Fin for sailing board, with sawtooth form projections on leading edge

摘要

The fin (1) for a sailing board (2) has sawtooth-form projections (4) on its leading edge (3). There may be several of these projections, and the leading edge may be sharp. The sawtooth projections cause extra vortices (5) on the leading edge, departing from the suction side of the fin and creating additional transverse forces.