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Originally Posted by suicideneil
Hv4.5 = 4800kv
HV4400 = 4400kv
Hv6.5 = 3100kv
I believe using the 6.5 would be an ideal solution to heat issues, since it has a lower kv rating & more torque than the others, so a greater input voltage could be used to generate the rpms, rather than a higher kv motor which draws more current = heat. I will have to wait until I get my new setup in a few months to compare the two systems, but each system has its own merrits.
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I dont think it works that way. Power is power. Rpm is one component of power and torque is the other. Unless you are reaching the mechanical limits of the motor, gearing is used to compensate one for the other and that's all that matters. The 4.5 is more powerful than the 6.5, meaning its more efficient at higher currents. Of course the 6.5 will run cooler, but that's just because its a slower motor. For instance, the 6.5 might run cooler when geared to go less than say 30-35 mph, but for any speeds greater than that, the 4.5 will run cooler. Also, I assure you that the hv4400 does not have 4400 kv. The ss5800 definately didn't have 5800 kv. In fact it was more like 4200 geared high. Honestly I don't know how novak came up with those original numbers. The numbers they supply now seem to be correct. They now list the ss5800's kv as 5000kv, which seems right for an unloaded value.