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I know you can add a fan to the ESC but can you some how get one to vent the motor too or would that be effective at all?The lower the kv the higher the torque, and the cooler they will run dependant of course on the gearing. The higher the kv the faster, dependant on gearing and voltage, and WILL be a pain to keep cool.
2s is 7.4v. Lipo is 3.7v/cell and NiMh is 1.2v/cell.