[Dr_T]

Yeah, I hope you can have some more fun with it. It seems the cheaper motors (Turnigy, Leo, Toro) with low kv have quite low Current ratings, mainly depending on higher Voltage to produce enough Power. The TP motors are specced a bit higher Current-wise for same kv/size combos. I thought I could keep the Turnigy happy with some cooling, but the 106 A rating seems quite realistic. If you want to try a higher Voltage on yours to see if you can keep the Current low enough, you can have my rotor as a spare whenever the post stops striking.

I asked Vedder already if he can say anything about generalizing that 60k electrical RPM as optimum trade-off point between copper losses (I^2*R: high at high load - low RPM) and non-copper losses (Eddy Currents, hysteresis and whatnot: high at low load - high RPM), as he explicitly mentions on his site that it comes from his experience with 14-pole, 50-60 mm dia outrunners. Curious if he can elaborate a bit more on the principles, but the thing for our RCs is that we typically go through the whole RPM range constantly anyway, so there's a constant change in the dominance of the copper vs. non-copper losses, depending on in what phase of the run you are... although that's my noob thoughts on it :).

I'll have to give the motors some thought still, but I am realizing Current rating is not as unimportant and can't be boosted as easily with aircooling as I thought.

Thanks for the info!