Ships – Watercraft with means used in providing sailpower – Having specifically defined hull shape
Patent
1978-12-07
1980-09-30
Basinger, Sherman D.
Ships
Watercraft with means used in providing sailpower
Having specifically defined hull shape
114 61, 114291, B63B 120
Patent
active
042248892
ABSTRACT:
A sailing-multihull hull shape is disclosed which is designed to produce hydrodynamic lift in addition to static buoyant displacement lift. The dynamic lift is generated in direct proportion to the horizontal surface area times the square of the velocity of this surface through the water. High-lift, relatively low drag horizontal surface area is provided by a series of horizontal steps on V-shaped amas (sponsons or pontoons) and preferably on the center hull, if any. The width of the steps preferably increases from the keel up, so that the widest is nearest the deck. To reduce drag through wake induced turbulence, it is also preferred to rotate back into the basic V-hull shape so that at the stern there are no visible steps. The enhanced lift produced by the steps can significantly increase the stability and righting moment of the sailing-multihull, and allow a greater load carrying ability with less reduction of speed.
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Multihull Seamanship, Michael McMullen, National _Publishing Company, Ltd., Lymington, Hampshire, England, 1976, pp. 60-61.
Basinger Sherman D.
Separate Reality, Inc.
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