Ships – Mother ship – floating landing platform – and harbor – Vessel carrier
Patent
1996-11-21
1998-03-03
Basinger, Sherman
Ships
Mother ship, floating landing platform, and harbor
Vessel carrier
114 67A, B63B 3542
Patent
active
057223416
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to the hulls of seagoing vessels and more particularly, but not exclusively, to hulls of very large dimensions. Vessels or ships, equipped with such hulls are referred to generally as "Jumbo Barge Carriers" (JBC).
The hulls of cargo-carrying vessels adapted for displacement speeds, for instance to eliminate planing, will have a length of from 400 to 450 m and a width of from 70 to 80 m.
The invention relates even more particularly to a hull construction which is designed for forward displacement speeds and which includes a barge-carrying cargo deck located adjacent a waterline and a control space, etc., which is located in the foredeck as seen in the normal movement direction of the vessel, wherein the cargo deck has extending along the port and starboard sides thereof side members or wall members and/or a centrally located central member or wall member and is open towards the stern of the vessel, wherein the hull interior encloses one or more ballast tanks, and the means required to empty or fill the ballast tanks either completely or partially, with water, thereby to ensure that a relevant hull waterline can be chosen for shallow draft conditions by emptying the ballast tanks with the aid of said means, or for deeper draft conditions, by filling the ballast tanks with the aid of said means, wherein when the ballast tanks are full the cargo deck will be located so far beneath a waterline that fully loaded barges are able to float across the cargo deck, whereas when the ballast tanks are empty the cargo deck will be located at a height at which the weight of the barges will be taken-up either totally or partially by the cargo deck, and wherein there is provided an air compressing device which is adapted to generate an air flow that can be delivered through a pipe system to the outer surface of the hull and which discharges beneath the waterline.
In order to enable the invention to be applied in practice, there is required a special, although previously known, hull design which in cross-section, at least beneath the waterline, has a flat bottom-associated surface and side members which are upstanding from the port and starboard edges of said surface and which diverge away from said bottom-associated flat surface.
DESCRIPTION OF THE PRIOR ART
Cargo vessels equipped with hull designs of the aforesaid kind are known to the art.
As an example of the earlier state of the art, from which the present invention can be said to depart, reference is made to the hull design shown and described in Swedish Patent Specification 426 465 (Patent Application 80 03444-0).
With regard to the singularities associated with the present invention, it can be mentioned that it is known from Swedish Patent Specification 353 500 in the case of ice-breakers to eject air through tubular openings in the hull and to use, to this end, nozzles that are mounted beneath the waterline at a distance corresponding to 30 to 50% of the ship's draft, so that with the aid of large volumes of air the surface of the water can be raised to a significant height in the form of a ridge adjacent the hull waterline, so that water will flow away from the ship's sides and therewith move ice-floes and the like away therefrom.
Swedish Patent Specification 447 891 teaches a method of reducing the frictional resistance of an object moving in a fluid, by blowing a stream of gas along that side of the object which is in contact with the fluid. According to this specification, the fluid-contacting side is coated with or comprised of a gas permeable material which generates a low pressure drop in the gas as it passes through the material. It is stated that microbubbles can be formed adjacent said fluid contacting side so as to improve the technical effect, by applying pressure surges.
It is earlier known from Swedish Patent Specification 436 186 to design a ship's hull in which the bottom of the hull is provided with a plurality of downwardly open channels which are intended to receive air as the ship moves forwards a
REFERENCES:
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patent: 1107741 (1914-08-01), Ballin et al.
patent: 1803104 (1931-04-01), Fletcher
patent: 2138831 (1938-12-01), Brammer
patent: 2218938 (1940-10-01), Rinne
patent: 2988035 (1961-06-01), Gram
patent: 3595191 (1971-07-01), Grundy
patent: 3823681 (1974-07-01), Cushing et al.
patent: 3934530 (1976-01-01), Kossa et al.
patent: 5146863 (1992-09-01), Ford
Patent Abstract of Japan, JP 58-47690 (A), vol. 7, No. 128, M-220, "Method of Reducing Frictional Resistance of Ship and Its Device", Kazu Tanabe, 19 Mar. 1983.
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