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I doubt that anyone here can make 3500 RPM in forward with a direct drive.
I have the Indigo prop and do 6 knots at 1800 to 2000 with a maximum of 2300-2400.
We are all over propped as far as the engine is concerned. That is just a problem with a direct drive and possibly no swing room.
A 20 to 30 HP diesel? I dont get it. That is less power then the atomic four. The diesel would have a reduction gear and be able to access that HP.
This subject is always fun and has been talked about many times.
fair winds
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