If you seem to start blowing the prop in turns the higher you raise the plate, usually a fourblade prop vs a three blade is a simple fix to the problem. I personally have not had this problem, but every set up is diffrient. It is common to lose a 1 to 3 mph with a four blade, but not on every application. some actually run faster. As stated before every setup is diffrient. The 20in shaft does perform diffriently than the 25, for instance ive run boats with the 25 that preffered to be jacked higher on the plate to obtain maximum WOT, where as my 20in shaft likes to be lifted a maximum of 1 to 1.5 on the plate to maintain maximum speed! Every thing has its pros and cons, but yes the 20 in. shaft works, and works well on bayboats set up properly.
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