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US 5,809,926 AGranted
Lifting fin
OwnerKevin Kelseyinventor
Life of this patent
Estimating the term…
Abstract
A sloped hydrofoil (22) is mounted to the bottom of a sailboard or surfboard vertical strut (26) using a hinge joint (24). Hinge joint (24) allows reversal of sloped hydrofoil (22) slope in response to a hull (30) side slip. Efficient sloped hydrofoil (22) supports a portion of craft weight to reduce hull (30) drag.
Claims17
A hydrofoil assembly mounted on a hull comprising:
- (a) a substantially vertical hydrofoil;
- (b) a single sloped hydrofoil;
- (c) a hydrofoil hinging means for joining an upper end of said sloped hydrofoil to the bottom end of said vertical hydrofoil, said hinging means having a center line substantially parallel to the longitudinal axis of said hull;
- and
- (d) a hinging stop means for limiting said hydrofoil hinging means so that said sloped hydrofoil assumes a maximum angle of 90 degrees to both sides of the vertical.
2 more elements
A hydrofoil assembly mounted on a hull comprising:
- (a) a single sloped hydrofoil;
- (b) a hydrofoil hinging means for joining an upper end of said sloped hydrofoil to the hull, said hinging means having a center line substantially parallel to the longitudinal axis of said hull;
- and
- (c) a hinging stop means for limiting said hydrofoil hinging means so that said sloped hydrofoil assumes a maximum angle of 90 degrees to both sides of the vertical.
1 more element
A hydrofoil assembly mounted on a hull comprising:
- (a) a surfboard or sailboard fin;
- (b) a single sloped hydrofoil;
- (c) a hydrofoil hinging means for joining an upper end of said sloped hydrofoil to a bottom end of said fin, said hinging means having a center line substantially parallel to the longitudinal axis of said hull;
- and
- (d) a hinging stop means for limiting said hydrofoil hinging means so that said sloped hydrofoil assumes a maximum angle of 90 degrees to both sides of the vertical.
2 more elements
Dependencies are inferred from the claim text.