Trim Tabs can easily correct a common problem among boaters called porpoising (figure A). Host John Greviskis explains what porpoising is and how trim tabs can solve the problem.
Porpoising is when the boat is up on plane and the nose of the boat lifts up and down much like a porpoise would. When this happens, it means that the bottom of the hull is running at the wrong angle when at a certain speed.
To correct this problem, trim tabs (figure B) can easily be installed. Trim tabs come in sets of two, and are metal plates that are attached to the bottom edge of the dead rise (figure C). The trim tab can be moved up or down with a push of a button installed on the dash. If the trim tabs are pushing water down, it will force the nose of the boat to plane out -- leveling up the boat. Trim tabs are also handy when you have more passengers on one side than the other, causing the boat to lean. To level the boat, lower the trim tab opposite of the side that is leaning.
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