I would suggest something like THIS MOTOR and cooling jacket in 1300kv form, on a 5000mAh+ 4S LiPo LIKE THIS, This combination will give you a bit more performance that your IC engine on the same prop, and is oversized so will run cool and last forever as long as you keep it dry and the bearings oiled. I would suggest that you use it with a 100+ Amp watercooled ESC (again over specced for cool running and long life), but I will assume that with a scale boat and a solid shaft that you want forward and reverse, I know boat ESCs with forward and reverse exist, but I generally use converted airplane ESCs which are forward only for race type boats, so dont have the experience to suggest a suitable ESC.
Paul Upton-Taylor, Greased Weasel Racing.
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