Research was conducted during the 1997-98 academic year into the porpoising of "V-hulled" planing craft. The purpose of the study was to first correlate the porpoising inception results published by 1952 Webb Institute seniors Day & Haag at a much larger scale, then advance porpoising prediction methods to include higher deadrise hulls and the effects of trim tabs upon the inception of porpoising. The towing equipment and methods of testing the models in the U.S. Naval Academy's 380' High-Speed Towing Tank are the subjects of this paper.

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