Ships – Sail or control means therefor – Having means to vary shape of sail
Reexamination Certificate
2005-03-08
2005-03-08
Avila, Steven (Department: 3617)
Ships
Sail or control means therefor
Having means to vary shape of sail
Reexamination Certificate
active
06863008
ABSTRACT:
A flexible wing-sail for wind-propelled vehicles includes a mast to be rotatably mounted in a vertical position on the vehicle, a plurality of flexible sail panels carried by the mast, and a spreader assembly secured to battens in the sail panels for securing them to the mast and for imparting to them an airfoil shape having a leading edge fore of the mast, and a trailing edge aft of the mast. The spreader assembly includes a fixed spreader unit secured to the sail panels at the bottom of the wing-sail and fixing it to the bottom of the mast, and a plurality of slidable spreader units secured to the sail panels at longitudinally spaced locations and slidable along the mast to permit hoisting and reefing the wing-sail. The wing-sail further includes a boom pivotally coupled to the bottom of the mast and having a sliding coupling with respect to the sail panels at the trailing edge of the wing-sail, and a brake for selectively locking the mast against rotation, such that pivoting the boom while the mast is locked, changes the curvature of the airfoil shape defined by the sail panels.
REFERENCES:
patent: 4624203 (1986-11-01), Ferguson
patent: 4685410 (1987-08-01), Fuller
Avila Steven
G. E. Ehrlich (1995) Ltd.
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