[SpEEdyBL]

What im saying is that it might be better to go with a smaller motor such as a Neu 1506 and use a higher kv than you would if you were to use a 1509. It generally takes more power to just to get a bigger motor running, and when you are not taking advantage of its physical capabilities, it will be less efficient and less powerful than a slightly smaller motor. By that, I don't mean running it until it's overreving, but 7.4v x 3600kv with a 1509 1Y is wasting a lot of potential power because its not spinning as fast as it could. Good brushless motors get more efficient as you increase voltage. A 1506 that has 5400 kv will have about the same power as a 1509 1y, and be more efficient, thus running cooler. Apparently, you are also worried about torque. Find a pinion gear that is 2/3 as big and torque will be the same as with the bigger motor.