Re: PLEASE HELP
Since you need about 500 RPM here is a rule of thumb - dropping 2" in pitch should get you 400 and make sure the engine is high enough, you may be dragging extra LU in the water, rasing it will 100 to 200.
I am not familiar with 4 blade props but maybe someone else does, that may be an option as well.
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Any way you measure it - dumbass is expensive
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