Ships – Hull or hull adjunct employing fluid dynamic forces to... – Having hydrofoil
Patent
1993-07-27
1995-04-11
Oberleitner, Robert J.
Ships
Hull or hull adjunct employing fluid dynamic forces to...
Having hydrofoil
114280, 114284, B63B 130
Patent
active
054048303
ABSTRACT:
The invention is a displacement boat hull having the outboard surfaces of its wetted portion designed with a deep-V shape, and having at least one pair of retractable hydrofoil fins positioned in respective pockets along those outboard surfaces at a predetermined distance above the keel. When extended, the fins are positioned at fixed angles relative to the hull, and at least one pair of fins is positioned in proximity to the stern. In a preferred embodiment, a conventional deep-V semi-displacement hull is modified to increase the conventional maximum draft with an unusually steep angle (at least 30.degree.-40.degree.) for the initial deadrise from the keel upward toward the chine; and at least two pairs of fins are disposed on opposite sides of the hull, with an aft pair being positioned in proximity to the stern and another pair being positioned forward of the stern pair, preferably just forward of the boat's center of balance. The fins are continuously adjustable from (a) a fully-retracted in-pocket position to (b) a fully-extended position laterally outboard of the hull. The invention can be used to modify catamaran and tri-hulls as well as mono-hulls, and it is compatible with all types of propulsion systems. Such modifications provide a remarkably low center of gravity that assures excellent balance and stability at all times, particularly when operating with the fins, while achieving higher speeds and requiring less power.
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Bartz Clifford T.
Oberleitner Robert J.
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