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when running up on plane with my 21ft seapro w/a with 200yam seaox 66 motor trimmed all the way down and trim tabs in the up position if i trim the motor up at all the the bow will porpose.i do gain speed and rpm when trimming up but its to rough of a ride. is there something to cure this other than not trimming the motor? thanks for any help.
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There's always many factors that result in porpoising hulls. Load balance, type of prop, motor height are a few. Are you using a 3-blade or a 4-blade prop? When you're running on plane is the motor's cavitation plate above the waterline? If not, raise it a hole at a time till it is. Try tapping the trim tabs down a little at a time to stabilize the boat, but only as much as necessary (drag). If you have a 4-blade prop available try that, they usually offer better grip and control of the boat's behavior.
Mike
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