초록 ▼

A sail mounting frame extends upwardly from the hull of a boat and is constructed of a lower section and an upper section which rotate relative to each other about a first axis of rotation which extends generally vertically upwardly with respect to the hull of the boat. An overhung axle is rotatably

A sail mounting frame extends upwardly from the hull of a boat and is constructed of a lower section and an upper section which rotate relative to each other about a first axis of rotation which extends generally vertically upwardly with respect to the hull of the boat. An overhung axle is rotatably journaled to the mounting frame upper section for rotation about a second axis corresponding to the longitudinal axis of the axle. A circular convex sail is supported by a correspondingly shaped support frame, which support frame is mounted on the free end of the axle for rotation of the sail about both the first and second axis of rotation. The sail is constructed from a plurality of triangularly shaped, flexible sail segments which are selectively adjustable relative to the sail support frame between a closed position wherein all of the sail segments cooperate to form a substantially continuous circular convex form, and open positions wherein each of the sail segments are disposed at angles of attack relative to the wind to cause the sail segments to react to the winds to thereby rotate the sail about the second axis of rotation to power an auxiliary propulsion system for the boat.

대표청구항 ▼

In a wind driven dual propulsion system for a boat having a mounting frame extending upwardly from the hull of the boat and adapted to rotate about a first axis of rotation extending generally vertically from the boat, and a singular sail including a plurality of flexible sail segments disposed abou

In a wind driven dual propulsion system for a boat having a mounting frame extending upwardly from the hull of the boat and adapted to rotate about a first axis of rotation extending generally vertically from the boat, and a singular sail including a plurality of flexible sail segments disposed about a center, the improvement comprising: an overhung, elongate axle journaled at one end to said mounting frame for rotation about a second axis of rotation extending longitudinally along the length of said axle; and a sail support frame including a central hub member mounted on the free end of said axle and a plurality of arcuate sail supporting ribs disposed about the circumference of said hub, each of said ribs having a straight inner end portion extending radially, normally outwardly from said hub and an outer end portion curving transversely to said inner end portion and lying substantially in a plane which also includes the longitudinal axis of said axle, to thereby collectively define a circular-convex shape for cooperatively supporting said sail segments in an overall circular-convex sail shape thereby enabling said sail to function in the manner of a conventional sail to propel the boat and also enabling the sails to rotate about the longitudinal axis of said axle to serve as an auxiliary propulsion source.