Moveable sponsons for hydrofoil watercraft, including both large

Details Moveable sponsons for hydrofoil watercraft, including both large Moveable sponsons for hydrofoil watercraft, including both large

1995-02-13

1996-08-13

Avila, Stephen

Ships

Ballasting

Floats

114274, B63B 4314

Patent

active

055446078

ABSTRACT:
Hydrofoil watercraft (HFWC)--particularly including extended-performance hydrofoil watercraft (E-P HFWC) characterized by a submerged demi-hull mounting hydrofoils, and also high-performance personal hydrofoil watercraft (P HFWC)--are rendered both tractable and pleasant to operate throughout broad operational ranges by the provision of selective upwards (i) flotation and (ii) planing forces from two sponsons moveable in position at the ends of hinged arms. At their maximally elevated, inboard, positions the sponsons are integrated with the contours of the main displacement hull--preferably a "V"-shape hull--so as to permit the HFWC to operate efficiently and handle well while not on plane, including while cutting through heavy seas. In their intermediary, or outboard, positions the sponsons serve to (i) stabilize the hull while the HFWC is stopped or moving slowly while (ii) providing planning surfaces that aid the HFWC to first come up smoothly onto a first plane, and then, at still higher speeds, smoothly onto a second plane on its primary hydrofoils. Once the HFWC is on its second, or hydrofoil, plane, the sponsons as well as the displacement hull are completely out of the water, reducing drag. In yet a third, maximally submersed, position the sponsons extend below and protect the hydrofoils and the propulsion, typically a propeller, so as to thereby permit safe operation of the HFWC in shallow water or during beaching.

REFERENCES:
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patent: 4669408 (1987-06-01), Schad
patent: 4875426 (1989-10-01), Soga et al.
patent: 4964357 (1990-10-01), Genfan

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