Castle Holdings LLC -- our motor production facility

[Pdelcast]

Originally Posted by A RC Dude

If you took the time to write out all the many many equations to get to the bottom of the question, i bet you'll find that the the efficiency is not dependent on the size or turn count. I bet the difference in heat comes from nothing more then the size of the motor.

The 14xl has two things keeping it cooler:
1. The more surface area allows it to cool off better, especially over time.
This is why larger, more powerful ESC's require heat sinks with more surface area (typically larger or finer fins)
2. More mass requires more heat (energy loss) to get it up to the same temperature (especially in a short amount of time).
Looking into specific heat, the equation is:
heat added = specific heat x mass x change in temperature
In this case, the specific heat should be equal for both motors (same materials), canceling out. Same heat added and greater mass = lower temperature.

Edit: Sorry for awakening a dead thread, I just now saw the dates

Good thread to awaken tho! Good info in here.

BTW -- we are planning some limited edition (very high cost) motors for sale in the near future -- watch for 'em.