Article: Porpoise problem.(Shop Talk)

I have a 2004 twin-console Polar Kraft Kodiak V178 with a Mercury 115 OptiMax that is turning a 13x19-inch SS prop and sitting on the transom. There is 1/4-inch between the bottom of the anticavitation plate and the bottom of the hull as checked with a straight edge. In other than dead calm water, the boat wants to porpoise as I throttle up. Trimming in helps to settle her down, but she starts again as I try to trim out. Any suggestions?

Ted Ziok

Via e-mail

I am assuming the ventilation plate is 1/4-inch below the bottom of ...

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