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All I am saying is that it is a known fact that propellers that operate near the free surface see an interference effect from the flow separating off the stern. Studies have been done moving the propeller further aft and propeller efficiency is generally slightly improved. It is nothing dramatic but it is better. I don't recall the exact numbers but you might see another knot or so top end...something like that.
I would not do it for the so called "performance increase" you do it to keep your feet dry and general saftey
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