Dynamic fin system for watercraft

Details Dynamic fin system for watercraft Dynamic fin system for watercraft

2006-02-21

2006-02-21

Olson, Lars A. (Department: 3617)

Buoys, rafts, and aquatic devices

Water skimming or walking device

Having stabilizing surface

C114S152000

Reexamination Certificate

active

07001236

ABSTRACT:
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.

REFERENCES:
patent: 4733496 (1988-03-01), Wallner
patent: 4854904 (1989-08-01), Wahl
patent: 5070804 (1991-12-01), Strazzeri
patent: 5649846 (1997-07-01), Harper et al.
patent: 6053789 (2000-04-01), Miyashiro
patent: 6213044 (2001-04-01), Rodgers et al.
patent: 6439940 (2002-08-01), Pouchkarev

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