Semi-displacement hull
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United States of America Patent
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-
Dec 30, 2003
Grant Date -
N/A
app pub date -
Mar 4, 2002
filing date -
May 18, 2000
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A hull form which operates in the speed ranges where both planing and wave making affect hull resistance is presented with a configuration which reduces wave drag and improves performance in very fast and ultra-faste speed ranges. The specific distribution of immersed cross-sectional area minimizes bow wave making and optimizes the closing wake. Bow wave impedes forward motion of a hull form. Stern closing wake pushes the hull forward and enhances the forward motion. The bow sections are designed so that they have a 'hollow' entrance configuration which decreases the effort to spread the water and in turn diminishes the wave making as the hull pushes through the water. The stern sections are designed to be of such a configuration that as the water spread by the bow (34) now must close in around the stern (35) of the hull, the wave height is increased so that the closing wake exerts a forward thrust on the hull.
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