Marine vessels

Details Marine vessels Marine vessels

1998-03-18

2000-04-04

Sotelo, Jesus D.

Ships

Displacement-type hull

Multiple hulls

114283, B63B 300

Patent

active

060447842

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND TO THE PRESENT INVENTION AND SUMMARY THEREOF

This invention relates to marine vessels.
EP-A-0 495 722 discloses a marine vessel comprising a central hull stabilised by first and second pairs of outboard sponsons and propelled by propulsion means carried by the sponsons or the hull, the first pair of sponsons being disposed forwardly of the second pair of sponsons, the sponsons of the first pair being disposed at a higher level than the sponsons of the second pair, so that, at zero heel angle, at the load water line of the vessel, the sponsons of the second pair are in contact with the water while the sponsons of the first pair are disposed above the water.
The present invention relates to such a marine vessel, characterised however in that, at zero heel angle, the waterline breadth of each sponson of the second pair of sponsons is greater than the draft thereof, and that should the vessel heel to one side, the sponson of the second pair on the downgoing side of the vessel dips deeper into the water, while the other sponson of the second pair which is on the upgoing side of the vessel emerges from contact with the water, and the sponson of the first pair on the downgoing side of the vessel is simultaneously brought into contact with the water, so as to stabilise the vessel.
The hull may have a waterline length to beam ratio greater than 6 and preferably 10.
The vessel may be provided with first and second pairs of outboard sponsons, with the first pair disposed forwardly of the second pair, the sponsons of the first pair being disposed at a higher level than the sponsons of the second pair so that, at the load water line of the vessel, the sponsons of the second pair are in contact with the water while the sponsons of the first pair are disposed above the water whereby, should the vessel heel to one side, the sponson of the first pair on the heeling side of the vessel is brought into contact with the water, so as to create an upwardly acting restoring force which tends to stabilise the vessel.
The sponsons of each pair of first and second sponsons may be spaced from each other longitudinally of the vessel.
The sponsons of each pair of first and second sponsons may be combined so as to form a single integral structure of stepped form.


BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS

The various aspects of the invention will now be described by way of example only with reference to the accompanying drawings, wherein:
FIG. 1 is a side view of a first form of marine vessel,
FIG. 2 is a plan view thereof,
FIG. 3 is a bow-end view which illustrates a modification,
FIG. 4 is a side view of a second form of marine vessel.
FIGS. 5 and 6 are plan views thereof,
FIG. 7 is a side view of a third form of marine vessel,
FIG. 8 is a plan view thereof,
FIGS. 9 to 14 are front views which illustrate the behaviour of the sponsons of the vessel at various heel angles, and
FIGS. 15 and 16 are side views which illustrate modifications.
In the figures, like reference numerals refer to like structures and features.


DETAILED DESCRIPTIONS OF THE PREFERRED EMBODIMENTS

With reference to FIGS. 1 and 2, a marine vessel in the form of a freight ship 1 comprises a central hull 2 stabilised by a pair of outboard sponsons 3 flanking the stern end of the hull 2.
The hull 2 has a waterline length to beam ratio greater than 6. In this example, the ratio is 10. The waterline is shown at 8.
The sponsons 3 are pivotally attached to the stern end of the hull 2 by bridging structures 4 which are movable sternwards, relative to the hull, in a pantograph-like manner, so as to enable the hull to be manoeuvred close to a quay or like structure for hull loading/unloading operations.
The pivot points for the sponsons 3 are shown at 10 and 11, whereby the sponsons fold about substantially vertical axes.
The hull 2 carries a bridge accommodation superstructure 5 and has bulbous bow 6 and stern 7 structures.
The hull 2 defines four freight-carrying spaces in the form of cargo holds 9, with hatch covers 15, intended to accommodate cargo cont

REFERENCES:
patent: 2585599 (1952-02-01), Tchetchet
patent: 3085536 (1963-04-01), Teetor
patent: 3265026 (1966-08-01), Hamilton
patent: 3296992 (1967-01-01), Lanckenby
patent: 3847103 (1974-11-01), Takeuchi
patent: 3871317 (1975-03-01), Szpytman
patent: 5178085 (1993-01-01), Hsu
patent: 5235925 (1993-08-01), Farrier
patent: 5277142 (1994-01-01), Conor

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