High efficiency ski for sailing on snow or ice
OwnerBernard Carroll Kenneyinventor
Life of this patent
Estimating the term…
Abstract
A ski is disclosed for efficiently sailing on snow or ice. The ski has greater thickness than a conventional downhill ski. The substantially triangular shape of the cross-section of the ski is longitudinally constant so as to generate simultaneously both lift and lateral forces with minimum drag. The surface of the ski in contact with the snow or ice is made from or treated with a low friction material. The ski has a longitudinally upward concave curvature to facilitate turning. The ski tip is formed with deadrise like the bow of a boat or, in the alternative, may be a thin shovel like the tip of a conventional ski. The ski incorporates an edge or blade extending downwardly below the central part of the ski to enhance the lateral to drag force ratio on ice.
Claims15
A sailing ski comprising:
- an upper surface and a lower surface and having greater thickness than a conventional downhill ski,
- said lower surface is made from or coated with a low friction material,
- the cross-section of said ski is substantially triangular and the shape of the cross-section is longitudinally constant,
- the bottom apex of said triangular cross-section has an included angle of 120 degrees +/−40 degrees, the precise value of said angle depending upon the design weight and sail area of the sailing craft and the relative magnitude of the lift and lateral forces required,
- said ski is not cambered longitudinally but is curved along its length in the opposite sense, upwardly concave,
- said ski has at least one longitudinal edge or blade extending downwardly near the longitudinal center of said ski,
- said ski has means for attaching to a platform, sailboard, iceboat or sailing craft.
A sailing ski comprising:
- an upper surface and a lower surface and having greater thickness than a conventional downhill ski,
- said lower surface is made from or coated with a low friction material,
- said lower surface is v-shaped in cross-section consisting of a port segment and a starboard segment with equal deadrise,
- said deadrise of said lower surface is longitudinally constant,
- said ski is not cambered longitudinally but is curved along its length in the opposite sense, upwardly concave,
- said ski has at least one longitudinal edge or blade extending downwardly near the longitudinal center of said ski,
- said ski has means for attaching to a platform, sailboard, iceboat or sailing craft.
A sailing ski comprising:
- an upper surface and a lower surface and having greater thickness than a conventional downhill ski,
- said lower surface is made from or coated with a low friction material,
- the shape of said cross-section of said ski is comprised of conjoined triangles and, except near the tip, the shape and the size of the cross-section are longitudinally constant,
- said ski is not cambered but is curved along its length in the opposite sense, upwardly concave,
- said ski has at least one longitudinal edge or blade extending downwardly near the longitudinal center of said ski,
- said ski has means for attaching to a platform, sailboard, iceboat or sailing craft.
Dependencies are inferred from the claim text.