Quote:
Originally Posted by Descant
In my experience, porpoising is often caused by improper outboard/outdrive setting i.e. the drive is too far out from vertical. You may be able to stop spanking by bringing the engine in a little, then you can use the trim tabs for all the other things described in this thread.
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I might agree except that I can be traveling along for quite a while without a problem, i.e. the engine trim is fine, and then, without a change of speed, the porpoising starts. You can correct by changing the engine trim or you can use the trim tabs. Either one can force the bow down, which is the effect you want.