My Electric Yacht 360ibl came with electric fans in addition to the internal shaft fans. It was run off the Gen4 controller. But if your are really worried about low speed heat build up why not just go water cooled?
it seems that the cooling mechanism for electric motors usually consists of a shaft mounted fan of some sort... in one way this is obvious but then again at low rpms there isn't much cooling going on and this is too bad as electric motors have the advantage of delivering high torque at low rpm.... seems like an externally powered fan system that move air at sufficient velocity regardless of the the motor rpm would be much preferable....interested in comments
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