Sailing system

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.