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a freind of mine has a nice 10' hard bottomed inflateable. the boat has a 25hp motor with a wedge. the motor is mounted as low as it will go, could raise it like 2". he has put this whale tail lookin thin on the lower unit and it has a tiny ass 3 blade prop. also has trim tabs that are like 8" long. right now it will run like 25 and planes out well. I am thinking jack the motor up and play with the props. what kind of top end increase might be available?
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One of the local outboard gurus told me to try raising (jacking up) the motor when we were having a Dinghy race one time. I have a 10' hardbottom with a merc 15. The whale tail made a huge difference on mine. I think adjustable trim would help too. Seems to me that the biggest gains are found by removing or re-positioning weight.(My fat ass) :)