Integral foils for surf craft fins

Abstract

An integral foil for a surf craft fin comprising: a base portion extending in generally planar fashion between a base edge and a transitional edge spaced from the base edge; a foil portion extending in a generally planar fashion at an angle to the base portion from the transitional edge of the base portion to an intermediate edge spaced from the transitional edge; a tip portion extending in a generally planar fashion substantially parallel to the base portion from the intermediate edge of the foil portion; fastening means for fastening the surf craft fin to a surf craft having a floating plane; and wherein the base portion, foil portion and tip portion are of an integral and coextensive form.

1 . An integral foil for a surf craft fin comprising:
 a base portion extending in generally planar fashion between a base edge and a transitional edge spaced from the base edge;   a foil portion extending in a generally planar fashion at an angle to the base portion   from the transitional edge of the base portion to an intermediate edge spaced from the transitional edge;   a tip portion extending in a generally planar fashion substantially parallel to the base portion from the intermediate edge of the foil portion;   fastening means for fastening the surf craft fin to a surf craft having a floating plane; and   wherein the base portion, foil portion and tip portion are of an integral and coextensive form.   
     
     
         2 . The integral foil according to  claim 1 , wherein the foil portion is substantially at right angles to the base and tip portions. 
     
     
         3 . The integral foil according to  claim 2 , wherein the transitional edge of the base portion is substantially parallel to the base edge. 
     
     
         4 . The integral foil according to  claim 3 , wherein the foil portion is substantially parallel to the floating plane of the surf craft. 
     
     
         5 . The integral foil according to  claim 3 , wherein the foil portion is provided at an obtuse angle to the base and tip portions, the base, transitional and intermediate edges being non-parallel. 
     
     
         6 . The integral foil according to  claim 1  wherein the angle between the foil portion and the base and tip portions is in the range of from 90° to 110°. 
     
     
         7 . The integral foil according to  claim 1 , wherein the angle subtended by the intersection of the base and transitional edges is between 0° and 20°. 
     
     
         8 . The integral foil according to  claim 1 , wherein the angle subtended between the transitional and intermediate edges of the foil portion is between 0° and 5°. 
     
     
         9 . The integral foil according to  claim 1 , wherein the fin is formed from flexible material having resilience which permits flexing of the portions thereof with respect to one another of up to 20° in the angle between the foil portion and the other portions.