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Old 12-18-2012
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overpropped vs underpropped

Back to the topic.
Having just replaced my three blade fixed with a four blade feathering. I find that I can only get to 2900rpm with the max WOT at 3200. But I can reach hull speed easily here.

Now I almost never run the engine at WOT. Probably 99% of the time at 2500 or less because I don't care for the motion of the boat over 8 knots. The engine is a Yanmar 4jh4HTE

Is the 4 blade adding more stress to the drive train than the three and am I doing damage at this prop setting?
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