > > On a 3:1 box an 8x6 is certainly safe. OK so (3:1 box) means 3:1 gear ratio, I don't know what 8x6 means. > > That is great. I was looking at 9.6 volt on a 400 sized > > motor. So are you saying that this motor can handle 9.6 [quoted text clipped - 5 lines] > > On a 3:1 box an 8x6 is certainly safe. I am probably running on a 3:1 with a 10x6, that is what comes stock with my GWS Slow Stick. Will this still be OK? >>> That is great. I was looking at 9.6 volt on a 400 sized >>> motor. So are you saying that this motor can handle 9.6 [quoted text clipped - 7 lines] > I am probably running on a 3:1 with a 10x6, that is what comes stock > with my GWS Slow Stick. Will this still be OK? No. it wont be safe. You may get away with it for a while, throttled back. >> That is great. I was looking at 9.6 volt on a 400 sized >> motor. So are you saying that this motor can handle 9.6 [quoted text clipped - 5 lines] > > On a 3:1 box an 8x6 is certainly safe. What about the maximum voltage of three LiPolys? >>> That is great. I was looking at 9.6 volt on a 400 sized >>> motor. So are you saying that this motor can handle 9.6 [quoted text clipped - 6 lines] > > What about the maximum voltage of three LiPolys? yes: I run a couple of speed 400s on 3:1 and 8x6s on 3s 1100 packs. Pull a shade under 10A on a very freshly charged pack, and will get quite warm at full throttle, but usually once I am in the air its down to half throttle to putter around. However DO be careful of BEC issues..Ive had problems with a 4 servo setup and a rather small and not very well cooled 12A ESC in a plane equipped with this exact combo. The whole avionics shut down and crashed the plane (not too badly) after 6 minutes up in the air. I now have a bigger 25A ESC in there and some cooling holes in the cowl and out through the cockpit floor, and no more troubles to date. |
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