As you are running a submerged drive, the speed calculator is pretty much irrelevant as it is for surface drive setups. Tbones suggestions on parts are good, however I do not think you will need to run 8s to get you speed goals, 4s will probably be close, but you will have to test it out. I ran the same motor in a 45" mono on 10s with a prather 235 at 63 kph max. This was testing for endurance running and surface drive. It will be finding out the best prop and battery.
NZMPBA 2013, 2016 Open Electric Champion. NZMPBA 2016 P Offshore Champion.
2016 SUHA Q Sport Hydro Hi Points Champion.
BOPMPBC Open Mono, Open Electric Champion.
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