| 摘要 |
This invention is an improvement to a prior invention-Small Watercraft with Fin and Sail. The improvement consists of the introductions of a rotatable water-foil means, a fin lock/release mechanism, fin rotation stoppers, rear vertical fins, end floats, and a jig/mast. The rotatable water-foil means covers a portion of the elongated member and is rotatable about the centerline of the covered portion of the elongated member. The fin lock/release mechanism installed on the elongated member consists of a wire travelling and movable along the elongated member. A vertical pin-like means is secured at a lower end of the wire. The vertical pin-like means can only move toward or away from a lower end of the elongated member. The fin rotation stoppers consist of two members. Each of the members has one end connected to the elongated member and the other end connected to the leading edge of the fin. One or more vertical fixed fins are added to the rear portion of the watercraft. One suspended float is added at each end of the watercraft and between two existing floats to produce additional buoyancy and moment when pitch polling happens. The jig/mast consists of an upper rod, a lower rod, a membrane between the rods, a mast, and a string. The leading ends of the rods are connected. The middle portions of both of the rods are secured to the mast. The upper rod is secured at the upper portion of the mast while the lower rod can be moved up and down along the mast. A string is secured to a middle portion of the trailing edge of the membrane.
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