A dynamic fin system (DFS) achieves fin rotation passively via water flow so
that
no direct active control of fin rotation is required by the watercraft operator.
The DFS, using a combination of fin rotation via at least one axle and resistive
forces applied to a fin mounting tab, provides an assembly in which a fin can pivot
from side to side in a reliable, effective and simple way. The DFS provides ease
in turning and stability at a neutral position while minimizing the amount of flow
resistance. The DFS provides a strong fin mounting, and uses a combination of an
axle for rotational control, a resistive centering force, and a force preload for
stabilizing the fin in the neutral position. The DFS provides a mount for a rotating
fin in a watercraft hull that supports repositioning of the rotating fin axis both
forward and rearward in the hull.