KR20140090396A - Non-ballast ship - Google Patents

Abstract

The present invention relates to a non-ballast ship which has no ballast tank therein, and comprises: a thruster system arranged on the stern of the ship; a machine room having utility mechanical equipment, which is required inside the ship, installed therein; a propulsion generator supplying propulsion to the thruster system and installed inside the ship; and a deck house arranged in the middle part of the ship and which is balanced with the thruster system, the propulsion generator, and the machine room to form a state of equilibrium by making the center of gravity of the ship placed below the waterline of a light ship. According to the present invention, the non-ballast ship prevents environmental contamination from being generated by ballast water and makes it unnecessary to have additional equipment to treat the ballast water and to perform a hard coating work, thereby rarely needing the trimming and healing of the ship as well as reducing ship-building costs.

Description

Non ballast ship {NON-BALLAST SHIP}

The present invention relates to a ship in which a ballast tank is not required, and more particularly, to a ship in which a ballast tank which does not require a ballast tank which can eliminate the ballast tank and thereby reduce drying and operating costs can be obtained.

In general, ships maintain stability when cargo is not loaded and apply ballast tanks for propulsion efficiency. That is, the ship is provided with a ballast system for adjusting the draft and trim (the phenomenon of inclination in the fore and aft direction of the ship when the cargo is loaded). Such a ballast system includes a plurality of ballast tanks and ballast And basically includes a ballast pump for supplying and discharging ballast water to and from the tank. This ballast tank is intended to carry a cargo safely by lowering the weight of the cargo by loading and unloading. Since several ballast tanks are formed symmetrically on the left and right sides of the ship, Sea water is stored without mutual exchange. In particular, by appropriately filling the ballast water, it is possible to adjust the fore and aft tilt of the ship to be horizontal or to adjust the resistance to be the smallest so that all vessels navigating the ocean must have several ballast tanks.

The ballast water supplied to adjust the draft and trim to the ballast tank is called the ballast water. In order to improve the operational stability and the propulsion efficiency of the ship, the empty ballast tanks which have no cargo are filled with seawater (water) And discharges this seawater again.

1 and 2 are sectional views of a ship 10 having a ballast tank 11 according to the related art as seen from a front side and a side view when a cargo 14 is unloaded and FIGS. Is a front view and a side view of a vessel (10) having a vessel (11) when loading a cargo (14). Hereinafter, a ship 10 having a conventional ballast tank 11 will be described with reference to the following.

As shown in FIGS. 1 and 2, when the cargo 14 of the cargo hold 13 is unloaded, the ballast tank 11 is filled with the ballast water 12. At this time, the weight of the ship 10 is satisfied by the ballast water 12, so that the waterline is secured even when the ballast water 12 is leaned.

Next, as shown in FIGS. 3 and 4, when the cargo 14 is shipped to the cargo hold 13, the ballast water 12 filled in the ballast tank 11 flows out to the outside. At this time, the weight of the ship 10 is satisfied by the cargo 14, and thus the water line suitable for the operation of the ship 10 is secured.

That is, when the cargo 14 is loaded on the ship 10, the center of gravity of the ship 10 is positioned below the sea level without filling the ballast water tank 12 with the ballast water 12, so that even if an external force such as a wave acts, The ballast tank 11 may be provided with ballast water (not shown) so that a certain portion of the ship 10 can be positioned below sea level as the cargo 14 is shipped, 12) are loaded and operated.

Accordingly, since the ship 10 having the ballast tank 11 according to the prior art uses general seawater as the ballast water 12, it can be used as a medium for propagating organisms or pathogens in a specific sea area to other seas . That is, the ballast water 12 filled in the ballast tank 11 may include various marine organisms and pathogens. Since the inflow and outflow of the ballast water 12 occur in different areas, the ballast water 12 ), The marine organisms or pathogens in a specific sea area flowing into the other sea area are caused to be disturbed by the environment and the ecosystem.

In short, there are several major problems in operating a ballast system including such ballast tanks.

First, the loading and unloading of the cargo is repeated according to the voyage of the ship. The ballast tank 56 is continuously filled with the sea water (ballast water) and discharged repeatedly. At this time, the sediment and marine life The solids remain in the form of sediment in the ballast tanks 56 during the operation of the ballast tanks 56. The various solids remaining in the ballast tanks 56 are discharged together with the seawater along with the seawater to disturb the surrounding marine ecosystem .

Secondly, in order to prevent international marine pollution, international regulations have been strengthened to ensure that the life span of all vessels after July 1, 2008 is 15 years or more. These international regulations on paintings increase the cost of drying.

Third, in order to prevent the propagation of harmful bacteria and destruction of ecosystems and to eliminate alien species, international regulations, which had been required to drain water in ballast tanks only at the berth, should be discharged only on the high seas, Since then, all vessels have been reinforced with regulations requiring the installation of ballast water treatment systems that use expensive filters, chemical biocides, electrolysis, ozone treatment, and ultraviolet (UV) irradiation. The installation of such a ballast water treatment device not only significantly increases the cost of the ship but also causes a problem of environmental pollution and destruction of ecosystem due to the additional maintenance cost of the system.

In addition, a ballast tank requires a large pump for inserting and removing seawater, which has a problem in that the capacity of the generator is increased.

In view of these problems, non-ballast ships without ballast water have been researched and developed. For example, it has been proposed that a large bottom slope is formed in the parallel portion of the hull so that the draft required for safe navigation can be obtained without a lack of ballast water even in the open state (for example, the Internet of the Japan Foundation Railway & Homepage of non-ballast ship R & D research outline report, Mar. 18, 2007 Issued by Japan Ship Technology Research Association Foundation and Testing Center)

Japan Foundation Creation Project Internet Homepage of the Railway and Fountain Agency R & D Research Outline of Non-Ballast Liner, Mar. 18 Mar. Issued and Testing Center of Japan Ship Technology Research Institute Non-ballast Since the line is supplemented by increasing the width of the ship by shortening the mass of goods produced by forming the bottom of the port side and the starboard side to be inwardly inclined and forming the bottom of the isosceles triangle in the longitudinal section, , The propeller diameter is reduced by about 10% compared with the conventional one in order to reduce the draft of the stern. Therefore, in order to supplement the deterioration of the propeller efficiency, .

Protecting ecosystems with non-ballasted lines / A non-ballast line from the University of Michigan's homepage at Transtex (operated by JR Information Systems) is located at the bottom of the hull, Diameter pipes are installed in the piping, the pipes are always corroded due to seawater because the pipes are always in the state of passing the seawater through the pipes. Therefore, the maintenance performance of the pipes is poor, and the habitat of aquatic organisms And there is a problem that aquatic organisms migrate to other countries in a short time. Furthermore, since the ratio of the pipe installed in the hull to the volume in the hull is large, there is a problem that the gross tonnage becomes small.

The bottom and the lateral wall are orthogonal to each other to divide the watertight recess for air storage and the air supply pipe connected from the air supply device installed above the hull The lower end of the air supply pipe, which is branched from the midway position and is equipped with each of the branched air valves, is open-circuited to the respective sections, and the air sides are adjusted by the information obtained from the water level monitoring apparatus installed at the bottom, The air volume of each segment is adjusted by sending air or intake air to the segment and the hull is floated on the water surface by the air layer in each segment so that the viscous resistance can be reduced at the time of sailing to enable economical navigation (See, for example, Japanese Patent Application Laid-Open No. 61-232982).

SUMMARY OF THE INVENTION The present invention has been made in view of the above and other problems of the related art, and it is an object of the present invention to provide a ship without a ballast tank, which comprises a thruster system arranged at the stern, And a propulsion generator installed in the ship to balance the thruster system, the propulsion generator, and the machine room so that the center of gravity of the ship is positioned below the collinear waterline and equilibrium is placed in the middle of the ship By avoiding the environmental pollution caused by the existing ballast water, it is possible to reduce the drying cost of the ship by not requiring separate additional equipment for ballast water treatment and difficult painting, Ballast tanks that do not require trimming and healing It is to provide a ship for the purpose.

According to an aspect of the present invention, there is provided a thruster system comprising: a thruster system disposed at a stern; a machine room in which a necessary utility mechanical equipment is installed in a ship; A propulsion generator installed in the ship and a deck house disposed in the middle portion of the ship so as to balance the thruster system, the propulsion generator, and the machine room so that the center of gravity of the ship is positioned below the collinear waterline, And a ballast tank.

In addition, the non ballast ship according to the present invention may be a deckhouse installed on a deck in a ship, a machine room in which utility mechanical equipment necessary for a ship is installed, a propulsion generator for generating electric power for propelling the ship, a thruster Wherein the deckhouse, the machine room, the propulsion generator, and the thruster system are disposed such that the center of gravity of the ship is located below the collinear waterline and is in equilibrium when the ship is not loaded with cargo .

The propulsion generator may be a fuel cell system, a nuclear propulsion system, or a superconducting propulsion system, and the propulsion generator may be a combination of at least one of the power generation systems except the internal combustion engine.

The thruster system may be any one of a rudder and propeller system, an azimuth thruster and an azimuth propulsion system.

The thruster system may be movable up and down to maintain the proper depth of the ship in accordance with the waterline.

There is an inboard space between the deckhouse and the propulsion generator and the machine room so that the propulsion generator and the machine room can be moved up and down in the space to lower the center of gravity of the ship.

The trimming and heeling accuracy of the ship is measured by trimmers and heeling sensors located at the forefront and the stern. Optimum trimming and healing calculation equipment of the navigation room and optimal trimming and healing value In accordance with the data entered by the operator of the ship in the navigating room, the conveying weight installed on the deck or double bottom space of the ship so as to be transportable along the conveying path, And a trimming / heeling adjustment device capable of adjusting the trimming and healing of the ship by moving in the forward, backward, leftward and rightward directions.

According to another embodiment, a ship without a ballast tank according to the present invention comprises a deckhouse installed on a deck in a ship, a machine room in which utility mechanical equipment necessary for the ship is installed, a propulsion generator for generating electric power for propelling the ship, Wherein the deckhouse, the machine room, the propulsion generator and the thruster system are arranged such that trimming and healing of the vessel are in equilibrium.

The thruster system may further include a hydraulic device or a gear device for moving the thruster system up and down. The thruster system is moved up and down to maintain the proper depth of the ship in accordance with the waterline by the operation of the hydraulic device or the gear device .

The trimming and healing detection sensors located at the forefront and the stern are used to measure the trim and heel of the ship and the optimum trimming and healing calculation equipment of the navigation room are used to calculate the optimal trimming and healing values according to the operating conditions, In accordance with the data entered by the operator of the ship, the conveyed weight installed on the deck or double bottom space of the ship so as to be transportable along the conveying path is moved forward, backward and leftward and rightward in the ship's deck or double bottom space And a trimming / heeling adjustment device capable of adjusting trimming and healing of the ship.

There is an inboard space between the deckhouse and the propulsion generator and the machine room so that the propulsion generator and the machine room can be moved up and down in the space to lower the center of gravity of the ship.

According to another embodiment, a ship without a ballast tank according to the present invention can be arranged in a balanced manner in a deckhouse, a machine room, a propulsion generator and a thruster system so that the center of gravity is positioned below the waterline in an equilibrium state.

The present invention can fundamentally prevent environmental pollution caused by ballast water, and has the effect of reducing the cost of ship construction by eliminating the extra cost required for the treatment of ballast water and the severe painting work in the ballast tank. In addition, since ballast tanks are eliminated, this space can be used as a cargo space to increase the cargo loading efficiency and reduce the size of the vessel, thus drastically reducing the cost of ship construction.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view of a ship having a ballast tank according to the prior art when it is tilted (when unloading a cargo); Fig.
Fig. 2 is a longitudinal sectional view of a ship having the ballast tank shown in Fig. 1. Fig.
Fig. 3 is a transverse sectional view of a ship having a ballast tank shown in Fig. 1 when loaded (cargo loading). Fig.
Fig. 4 is a longitudinal sectional view of a ship having the ballast tank shown in Fig. 3;
5 is a conceptual diagram of a deck house, a propulsion generator, a machine room, and a non-ballast ship showing the position of the center of gravity according to the present invention.
6 is a plan view of the non-ballast ship shown in Fig.
7 is a vertical sectional view showing the thruster system and the center of gravity according to the load line and the collinear waterline of the non-ballast ship according to the present invention.
8 is a longitudinal sectional view of a non ballast ship having a thrust system according to another embodiment of the present invention.
Figure 9 is a top view of a non ballast ship having a trimming / healing control system in accordance with another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention unclear.

5 is a conceptual diagram of a deck house, a propulsion generator, a machine room, and a non-ballast ship showing the position of the center of gravity according to the present invention. 5, a ship 100 according to the present invention is a ship without a ballast tank, and includes a thruster system 140 disposed at the stern, a machine room 130 where necessary utility machinery equipment is installed in the ship 100, And a thruster system 140 to be in an equilibrium state while the center of gravity G of the ship 100 is positioned below a collinear water line and a propulsion generator 120 installed in the ship to provide propulsive force to the thruster system. And a deck house 110 disposed in the middle of the ship in balance with the generator 120 and the machine room 130.

Here, the propulsion generator 120 may be a conventional diesel engine or a steam turbine, and may be a power generation system such as a fuel cell system, a nuclear propulsion system, and a superconducting propulsion system. In the machine room 130, all the heavy mechanical equipment such as the auxiliary generator, the water conditioner, the cooling / air conditioning system, the main hydraulic machine, and the main pump may be installed in addition to the equipment placed in a normal machine room. The thruster system 140 may be a conventional rudder and propeller system, and in the present invention preferably an azimuth thruster, including an azimuth system. In conventional rudder and propeller systems, the shafts that are drive shafts are connected from the main engine, and most of the engines are diesel engines or steam turbines (in this case, the engine room is most deviated to the stern axis) Considering the weight, the deck house and the machine room can be positioned considerably on the side of the bow. Accordingly, in the present invention, the fuel cell system, the azimuth thruster type propulsion generator 120, and the thruster system 140 can be regarded as the most preferable embodiments in which the deckhouse can be located at the center of the ship.

Generally, the deckhouse 110, the propulsion generator 120, the machine room 130 equipped with the utility machine, and the thruster system 140 are the heaviest components in the ship. The deck house 110 is typically installed on the aft deck, and the propulsion system is connected to a thruster system such as a rudder and propeller system or an azimuth thruster, and is disposed in the stern side engine room. . Therefore, existing ships should be trimmed by ballast water in the ballast tanks during the ballasting, and the heeling should be adjusted so that the thruster system such as the propeller is adjusted at a certain depth. The ballast water must be filled.

Since the ship 100 according to the present invention does not have a conventional ballast tank, it is basically in equilibrium at the time of the collinear operation in which the cargo is not loaded, that is, the balance of the bow, stern, . Further, stability can be achieved by arranging the center of gravity G below the collinear waterline even in the collinear state. The equilibrium state of the trimming and healing and the arrangement below the water line of the center of gravity are the deck house 110, the propulsion generator 120, the machine room 130 equipped with the utility machine, and the thruster system 140, Lt; / RTI >

6 is a plan view of the non-ballast ship shown in Fig. Referring to FIG. 6, the deck house 110 is disposed near the center of the ship so that the center of gravity is located near the center of the ship. The position of the deck house 110 may be moved from the center of the ship to the bow side or from the center of the ship to the stern side depending on the position of the propulsion generator 120 and the machine room 130 relative to the thruster system 140.

As described above, in the case of the embodiment implemented in accordance with the present invention with the conventional internal combustion engine (diesel, steam turbine, dual fuel system, etc.) and the rudder and propeller system, Equilibrium placement of the machine room may be difficult. However, when implemented in accordance with the present invention in a power generation propulsion system such as a fuel cell system, a nuclear propulsion system, a superconducting power generator, etc., and an azimuth thruster, particularly an azimuth system, the deck house 110, the propulsion generator 120, ) Can be positioned in the approximate center of the ship, and arrangements according to this embodiment have no problems with trimming and healing if the cargo loading and unloading is done in consideration of equilibrium, thus eliminating the need for a ballast tank.

7 is a vertical sectional view showing the thruster system and the center of gravity according to the load line and the collinear waterline of the non-ballast ship according to the present invention. Referring to FIG. 7, the center of gravity G of the vessel is below the load line 160 and below the bulk line 158. The ship according to the present invention can be stably operated since the center of gravity G is positioned below the waterline 160 in the full state where the cargo is loaded and the equilibrium is maintained. Even when the cargo is in a collimated state, the waterline 158 The center of gravity (G) is located below the center of gravity, and the stability is maintained. Also, by configuring the thruster system 140, such as the azimuth thruster, to be movable up and down, when the balloon waterline 158 is too low, the thruster system 140 can be moved downward and positioned at an appropriate depth, Can be stably promoted. To this end, a hydraulic device or a gear device for vertically moving the thruster system is additionally provided at the stern of the ship, and the thruster system is operated by the hydraulic device or the gear device to maintain the proper depth of the ship according to the waterline As shown in FIG. The increase in the weight of the stern due to the addition of the hydraulic device or the gear device is considered in the basic design of the ship according to the present invention, so that the deckhouse, the propulsion generator, the machine room, . As described above, the hydraulic device or the gear device capable of raising and lowering the thruster system is an ordinary system that is widely used in other fields as being installed in a ship, and thus a detailed description thereof will be omitted herein. That is, the lifting and lowering moving device includes a hydraulic system for expanding and contracting a target object by hydraulic pressure, a gear device such as a bevel worm gear for moving a target by moving linear motion, , And a telescopic type expansion / contraction system.

8 is a longitudinal sectional view of a non ballast ship having a thrust system according to another embodiment of the present invention. Referring to FIG. 8, it can be seen that the thruster system 140 is implemented as a rudder and propeller system. In this case, a motor for rotating the propeller by receiving electric power from the propulsion generator 120 may be located at the stern, or a drive shaft for transmitting the rotational force may be built up to the propeller when the motor is located at the propulsion generator. In this case, considering the weight of the drive shaft, the propeller, the rudder, and the rudder drive system, the deck house 110, the propulsion generator 120, and the machine room 130 can be moved to the forward side considerably. Although it is shown on the drawing that the ballast tank is located on the side of a rather small bow for convenience, if the ballast tank is not required in a state in which all the components are equilibrated, a layout which is highly biased toward the bow side can be regarded as being included in the present invention. 7, by configuring the thruster system 140, such as a rudder and a propeller, to be movable up and down, when the balloon waterline 158 becomes too low, the thruster system 140 is moved downward By positioning, the ship can be propelled stably. To this end, a hydraulic device or a gear device for moving the rudder and the propeller up and down is additionally installed at the stern of the ship. The rudder and the propeller are operated by the hydraulic device or the gear device so as to maintain the proper depth of the ship Lt; / RTI > The increase in the weight of the stern due to the addition of the hydraulic device or the gear device is considered in the basic design of the ship according to the present invention, so that the deckhouse, the propulsion generator, the machine room, .

Figure 9 is a top view of a non ballast ship having a trimming / healing control system in accordance with another embodiment of the present invention. 9, there is shown a trimming / healing control system 170 including a conveying weight 171 and a conveying path 172 of the conveying weight 171. The trimming / heeling control system 170 measures the degree of trim of the ship through a trimming / heeling detection sensor located at the bow and stern of the ship, not shown, and measures the trim condition of the ship through the optimum trimming / After calculating the optimum trimming / healing value, the heavy items are moved in the forward and backward directions of the ship in the double bottom space of the ship according to the data inputted by the ship operator, The operator of the ship can make adjustments as desired. This trim / heel regulating system 170 may be placed on the top deck for some types of vessels, and in some cases may be embodied in the double bottom of the vessel since there is no ballast tank. The conveying weight 171 may include motors and brakes for movement and stopping and its operation may be controlled by the information transmitted from the central processing unit in accordance with the data input by the sensor for trimming / have.

It is to be understood that the present invention is not limited to the specific preferred embodiments described above and that various modifications can be made by those skilled in the art without departing from the scope of the present invention as claimed in the claims. And such changes are, of course, within the scope of the claims.

100: Ship
110: Deckhouse
120: propulsion generator
130: Machine room
140: thruster system
158: Ballast waterline
160: Load line
170: trimming / healing adjustment device
171:
172: Feeding path (of conveying weight)
G: Center of gravity

Claims (19)

A deckhouse installed on the deck of a ship, a machine room in which the utility machinery equipment necessary for the ship is installed, a propulsion generator for generating electric power for propelling the ship, a thruster system for propelling the ship, As a non ballast ship,
Wherein the deckhouse, the machine room, the propulsion generator, and the thruster system are arranged such that the center of gravity of the ship is located below the collinear waterline and equilibrium when the ship is colloquially loaded with no cargo.
Non ballast ship.
The method according to claim 1,
Wherein the propulsion generator is any one of a fuel cell system, a nuclear propulsion system, and a superconducting propulsion system
Non ballast ship.
The method according to claim 1,
Wherein the propulsion generator is at least one of a power generation system excluding an internal combustion engine
Non ballast ship.
4. The method according to any one of claims 1 to 3,
Characterized in that the thruster system is one of a rudder and propeller system, an azimuth thruster and an azimuth propulsion system
Non ballast ship.
5. The method of claim 4,
Further comprising a hydraulic device or gear device for moving the thruster system up and down,
The thruster system moves up and down to maintain the proper depth of the ship in accordance with the waterline by the operation of any one of the hydraulic device, the gear device for converting rotational motion into linear motion, the motor and wire device, and the telescopic expansion device Characterized by
Non ballast ship.
5. The method of claim 4,
Characterized in that there is an inboard space between the deckhouse, the propulsion generator and the machine room so that the propulsion generator and the machine room can be moved up and down in the space to lower the center of gravity of the vessel
Non ballast ship.
The method according to claim 1,
The trimming and heeling accuracy of the ship is measured by trimmers and heeling sensors located at the forefront and the stern. Optimum trimming and healing calculation equipment of the navigation room and optimal trimming and healing value In accordance with the data entered by the operator of the ship in the navigating room, the conveying weight installed on the deck or double bottom space of the ship so as to be transportable along the conveying path, Further comprising a trimming / heeling adjustment device capable of adjusting the trimming and healing of the ship by moving in the forward, backward and leftward and rightward directions
Non ballast ship.
A deckhouse installed on the deck of a ship, a machine room in which the utility machinery equipment necessary for the ship is installed, a propulsion generator for generating electric power for propelling the ship, a thruster system for propelling the ship, As a non ballast ship,
Wherein the deck house, the machine room, the propulsion generator and the thruster system are arranged such that trimming and healing of the ship are in an equilibrium state
Non ballast ship.
9. The method of claim 8,
Wherein the thruster system is movable up and down so as to maintain an appropriate depth of the ship in accordance with a waterline
Non ballast ship.
9. The method of claim 8,
The trimming and healing detection sensors located at the forefront and the stern are used to measure the trim and heel of the ship and the optimum trimming and healing calculation equipment of the navigation room are used to calculate the optimal trimming and healing values according to the operating conditions, In accordance with the data entered by the operator of the ship, the conveyed weight installed on the deck or double bottom space of the ship so as to be transportable along the conveying path is moved forward, backward and leftward and rightward in the ship's deck or double bottom space Further comprising a trimming / heeling adjustment device capable of adjusting trimming and healing of the ship
Non ballast ship.
9. The method of claim 8,
Characterized in that there is an inboard space between the deckhouse, the propulsion generator and the machine room so that the propulsion generator and the machine room can be moved up and down in the space to lower the center of gravity of the vessel
Non ballast ship.
As ships without ballast tanks,
Characterized in that the deckhouse, the machine room, the propulsion generator and the thruster system are arranged in balance so that the center of gravity is in equilibrium and below the waterline
Non ballast ship.
As ships without ballast tanks,
A thruster system disposed at the stern,
A machine room in which necessary utility machinery equipment is installed in the ship,
A propulsion generator provided in the ship to provide propulsion to the thruster system,
And a deckhouse disposed at an intermediate portion of the ship in such a manner as to be balanced with the thruster system, the propulsion generator, and the machine room so that the center of gravity of the ship is positioned below the collinear waterline and is in an equilibrium state
Non ballast ship.
14. The method of claim 13,
Wherein the propulsion generator is any one of a fuel cell system, a nuclear propulsion system, and a superconducting propulsion system
Non ballast ship.
14. The method of claim 13,
Wherein the propulsion generator is at least one of a power generation system excluding an internal combustion engine
Non ballast ship.
16. The method according to any one of claims 13 to 15,
Characterized in that the thruster system is one of a rudder and propeller system, an azimuth thruster and an azimuth propulsion system
Non ballast ship.
17. The method of claim 16,
Further comprising a hydraulic device or gear device for moving the thruster system up and down,
Wherein the thruster system is moved up and down by an operation of the hydraulic device or the gear device so as to maintain an appropriate depth of the ship in accordance with a waterline
Non ballast ship.
17. The method of claim 16,
Characterized in that there is an inboard space between the deckhouse, the propulsion generator and the machine room so that the propulsion generator and the machine room can be moved up and down in the space to lower the center of gravity of the vessel
Non ballast ship.
As ships without ballast tanks,
The deckhouse, the machine room, the propulsion generator and the thruster system are arranged in a balanced manner so that the center of gravity of the ship is positioned below the collinear waterline and equilibrium.
Non ballast ship.

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