Fin drive mechanism for watercraft, has actuation crank that when operated enables thrust crank to move piston rod and to push fin fixed to actuation crank, where fin returns to starting point after full turn of actuation crank

摘要

The drive has an actuation crank (1) that when operated by foot enables a thrust crank (2) to move a piston rod (3) and to push a fin (4) that is fastened to the crank (1). The fin reaches its end position after a half turn of the crank (1) and returns to the starting point after a full turn of the crank (1). The crank (2) moves the rod outside a rod coupling point so that the fin is parallel to thrust direction.