Quote:
Originally Posted by jeffk
In a similar vein, the trim tabs can also be used to reduce or eliminate porpoising. When the wave spacing and current running characteristics of the boat cause the bow to bounce up and down continually, using the trim tabs to force down the bow can be very effective. As noted, there is more drag from the tabs and probably pushing through the waves makes the engine work harder but I just push the RPMs up to compensate and enjoy the smoother ride.
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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.