| 主权项 |
1. A swim fin comprising:
a blade, a retaining arrangement on the blade for removably securing a person's foot to the blade, and at least one propulsion increasing curved wall mounted to at least one surface of the blade, each propulsion increasing curved wall having a surface which increases a propulsion surface area of the swim fin for providing increased propulsion, said at least one propulsion increasing curved wall includes at least one propulsion increasing shell, wherein each shell includes:
a shell membrane extending outwardly from said at least one surface of the blade,a front wall formed inwardly of a forward edge of each shell to prevent entry of water into said shell membrane behind said front wall, anda cowl that extends outwardly from the front wall of the shell membrane,wherein an undersurface of the shell membrane in front of the front wall and an undersurface of the cowl function to provide an additional propulsion force during a swim stroke. |
