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A system for powering a water vessel having as its principal components rectangular sails secured to a rectangular frame which in turn is attached to an annular mast rotatably mounted on a plurality of supports rigidly affixed to the vessel. In a second system the supports are rotatably mounted on t

A system for powering a water vessel having as its principal components rectangular sails secured to a rectangular frame which in turn is attached to an annular mast rotatably mounted on a plurality of supports rigidly affixed to the vessel. In a second system the supports are rotatably mounted on the vessel in a manner such that the supports and the annular mast may rotate independently of each other.

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A system for powering a water vessel, said system comprising: a plurality of spaced supports rigidly mounted to a support surface on the vessel and extending upwardly therefrom; an annular mast rotatably supported by the supports; a frame supported by the annular mast and secured thereto comprising

A system for powering a water vessel, said system comprising: a plurality of spaced supports rigidly mounted to a support surface on the vessel and extending upwardly therefrom; an annular mast rotatably supported by the supports; a frame supported by the annular mast and secured thereto comprising a lower boom extending across and fixed to said mast, generally perpendicular to an axis of rotation of said mast, and an upper boom spaced upwardly from and generally parallel to the lower boom; at least one sail extending between and secured to the booms; and a plurality of stabilizing braces on opposite sides of the upper and lower booms, the braces having a lower end secured to said annular mast and extending upwardly at an angle to said frame and secured to an upper portion of said frame adjacent the ends of said upper boom.