Quote:
Originally Posted by sleebus.jones
You're getting all the right answers for all the wrong reasons. :)
The higher voltage is the reason for the lower amp draw, not the KV of the motor. If you're doing the same work, you're doing the same work. If the efficiencies of the motors are the same, then the heat level is going to be the same. If we assume all of those motors are equally efficient at 90%, then they'll radiate 177.6w of heat, regardless of current draw.
The only way to make the same power with less heat is to get a more efficient motor.
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Do you have first hand experience? I do with all the set ups I mentioned. Guess which one runs cooler and longer. Try it out and then tell us how a 8-10S with the appropriate Kv motor compares with a 4S set up and again with the appropriate Kv motor. What you saying will work on paper, but in real world I've found out that it doesn't work out. The numbers I posted was for AMP spikes and the avg. I get from my 8S set up is only 5A while I've seen over 10A with 6S. I haven't had much data on 4S, but with a similar set up as the 8S I've found that my ESC, battery and motor were all much warmer. I've heard of guys avg. over 20A on a 4S set up and that's where you see losses due to heat. You can have all the watts, but electric motors also makes power from torque and that's where a lower Kv motor (Brushed or Brushless) will have the advantage.