Re: [electricboats] advice not on sailing boat

600 RPM at 11-inch pitch will come to around 8.5mk/h (allowing 15% slip).

Unsure if your motor will have enough torque though.  Seems like it will only be putting out ~2kW at that RPM.

If you have a previous reference for power consumption at various speeds for your boat, that would help.

Thinking you want closer to 8" pitch, then you can bring RPM up somewhat, which will get more total power out of the motor.

Yes, prop efficiency will suffer somewhat, but without more torque from the motor, something has to give.

The above is all assuming direct drive to the prop.  A 2:1 reduction helps with the total power issue,
allowing use of 24V instead of just 12V.  Obvious downsides of more complexity, noise, and drivetrain losses.

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