Catamaran

Details Catamaran Catamaran

1991-06-27

1993-04-06

Swinehart, Edwin L.

Ships

Displacement-type hull

Multiple hulls

B63B 100

Patent

active

051993678

ABSTRACT:
Two embodiments of hull designs for catamarans in which the sponsons are configured so as to provide a displacement type operation and in which the sponsons are configured so as to improve stability while reducing flow resistance. The sponsons are generally curved along their bottom surfaces and have a width that begins at a knife edge, increases gradually toward midships, then decreases with an increasing width section at the rear end thereof. In one embodiment, the sponsons are asymmetric so as to reduce the generation of waves deflected inwardly toward the main hull. In another embodiment they are symmetric. The main hull is also provided with a step at its rear end so as to avoid wave interference and the sponsons have steps at their rear ends so as to reduce front end lift when travelling at high speeds and reduce flow resistance.

REFERENCES:
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patent: 4907520 (1990-03-01), Pipkorn
"Beyond 2001", P.C. Hercus, High-Speed Surface Craft Mar.-Apr. 1988, pp. 25-30.
International Catamaran Designs Pty Ltd Specification Sheet for Quicksilver V, dated Nov., 1988.
International Catamarans Specification Sheet for 2001 30 Metre Wave Piercing Catamaran, dated Aug., 1987.

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