Check out tips and info on this forum under how to cool an electric motor, their are many different ways to do this, 1. through the hull. 2. attatching p/u on the transom. 3. or running copper tubing out the back of the transom and directing them behind the prop. I myself am going to try through the hull type, it looks clean and with less or no drag from what I can see in the tips and info section on this sight. good luck in you indever.
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