Small watercraft with fin and jig

Abstract

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.

I claim:  
     
         1 . An elongated member of a small watercraft with fin and jig being covered by a water-foil means; said water-foil means being rotatable about a longitudinal centerline of a covered portion of the elongated member.  
     
     
         2 . A fin lock/release mechanism installed on an elongated member of a small watercraft with fin and jig consisting of a wire traveling and movable along the elongated member; a control handle being connected to an upper end of the wire; a pin-like means movable along the elongated member being vertically secured to a lower end of the wire.  
     
     
         3 . A jig/mast of a small watercraft consisting of an upper rod, a lower rod, a mast, and a membrane between the upper and lower rods; a leading end of the upper rod being loosely connected to a leading end of the lower rod; the upper rod being pivotally secured to an upper portion of the mast; a hook or a ring secured to the lower rod being used to loosely secured to the mast; a distance from leading ends of the upper and lower rods to the mast being slightly less than a distance from the leading ends to a center of wind force of the jig; the distance from the leading ends of the upper and lower rods to the mast being also slightly less than a distance from the leading ends to a center of gravity of the jig.  
     
     
         4 . A jig/mast according to  claim 3  in which a distance between the leading end of the lower rod to where the lower rod is loosely secured to the mast is about the same as a distance between the leading end of the upper rod to where the upper rod is secured to the mast.  
     
     
         5 . A jig/mast according to  claim 3  in which a string is installed in a middle portion of a trailing edge of the membrane.