| 摘要 |
<p>A fin (1), used on water craft (25) such as surfboards, giving an adjustable angle (A) to the transverse axis of the water craft (25). The fin (1) is frictionally or mechanically locked in a selected one of a number of possible angular positions. One form includes a box (22), placed in the water craft (25), having a circular sectioned groove (9) which closely houses a cylindrical intermediate section (21), the fin closely sits in a slot within the section (21) and the assembly is clamped tight by screws (19) which force the root (2) of the fin (1) against the bottom of the groove (9).</p> |
