Lift creating sail and sail system

Details Lift creating sail and sail system Lift creating sail and sail system

1997-12-02

1999-07-06

Swinehart, Ed L.

Ships

Sail or control means therefor

Including means to orient sail

11410218, B63H 904

Patent

active

059185619

ABSTRACT:
An improved lift creating sail and sail system where a substantially rectangular mainsail made up of a plurality of panels forms an aerodynamically efficient airfoil that is supported at approximately its center on a pivot so that it has three degrees of freedom. The mainsail can be tilted athartships, rotated along a yaw axis, and tilted fore and aft to create lift and minimum drag. An optional jib sail that tracks the motion of the mainsail also produces lift. The mainsail and jib sail can be trimmed and positioned along three degrees of freedom to obtain maximum lift and minimum drag as well as a stable system. The effect of this sail system is to increase the speed of the boat by 15-25%.

REFERENCES:
patent: 587046 (1897-07-01), Smith
patent: 758171 (1904-04-01), Collins
patent: 4005669 (1977-02-01), Klemm
patent: 4584957 (1986-04-01), Belvedere
patent: 4653417 (1987-03-01), White
patent: 4671201 (1987-06-01), Yokoyama
patent: 4917036 (1990-04-01), Berg
patent: 5509368 (1996-04-01), Wald

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