Wind surfboard, has two surface units for changing size of wetted sliding surface and its hydrodynamic bottom shape, where surface units are driven-out and tipped in sliding surface individually or commonly by foot button actuation

摘要

The wind surfboard (1) has two removable surface units (8) for changing the size of a wetted sliding surface and its hydrodynamic bottom shape. The surface units are driven-out and tipped in the sliding surface of the wind surfboard individually or commonly by a foot button actuation through a telescopic system during surfing. The size, geometrical shape, and structural depth of the surface units are designed flow-mechanically according to the riding characteristics for the wind surfboard.