Technical, Techniques, Hints, and Tips > BRUSHLESS Motors and Speed Controllers

Max Safe Amps/Volts ?

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John Mk2:
Hi All trying to find out if the B/L motor in my  H.O.R App/Cat will be safe on lipo 6s 35c ? Its a FSD F-540-36764 Xl  Useing a 125amp (150 burst) Suppo E.S.C ,38mm Prop

nick_75au:
According to a quick bit of research its a 2075 Kv motor which means at 6S it will want to spin at over 45000 RPM, you want to aim for 30-35000 rpm, any more and the props just cavitate so 4S would be my recommendation.

If  the Kv of the motor is different just divide 35000 by the Kv and that will give you the voltage to run at.

Nick

John Mk2:
Thanks Nick  :-)) Its got a 2770 kv sticker on it  {:-{ Thats the bit i cant work out {:-{

nick_75au:
Well 2770 is a 3S motor, don't think it will like 60,000+ Rpm %% you would want use around a 1500Kv for 6S ;)

Nick

Circlip:
Life was so much easier before "Inrunners" and "Outrunners" although the 380s and 400s etc. started to muddy the water. 2770kv seems to translate as 2770 revs per volt.

  Regards  Ian.

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