DESC:FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENT RULES, 2003
COMPLETE SPECIFICATION
(See Section 10 and Rule 13)
Title of invention:

A MARINE VESSEL FOR SHALLOW WATER
Applicant:

Mazagon Dock Shipbuilders Limited
A company Incorporated in India under the Companies Act, 1956
Under Ministry of Defence,
(A Govt. of India Undertaking)
Having address:
Dockyard Road, Mazagon,
Mumbai - 400010, Maharashtra, India

The following specification describes the invention and the manner in which it is performed.
CROSS-REFERENCE TO RELATED APPLICATION AND PRIORITY

[001] The present application claims priority from Indian Patent application no. (201821041283) filed on 31st October, 2018.

TECHNICAL FIELD

[002] The present subject matter described herein, in general, relates to a marine vessel. More specifically, the marine vessel is for operations in shallow waters.

BACKGROUND

[003] Typically, it has always been a challenge to protect a waterlogged area and highly inhospitable terrains. It is identified that the creeks are only navigable by boats, movement of the creeks being dependent on the water level, given the strategic location and the need for faster response surmounting the problems posed by nature in this area. Thus, there has always been a need for designing of a marine vessel to give a shot in the arm in the waterlogged, shallow water, and highly inhospitable terrains.

SUMMARY

[004] Before the present a marine vessel for shallow water, is described, it is to be understood that this application is not limited to the particular systems, and methodologies described, as there can be multiple possible embodiments which are not expressly illustrated in the present disclosures. It is also to be understood that the terminology used in the description is for the purpose of describing the particular implementations or versions or embodiments only, and is not intended to limit the scope of the present application. This summary is provided to introduce aspects related to the marine vessel. This summary is not intended to identify essential features of the claimed subject matter nor is it intended for use in determining or limiting the scope of the claimed subject matter.

[005] In one implementation, a marine vessel comprises a hull, and a pair of steerable rudder propellers. The hull may be made of steel. hull has a rectangular cross section at a bow side and a tunnel stern section at a backside with a deck. The deck may be a cambered deck.

[006] Furthermore, the tunnel stern comprises of a crest and a trough at a bottom portion, and is raised to a half of the hull forming a curved section from the bottom portion of the tunnel stern to a bottom base of the hull. In another implementation, the pair of steerable rudder propellers are deck mounted. In one aspect, the plurality of steerable propellers are coupled to an outer surface of the crest. In another aspect, during operation, the tunnel stern directs a water flow on the pair of steerable rudder propellers in order to generate an adequate thrust for the marine vessel without any influence of the shallow water.

BRIEF DESCRIPTION OF THE DRAWINGS

[007] The foregoing detailed description of embodiments is better understood when read in conjunction with the appended drawings. For the purpose of illustrating of the present subject matter, an example of construction of the present subject matter is provided as figures; however, the invention is not limited to the specific system disclosed in the document and the figures.

[008] The present subject matter is described in detail with reference to the accompanying figures. In the figures, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The same numbers are used throughout the drawings to refer various features of the present subject matter.

[009] Figure 1 illustrates a side view of a marine vessel structure, in accordance with an embodiment of the present subject matter.

[0010] Figure 2 illustrates an isometric view of a marine vessel structure, in accordance with an embodiment of the present subject matter.

[0011] Figure 3 illustrates a schematic of a pair of steerable rudder propellers mounted on a deck, in accordance with an embodiment of the present subject matter.

DETAILED DESCRIPTION

[0012] Some embodiments of this disclosure, illustrating all its features, will now be discussed in detail. The words "travelling", “getting”, “forming” and other forms thereof, are intended to be equivalent in meaning and be open ended in that an item or items following any one of these words is not meant to be an exhaustive listing of such item or items, or meant to be limited to only the listed item or items.

[0013] It must also be noted that as used herein and in the appended claims, the singular forms "a," "an," and "the" include plural references unless the context clearly dictates otherwise. Although a marine vessel structure, similar or equivalent to those described herein can be used in the practice or testing of embodiments of the present disclosure, is now described. The disclosed embodiments for the marine vessel is merely example of the disclosure, which may be embodied in various forms.

[0014] Various modifications to the embodiment will be readily apparent to those skilled in the art and the generic principles herein may be applied to other embodiments for the marine vessel However, one of ordinary skill in the art will readily recognize that the present disclosure for the marine vessel is not intended to be limited to the embodiments described, but is to be accorded the widest scope consistent with the principles and features described herein.

[0015] As described above, there is a need to protect the waterlogged, shallow water, and highly inhospitable terrains along Indian Territory. Conventionally marine vessels like speedboats and other boats may be used, but speedboats and other boats cannot operate in shallow water region, waterlogged region, and highly inhospitable terrains, as the speedboats or other boats used in such low-level water condition, there is always a danger of grounding on rocks. In addition, the boats may not be travelling in adequate speed to defend the area. Thus, there is a need to overcome the limitation.

[0016] In one implementation, a marine vessel comprises a hull, and a pair of steerable rudder propellers. The hull may be made of steel. The hull has a rectangular cross section at a bow side and a tunnel stern section at a backside with a deck. The deck may be a cambered deck.

[0017] Furthermore, the tunnel stern comprises of a crest and a trough at a bottom portion, and is raised to a half of the hull forming a curved section from the bottom portion of the tunnel stern to a bottom base of the hull. In another implementation, the pair of steerable rudder propellers are deck mounted. In one aspect, the plurality of steerable propellers are coupled to an outer surface of the crest. In another aspect, during operation, the tunnel stern directs a water flow on the pair of steerable rudder propellers in order to generate an adequate thrust for the marine vessel without any influence of the shallow water.

[0018] In one embodiment, there may include an advantage, that is, the marine vessel is used in shallow water, thus, the danger of marine vessel grounding on rocks is eliminated, due to the design structure of the hull and the tunnel stern.

[0019] Now, referring to Figures 1-2, Figure 1 illustrates a side view 100 of a marine vessel structure. The marine vessel may be a floating border outpost. Figure 2 illustrates an isometric view 200 of the marine vessel. Further, the present subject is explained with reference to Figures 1 to 2, in order to maintain the readability of the present subject matter.

[0020] In one embodiment, various elements of the marine vessel structure for shallow water is illustrated. In one implementation, the marine vessel comprises a hull 102. The hull 102 comprise a bilge, and the bilge is circular.. In another embodiment, the hull has a petrol tank located inside the hull 102. The petrol tank comprises of one or more sensors and one or more pressure release valves. The petrol tank further comprise a petrol-dispensing unit. The petrol tank is located in an aft peak void space, outside a machinery space and at sufficient clearance inboard from all sides of the hull 102.

[0021] In one aspect, the hull 102 comprises a deck 104. One or more speedboats may be mounted on the deck 104. Further, one or more cabins may be located on the top surface of the deck 104. The hull 102 has a rectangular cross section at a bow side and a tunnel stern 106 section at a backside of the hull 102. In another aspect, the tunnel stern 106 comprises a crest 202 and a trough 204 at a bottom portion.

[0022] In one another aspect, the tunnel stern 106 is raised to a half of the hull 102 forming a curved section 108 from the bottom portion of the tunnel stern 106 to a bottom base 110 of the hull 102. Further, a wheelhouse (not shown) may be located on a second tier of the hull 102. Furthermore, the hull 102 have at least two rudder propellers.

[0023] Now referring to Figure 3, Figure 3 illustrates a schematic of a pair steerable rudder propellers 302 mounted on the deck 104. The pair of steerable rudder propellers 302 are deck 104 mounted. In one aspect, the pair of steerable propellers 302 are coupled to an outer surface of the crest 202. In another aspect, during operation, the tunnel stern 106 directs a water flow on the pair of steerable rudder propellers 302 in order to generate a thrust for the marine vessel.

[0024] In another implementation, the marine vessel structure may be made as per below dimensions mentioned in the table:

Length Overall 34.50 meter
Beam 9.50 meter
Depth 3.40 meter
Max Draft 1.20 meter

[0025] Exemplary embodiments discussed above may provide an advantage, this may include the following.

[0026] Some embodiments of the marine vessel provides high manoeuvrability and is suitable for operation in shallow waters.

[0027] Some embodiments of the marine vessel provides optimum thrust by the tunnel stern for a given draft.

[0028] Some embodiments of the marine vessel provides the customized tunnel stern design created for catering to the operation in shallow water at a speed of 8.5 knots.

[0029] Some embodiments of the marine vessel provide a large deck area.

[0030] Some embodiments of the marine vessel provides reduced wave marking resistance due to the design of the bow.
[0031] Further, bow is designed in order to reduce the bow waves i.e spoon bow. Furthermore, the sections of the bow have been narrowed to have an optimized balance between the resistance and displacement requirement and the deck area.

[0032] Some embodiments of the marine vessel structure is customized for long-range inland water mass transportation.

[0033] Some embodiments of the marine vessel structure provides an operational capability up to sea state 3 at a wave height of at least two meter and survival capability of up to sea state 7.

[0034] Some embodiments of the marine vessel structure provides speed more than 8.5 knots.

[0035] Some embodiments of the marine vessel provides an additional safety measure, provision for preventing overfilling of tanks, pressure testing of tank pressure release valve arrangement, tank bottom cooling, vapour sensors and the like is provided.

[0036] Some embodiments of the marine vessel structure provides a breadth of the marine vessel structure as high when compared to the normal river going vessels. The breadth to draft (B/T) ratio is 7.92 .

[0037] Some embodiments of the marine vessel provides accommodation for at least 37 persons.

[0038] Although implementations for the marine vessel have been described in language specific to structural features and/or methods, it is to be understood that the appended claims are not necessarily limited to the specific features or methods described. Rather, the specific features and methods are disclosed as examples of implementation for the marine vessel.
,CLAIMS:
1. A marine vessel for shallow water, wherein the marine vessel structure comprises:
a hull (102), wherein the hull comprises a deck (104), wherein the hull (102) has a rectangular cross section at a bow side and a tunnel stern (106) section at a back side of the hull (102), wherein the tunnel stern (106) comprises a crest (202) and a trough (204) at a bottom portion, wherein the tunnel stern (106) is raised to a half of the hull (102) forming a curved section (108) from the bottom portion of the tunnel stern (106) to a bottom base (110) of the hull (102);
a pair steerable rudder propellers (302), wherein the plurality of steerable rudder propellers (302) are deck (104) mounted, wherein the plurality of steerable propellers (302) are coupled to an outer surface of the crest (202);
wherein during operation, the tunnel stern (106) directs a water flow on the plurality of steerable rudder propellers (302) in order to generate a thrust for a marine vessel.

2. The marine vessel as claimed in claim 1, wherein the hull (102) comprises a bilge, wherein the bilge is circular.
3. The marine vessel as claimed in claim 1, wherein one or more speedboats are mounted on a top surface of the deck (104).
4. The marine vessel as claimed in claim 1, wherein a wheelhouse is located on a second tier of the hull (102).
5. The marine vessel as claimed in claim 1, wherein one or more cabins are located on the top surface of the deck (104).
6. The marine vessel as claimed in claim 1, wherein a petrol tank is located inside the hull (102), wherein the petrol tank comprises one or more sensors, wherein the petrol tank comprises one more pressure release valves, and wherein the petrol tank comprises a petrol dispensing unit.

7. The marine vessel as claimed in claim 1, wherein the hull (102) has at least two rudder propellers.