On my last twin wheel boat i ask why i could not put larger wheels on it as i had room. It was explained to me that being so close to the bottom would cause a disruption and cavitation due to the blade passing so close to the bottom. Reworked the original wheels. Then i could reach wot max rated RPM and at 75% was just past hull speed. Changed my fuel burn to the better and she was more responsive docking and was a noticed drop in engine vibiration at cruise speed. I had to change the thermostats as then i was not reaching full operating temp at cruise also. Read and talk to a real prop shop who has the ability to size the prop with boat deminisions and weight with true shaft H/P.
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