Swing sail boat
Patent 4799443 Issued on January 24, 1989. Estimated Expiration Date: 
December 19, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 19, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 1613890 1670936 3090340 3487800 3903827 Mast displacement mechanism Retractable sailboat mast High efficiency aerodynamic sail system for boats, and method for sailing Controllable wing sail Mast and keel movement for sailing vessels InventorApplicationNo. 06/942936 filed on 12/19/1986US Classes:114/39.29, With specific means acted upon by wind to provide sailpower114/102.21, And sheave or pulley114/39.32, Having specific mast mounting means114/91, SwingingD12/303Sailboat (3)ExaminersPrimary: Peters, Joseph F. Jr.Assistant: Salmon, Paul E. Attorney, Agent or FirmInternational ClassesB63H 9/06 (20060101)B63H 9/00 (20060101) AbstractA novel rigging for a sailboat is disclosed in which the mainsail is mounted between a luff boom and a foot boom, the luff boom being attached to the top of the mast by a fitting that allows rotation at least about a vertical axis parallel to the mast and about a tilt axis normal to the mast such that the luff boom can tilt out of the vertical. The fitting is joined to the luff boom at a pivot point above the center of effort of the sail, and not necessarily at its head. A tack sheet and a clew sheet restrict the tilt of the luff boom and its rotation around the mast. A jib sail, too, may be tiltably mounted by attaching it to a luff boom which is suspended at its head from a high point on the mast. The mast may be retractable or extendable and either luff boom may be given a streamlined cross section.Other References
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