US3426717A - Shallow draught vessel - Google Patents

Description

Feb 1969 A. A. OSKOLSKY ETAL 3,426,717v

SHALLOW-DRAUGHT VESSEL Sheet Filed Feb. 28, 1967 Filed Feb. 28, 1967 Feb. 11, 1969 AI.A.OSK OLSKY ETAL 1 SHALLOW-DRAUGHT VESSEL Sheetv 2 of 2 United States Patent 2 Claims ABSTRACT OF THE DISCLOSURE A small-draught vessel having a bottom which is concave in the bow section and flat or substantially flat in the stern section. The bottom is keel-shaped amidships and turns smoothly into concave lines in the bow section and flat lines in the stern section.

This invention relates to vessels intended for operation in shallow-water basins, where it is necessary to come up directly to the shore.

More particularly, the invention relates to vessels with a combination sledge-shaped flat-bottomed hull.

There are known shallow-draught vessels whose bottoms are made concave in the bow section (such as the Hickman sea sledge), while the stern section of their bottom is made hat, or has a somewhat similar form.

However, the use of these vessels in shallow water is hampered owing to air draw-through under the bottom towards the propeller. This renders the stable running of the water-jet propeller impossible, or calls for the installation of the propelling screw deep below the water surface, which is impracticable for sailing in shallow-water basins.

An object of this invention is to eliminate the abovementioned disadvantages.

A primary object of the invention is the development of a shallow-draught vessel having such lines of the hull which would provide for good hydrodynamic characteristics of the vessel as a whole, for stable functioning of the propeller at the minimum draught, and the possibility of coming up directly to a non-equipped sloping shore.

The object specified above has been achieved, in accordance with this invention, by the development of a vessel whose bottom is made carinate amidships, smoothly turning to concave in the bow section and to fiat in the stern section.

It is expedient that the bottom of the vessel invented by us would be made with a general smooth rise towards the bow, as high as the waterline, said rise extending through a length of not less than one-third of the vessels overall length, with the purpose of enabling the vessel to directly contact a sloping shore.

In order that the invention may be readily carried out into effect, an embodiment will now be described by way of an example with reference to the accompanying diagrammatic drawings in which:

FIGURE 1 is a side view illustrating a vessel in accordance with the invention.

FIGURE 2 is a plan view of the vessel shown in FIGURE 1.

FIGURE 3 is a section taken on lines I-I of FIG. 1.

FIGURE 4 is a section taken on lines II-II of FIG. 1.

FIGURE 5 is a section taken on lines III-I-II of FIG. 1.

FIGURE 6 is a section taken on lines IV--IV of FIG. 1.

FIGURE 7 is a sheer line drawing of the vessels hull, in accordance with the invention.

In the bow section the hull of the vessel (FIG. 1) has low-positioned bows 1 forming two bow stems, with a sledge-type vault 2 (FIG. 3) located between said stems.

From the bow section, a gradual transition towards the keel-shaped lines 3 of the bottom begins, as shown in FIG. 4.

In the zone of intersection with waterline 4, the lines of the bottom form two vaults 5.

The gradual sinking of the keel line below the line of the bows (FIG. 5) for-ms flat-keeled lines 6 of the vessels bottom.

Further towards the stern (FIG. 6) the vessels lines turn into fiat ones 7, or almost flat lines. The shape of the vessels bottom will be more clearly understood from the sheer line drawing (FIG. 7).

When the vessel covered by this invention sails through the water, low-positioned bows 1 located in the bow section of the hull prevent transverse flow of water from under the hull, thus precluding the formation of the side splash at the stem.

In the zone of waterline intersection with the line of keel, owing to keel-shaped lines 3 (FIG. 4) of the central section of the bottom, transverse spreading of the onrushing flow of water takes place, resulting in the removal of the air entrapped under the bottom towards the bows. Owing to this, stable running (without air indraw) of the water-jet propeller or shallow-depth propelling screw is ensured. Flat lines 7 (FIG. 6) of the bottom stern section provide for a small draught of the vessels stern and good hydrodynamic characteristics of the vessel when sailing at transitional speeds or when planing.

The vessels shape in plan view (FIG. 2) is close to rectangular which provides for the utilization of the bow deck for the accommodation of a wheelhouse 8, embarkation platforms 9 and passenger quarters 10.

A high coefiicient of displacement of the hull having the above-specified lines ensures a small draught of the vessel while at rest, and outstanding hydrodynamic characteristics contributing-to the rising of the vessel in the water at transitional speeds and when planing.

The lines of the vessel invented by us permit of dispensing with piers and other similar shore facilities, since the vessel is able of directly contact the bank or shore by the bow, even if the bottom slope at the shore is as small as 3-5.

Moreover, when contacting the shore, the vessel is reliably retained against being swung by the current owing to the stem-shaped bows which cut into the bottom, thus making any additional mooring superfluous.

The vessels having the lines described herein can be powered by propellers of various types, including waterjets, propelling screws installed in a tunnel, exposed propelling screws installed at a small depth, and others.

-It should be borne in mind that the particular embodiment of the invention shown in the drawings (FIGS. l-7) is merely one of the possible and the preferable version of construction, and that there may be various other versions of embodiment without departing from the spirit and scope of this invention.

What is claimed is:

1. A small-draught vessel whose bottom is made concave in the bow section, while its stern section has a flat or almost flat shape, and the bottom is made keel-shaped amidships smoothly turning into concave lines in the bow section, and into fiat lines in the stern section.

2. A small-draught vessel claimed in claim 1, the bottom of said vessel having a general gradual rise towards the bow, said rise reaching up to the waterline and having 4 a length of not less than one-third of the vessel's overall length.

References Cited UNITED STATES PATENTS 2,181,463 11/1939 Pratt 114--56 ANDREW H. FARRELL, Primary Examiner.

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