Ships – Apparatus held by or attached to rider to control sailboard... – Foot strap means
Patent
1987-12-28
1991-06-11
Basinger, Sherman
Ships
Apparatus held by or attached to rider to control sailboard...
Foot strap means
114 61, B63B 114
Patent
active
050223380
ABSTRACT:
Four spars project downward and outward from a common juncture; a mast projects upward from the same juncture. Adjustable cables interconnect all the distal ends to each other. Thus a uniquely strong and light pentahedral-shaped space frame is provided. A unique system for cable length adjustment makes it practical to reconfigure the geometry of the vessel while underway. The vessel can be made tall and narrow for easier maneuvering, in light winds, or broad and low for maximum capsize resistance. Two hulls provide a suitable low speed displacement shape. When sufficient propulsion force is present, however, these two hulls can be split into four hulls, each of a planing shape and each connected to a spar. The wind drag, that is noramlly associated with frames of this nature, is transformed into useful forces by airfoil-shaped spars which are rotatable. These forces may be used to produce a downward push to prevent heeling over, a lift to reduce hydrodynamic drag, and a propulsive push.
REFERENCES:
patent: 2519230 (1950-08-01), Crankshaw
patent: 3104642 (1963-09-01), Piazza
patent: 3304898 (1967-02-01), Sainte-Claire
patent: 3831539 (1974-08-01), Black
patent: 4044702 (1977-08-01), Jamieson
patent: 4708075 (1987-11-01), des Snead
"Two Hulls and a Sail . . . That's Speed" Science Illustrated, Aug. 1946, pp. 68-69.
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