Some of us who race 45" monos run 8s on 800kv and 10s on 600 to 650kv. And were 65 to 70 mph on 67 to 70mm props. On a boat that size I would run 500kv on 12s so you can run a 75mm prop or bigger. I big boat like that will do better running a big prop slower than small props faster. I would also run the TP 5870 motor on this size of boat.
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