| 摘要 |
The invention relates to a fin unit ( 2 ) with elastic attachment system on an underside ( 1 ) of a marine apparatus, such as a wind surf, kite surf, fly surf, wakeboard, knee board and particularly a surfboard. The fin in the mounting thereof is partially made to self-align in the flow of liquid medium with the aim of avoiding the hydrodynamic stall caused by the passage of high turbulence and/or large lateral movements caused by the surfer in extreme motion. The possibility for self-orientation is due to three fundamental parameters which are: the type of elasticity of the attachment system ( 3 - 4 - 5 - 27 ), the forward position of the centre of gravity G towards the leading edge ( 15 ) and the form of the root profile ( 9 ) of the fin ( 2 ) which has a thickening ( 7 ) of the trailing edge thereof.
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