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« on: October 02, 2012, 10:00:39 PM »
parthu_777
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City: Ahmedabad
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hey guys,

what means watt ratings in rc electric motors?
i have turnigy 42-38 750kv motor..runs well..but in specification it says 785w...
i dont know what does it mean?
is it good to have small amount of watt?

i am running this motor on hobbyking epp-fpv..14"x6" prop..2700grms weight..

please answere in detail..

thanks

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« Reply #1 on: October 02, 2012, 10:11:08 PM »
hyd_quads
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It's synonymous to the watt rating of an electric lamp. For the sake of simplicity consider a bulb rated at 50W. And you normally apply 220V across it. Since power=Voltage*Current, the amps consumed will be 50/220 = 0.22A
Here, the Watt rating of the motor defines the Max. Watts. So if a motor is rated 500W and you're using it on a 3s LiPo (11.1V), choose your prop such that the motor doesn't draw >45A (500/11.1) to keep it safe.
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« Reply #2 on: October 02, 2012, 10:40:58 PM »
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RC India - Flying and racing with open minds !
Apparently you did not read the Gems threads.

http://www.rcindia.org/electric-power/understanding-electric-power-systems/

http://www.rcindia.org/electric-power/amp-rating-and-motor-size/
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