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US 4,741,282 AGranted
Sail
OwnerTerrence R. Dukeinventor
Life of this patent
Estimating the term…
Abstract
An aerofoil sail, with two sailcloth sides of substantially equal area and shape, and an airspace between them, and includes vents by which the airspace may be inflated by the wind, and structure by which either side of the sail may be made shorter from tack to clew than the other.
Claims7
A sail including:
- at least two opposed flexible sheets,
- at least one vent by which air may in normal use flow into a space between said flexible sheets, and,
- at least one outlet vent by which air may in normal use flow out of said space between said flexible sheets, said sail taking in normal use an aerofoil shape having two outer faces comprised of said at least two opposed flexible sheets with a first said face having a greater useful surface area than the second said face, wherein said opposed flexible sheets are connected by at least one flexible element joined to both, forming at least one baffle, said at least one baffle extending substantially vertically between said opposed flexible sheets, and having at least one vent therein through which air may flow in normal use.
Dependencies are inferred from the claim text.