Ships – Displacement-type hull – Multiple hulls
Patent
1992-10-13
1994-06-07
Mitchell, David M.
Ships
Displacement-type hull
Multiple hulls
114345, 114357, B63B 708
Patent
active
053179838
ABSTRACT:
The invention relates to a shallow-draft watercraft having the ability to withstand impact stresses caused by upwardly travelling water movement corresponding to a shock factor (CF) of up to about 1.5. The watercraft comprises at least one superstructure, which is intended to be located above the surface of the water, at least two pontoons which float on the water, and devices for supporting the superstructure. The watercraft is characterized in that the pontoons are gas-tight and gas-filled and of a substantially cylindrical and elongated configuration. The pontoon walls include several layers of material, of which at least one layer inwardly of the outermost layer is a reinforcing layer. The reinforcing layer includes threads which are wound in at least three directions, wherein the material layers are disposed so that the pontoons are rigid with regard to bending, transversely acting forces and axial rotation, provided that an overpressure prevails within the gas-filled pontoons. The superstructure supporting devices rest on the pontoons, essentially transversely to the longitudinal axis of the pontoons.
REFERENCES:
patent: 824506 (1859-12-01), Morton
patent: 2743510 (1956-05-01), Mauney et al.
patent: 3001213 (1957-04-01), Stark et al.
patent: 3473502 (1968-06-01), Wittkamp
patent: 4462331 (1984-07-01), McCrory
patent: 4660497 (1987-04-01), Cochran
patent: 4928619 (1990-05-01), Cochran
Soderqvist Rolf
Strifors Hans C.
Avila Stephen P.
Mitchell David M.
Trelleborg Industri AB
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