Ships and sail structures

Abstract

To provide a ship and sail structure that reduce costs and allow for easy installation of sails. [Solution] In the vessel 1, the soft sail 40 is installed using existing column members 30 located on the upper deck 19. That is, the soft sail 40 can be installed using the existing column members 30 on the vessel 1 without having to add large sails such as rotor sails or dedicated sail-supporting members such as masts to the vessel 1. Therefore, the cost required to install the sail can be significantly reduced. In addition, by effectively utilizing the existing column members 30, the soft sail 40 can be easily installed. As a result, the position and orientation of the soft sail 40 can be easily changed by effectively utilizing the existing column members 30. Thus, costs can be suppressed and sails can be easily installed.

Description

Technical Field

[0001] The present invention relates to a ship and a sail structure.

Background Art

[0002] In recent years, the movement towards stricter marine environmental regulations in the shipping industry has been progressing, and wind power that does not emit GHG has attracted attention. In response, technologies using rigid sails, rotor sails, towing kites, etc. that utilize wind power may be adopted. However, such mechanisms require a large cost for installation and deployment.

[0003] Therefore, as described in Patent Document 1, ships using soft sails may be adopted. This ship installs a sail mast on a crane post and installs a soft sail on the sail mast.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, the above-mentioned ship has a problem that it is costly because it is necessary to additionally provide a sail mast on the crane post. Furthermore, the lower end of the soft sail is connected to the boom of the crane. Therefore, when changing the direction of the soft sail according to the wind direction, it is necessary to rotate the boom and the sail mast itself. Therefore, it has been necessary to consider safety. Therefore, easy installation of the sail has been demanded so as to reduce such considerations.

[0006] Therefore, an object of the present invention is to provide a ship and a sail structure that can suppress costs and easily install a sail.

Means for Solving the Problems

[0007] The vessel according to the present invention is equipped with a soft sail installed using existing column members located on the upper deck.

[0008] In the vessel according to the present invention, the soft sail is installed using existing column members located on the upper deck. That is, the soft sail can be installed using existing column members on the vessel without adding large sails such as rotor sails or dedicated sail-supporting members such as masts to the vessel. Therefore, the cost required to install the sail can be significantly reduced. Furthermore, by effectively utilizing existing column members, the soft sail can be easily installed. As a result, the position and orientation of the soft sail can be easily changed by effectively utilizing existing column members. Therefore, safety can be ensured compared to changing the position of the soft sail by rotating the boom of a crane. In summary, costs can be suppressed and sails can be easily installed.

[0009] A cylindrical crane post, configured to be non-rotatable, may be used as the column member, and the soft sail may be installed so as to enclose the crane post. In this case, the soft sail can change direction by swiveling in each direction according to the wind direction, centered on the cylindrical crane post. At this time, because a non-rotatable crane post is used, the soft sail can change direction while ensuring safety without swiveling the boom.

[0010] As column members, a center post (crane post) and side posts are used. The soft sail may be supported at its base end by the crane post and connected at its tip end to the side posts via ropes. In this case, the soft sail can be easily controlled by pulling it from the side post side via ropes, thereby applying the necessary tension. Furthermore, the tension on the soft sail can be adjusted more easily by pulling the rope with a winch or the like than when working manually.

[0011] Soft sails may be positioned at a distance from structures that interfere with the airflow, so as not to be affected by wind interference. In this case, the soft sails can generate thrust while reducing the influence of the structures.

[0012] A rib may be placed between the windward and leeward sides of the soft sail to maintain its shape. In this case, the rib can maintain the shape of both the windward and leeward sides of the soft sail while keeping costs down.

[0013] A soft sail may be provided with a mainsail and a jib sail on the opposite side of a mortar member. In this case, the jib sail can adjust the direction of the wind flowing over the mainsail and accelerate it. Therefore, the pressure difference between the windward and leeward sides of the mainsail can be increased, and greater lift can be obtained.

[0014] The sail structure according to the present invention uses existing column members located on the upper deck of a ship to install a soft sail. This sail structure allows for the same functions and effects as the aforementioned ship to be obtained. [Effects of the Invention]

[0015] According to the present invention, it is possible to provide a ship and a sail structure that can reduce costs and easily install sails. [Brief explanation of the drawing]

[0016] [Figure 1] This is a schematic cross-sectional view showing an example of a ship according to an embodiment of the present invention. [Figure 2] This is a detailed perspective view of the area around the crane post. [Figure 3] This is a diagram illustrating the thrust generated by soft sails. [Figure 4] This is a perspective view showing a detailed view of the area around the crane post in a modified example of the vessel. [Figure 5] This is a perspective view showing a detailed view of the area around the crane post in a modified example of the vessel. [Figure 6]In the ship according to the modification example, it is a perspective view showing the periphery of the crane post in detail. [Figure 7] It is a diagram for explaining the thrust generated by the soft sail. [Figure 8] It is a perspective view of the ship according to the modification example. [Figure 9] In the ship according to the modification example, it is a perspective view showing the ribs of the soft sail. [Figure 10] In the ship according to the modification example, it is a perspective view showing the periphery of the crane post in detail. [Figure 11] In the ship according to the modification example, it is a perspective view showing the periphery of the crane post in detail. [Figure 12] It is a perspective view for explaining the connection structure of the jib sail. [Figure 13] It is a diagram for explaining the thrust generated by the soft sail.

Mode for Carrying Out the Invention

[0017] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the following description, the terms "front" and "rear" correspond to the traveling direction of the hull, the term "side" corresponds to the width direction of the hull, and the terms "upper" and "lower" correspond to the vertical direction of the hull."

[0018] Referring to FIG. 1, the basic configuration of the ship according to the embodiment of the present invention will be described. FIG. 1 is a schematic cross-sectional view showing an example of the ship according to the embodiment of the present invention. The ship 1 is a ship that transports petroleum-based liquid cargo such as crude oil and liquefied gas, for example, an oil tanker. Note that the ship is not limited to an oil tanker, and may be various types of ships such as a bulk carrier that transports ore or coal, an LNG ship, a car carrier, etc.

[0019] As shown in Figure 1, the vessel 1 comprises a hull 11 and a propeller 12. The hull 11 has a bow 2, a stern 3, an engine room 4, and a cargo room 6. An upper deck 19 is provided on the upper part of the hull 11. The bow 2 is located on the forward side of the hull 11. The stern 3 is located on the aft side of the hull 11.

[0020] The propulsion system 12 mechanically generates thrust for the hull 11, and a screw propeller is used, for example. The propulsion system 12 is installed below the waterline (water surface of the sea W) at the stern 3 when propelling. A rudder 15 for adjusting the direction of travel is also installed below the waterline at the stern 3.

[0021] The engine room 4 is located adjacent to the bow of the stern section 3. The engine room 4 is a compartment for housing the main engine 16 that provides driving force to the propeller 12. The cargo room 6 is located between the bow section 2 and the engine room 4. The cargo room 6 is a compartment for storing cargo. The cargo room 6 is divided into multiple cargo spaces 26 and multiple ballast tanks 27 by employing a double hull structure of outer plating 20 and inner bottom plate 21. The cargo spaces 26 are for loading cargo to be transported by the ship 1. The ballast tanks 27 store an amount of ballast water according to the size of the ship in order to adjust the draft, etc.

[0022] The vessel 1 is equipped with a living quarters 22 and a funnel 23 on the upper deck 19, in the location corresponding to the engine room 4. The living quarters 22 are a space for the crew to live in. The living quarters 22 is a structure that extends upward from the upper deck 19. Note that the arrangement of the living quarters 22 and other components is not limited to this embodiment.

[0023] The vessel 1 is equipped with column members 30 on the upper deck 19. The column members 30 are elongated members that extend upward from the upper deck 19. The shape of the column members is not particularly limited, and various shapes can be adopted, such as cylindrical, rectangular prism, or polygonal shapes other than rectangular prisms. In this embodiment, the crane posts 31 and side posts 34 of the crane 32 are given as examples of column members 30.

[0024] The crane 32 comprises a crane post 31, a cargo handling section 33, and a movable section 36. The crane post 31 is a cylindrical member extending upward from the upper deck 19. The crane post 31 is fixed to the upper deck 19 and is configured not to rotate. A movable section 36 is provided at the upper end of the crane post 31. The cargo handling section 33 is provided at the upper end of the crane post 31 via the movable section 36. The cargo handling section 33 is a mechanism for handling cargo. The cargo handling section 33 has a boom section 33a extending in any direction from the movable section 36, and a lifting section 33b provided via a wire from the tip of the boom section 33a. The movable section 36 is a mechanism for moving the cargo handling section 33. The movable section 36 rotates the boom section 33a of the cargo handling section 33 around the crane post 31. Furthermore, the movable part 36 raises and lowers the boom part 33a of the cargo handling part 33.

[0025] Figure 2 is a perspective view showing the area around the crane post 31 in detail. As shown in Figure 2, the crane post 31 is positioned as a center post at approximately the center in the width direction on the upper deck 19. Side posts 34 are provided on one edge of the upper deck 19 in the width direction. Multiple side posts 34 (three in this case) are provided on this edge. The multiple side posts 34 are positioned spaced apart from the crane post 31 on one side in the width direction. The multiple side posts 34 are also spaced apart from each other at a predetermined pitch in the front-rear direction. However, the front-rear position and pitch of the side posts 34 are not particularly limited. The lateral position of each side post 34 is also not particularly limited. The number of side posts is also not particularly limited. The side posts 34 extend upward from the edge of the upper deck 19. The side posts 34 are, for example, members for loading timber. The side posts 34 have a smaller diameter than the crane post 31. In the example shown in Figure 2, a structure 37 is provided that extends from a position close to the crane post 31 to both sides in the lateral direction, reaching near the edges of the upper deck 19. The height of the upper end of the structure 37 is positioned lower than the upper end of the crane post 31 and the upper end of the side post 34.

[0026] The vessel 1 is equipped with a sail structure 100. The sail structure 100 is constructed by installing a soft sail 40 using existing column members 30 located on the upper deck 19 of the vessel 1. The vessel 1 is equipped with a soft sail 40 installed using existing column members 30 located on the upper deck 19. The soft sail 40 is a component that generates thrust by receiving wind force. The soft sail 40 is installed in an extended state so that it can receive wind using the existing column members 30. Furthermore, the direction in which the soft sail 40 is extended is adjusted according to the desired direction of travel and the wind direction. As a result, the soft sail 40 propels the hull 11 in the desired direction of travel by wind force.

[0027] Here, existing column members 30 refer to column members installed for purposes other than installing the soft sail 40. In other words, existing column members 30 are column members that are used to perform their original function even if the soft sail 40 is not installed. In this embodiment, the crane post 31 has the original function of supporting the cargo handling section 33. The side post 34 has the original function of supporting the loaded timber. Therefore, column members specifically for installing the soft sail 40 do not fall under the category of existing column members 30. For example, the mast is a column member specifically for installing the soft sail 40, and therefore does not fall under the category of existing column members 30. Furthermore, the soft sail 40 is a sail made of an irregularly shaped sheet-like material such as cloth or a resin sheet. The soft sail 40 can be easily stored by rolling it up or folding it. A rigid sail that maintains its shape even when subjected to wind force does not fall under the category of soft sail 40.

[0028] In the example shown in Figure 2, the soft sail 40 is supported at its base end 40a by the crane post 31, and its tip end 40b is connected to the side post 34 via a rope 42. The base end 40a of the soft sail 40 is supported by a shaft member 43. The shaft member 43 is a long member extending in the vertical direction. In the example shown in Figure 2, the upper end of the shaft member 43 is supported by the crane post 31, and the lower end of the shaft member 43 is supported by the upper deck. The shaft member 43 is inclined with respect to the crane post 31. However, the shaft member 43 only needs to be supported by the crane post 31, and the positions at which the upper and lower ends are supported are not particularly limited. The shaft member 43 can store the soft sail 40 by rolling it up. The shaft member 43 can wind up and unwind the soft sail 40 by rotating. The soft sail 40 spreads outwards from the shaft member 43. In the example shown in Figure 2, the soft sail 40 spreads outward in the width direction from the shaft member 43. However, the direction in which the soft sail 40 spreads is not particularly limited.

[0029] The rope 42 is drawn out from one of the multiple side posts 34. The rope drawn out from the side post 34 is connected to the tip 40b of the soft sail 40 at the other end. In this embodiment, rope 42A is drawn out from the intermediate section 34a of the front side post 34, and rope 42B is drawn out from the intermediate section 34b of the rear side post 34. Rope 42A extends from the intermediate section 34a along the front side post 34 towards the lower end. Rope 42B extends from the intermediate section 34b towards the lower end of the front side post 34. Ropes 42A and 42B extend from near the lower end of the front side post 34 towards the lower end of the crane post 31 and are connected to the winch 44. The tension of ropes 42A and 42B can be adjusted by driving the winch 44. By adjusting the tension of ropes 42A and 42B, the shape and orientation of the soft sail 40 can be adjusted. Furthermore, the winch 44 can change the shape and orientation of the soft sail by adjusting the tension of rope 42A and rope 42B, respectively. For example, increasing the tension of rope 42A can move the position of the tip 40b forward. Increasing the tension of rope 42B can move the position of the tip 40b aft. The winch can be installed at any position on the vessel 1. Thus, the tip 40b of the soft sail 40 is supported by two ropes 42A and 42B. However, the number of ropes 42 connected to the tip 40b of the soft sail 40 is not particularly limited; it may be one rope or three or more. Also, the side post 34 from which the rope 42 is pulled out is not particularly limited, and the combination of side posts 34 from which the rope 42 is pulled out is not particularly limited. The ropes may also be operated manually without using a winch. In the case of manual operation, there is no need to use a winch, so the installation space for the winch and the cost of introducing a winch can be reduced.

[0030] The sail structure 100 comprises a soft sail 40 and various members used to install the soft sail 40. In this embodiment, the sail structure 100 comprises the soft sail 40, column members 30 (here, a crane post 31 and side posts 34), a shaft member 43, and various ropes.

[0031] Figure 3 is a top view of the sail structure shown in Figure 2. Referring to Figure 3, the relationship between the orientation of the soft sail 40 and the wind direction will be explained. As shown in Figure 3, the soft sail 40 has a curved shape such that the windward side 40c at the front is the outer surface and the leeward side 40d at the rear is the inner surface. Wind WD blows onto the soft sail 40 from right to left. At this time, the flow velocity FW1 of the wind on the windward side 40c is large, and the flow velocity FW2 of the wind on the leeward side 40d is small. A pressure difference is created due to the difference in flow velocity between the windward side 40c and the leeward side 40d, and a lift force LF is generated diagonally forward to the left. Of this lift force LF, it acts as a thrust force DF with respect to the course (forward). By adjusting the orientation of the soft sail 40 according to the wind direction WD, the desired thrust force DF can be obtained.

[0032] Here, the living quarters 22 shown in Figure 1 have a height extending from the upper deck 19 to a predetermined number of levels, and the width of the living quarters 22 is at least greater than that of the crane post 31. Therefore, the living quarters 22 are considered a structure that interferes with the airflow. A structure that interferes with the airflow is a structure that, when wind WD (see Figure 3) blows onto the ship 1, causes the wind direction in the area surrounding the structure to be disturbed in a direction different from the original wind WD. The crane post 31 may be positioned away from the living quarters 22 to a location where it is not affected by the wind interference caused by the living quarters 22. As a result, the soft sail 40 (see Figure 2) is positioned away from the living quarters 22 to a location where it is not affected by the wind interference caused by the living quarters 22. Specifically, the crane post 31 on which the soft sail 40 is attached is positioned at a location at least the length of the soft sail 40 forward from the front end of the living quarters 22.

[0033] Next, the operation and effects of the vessel 1 according to this embodiment will be described.

[0034] In the vessel 1 according to this embodiment, the soft sail 40 is installed using existing column members 30 located on the upper deck 19. That is, the soft sail 40 can be installed using existing column members 30 on the vessel 1 without adding large sails such as rotor sails or dedicated sail-supporting members such as masts to the vessel 1. Therefore, the cost required to install the sail can be significantly reduced. In addition, by effectively utilizing the existing column members 30, the soft sail 40 can be easily installed. As a result, the position and orientation of the soft sail 40 can be easily changed by effectively utilizing the existing column members 30. For example, the orientation of the soft sail 40 can be easily changed by changing the side post 34 from which the rope 42 is pulled out among the multiple side posts 34. Therefore, safety can be ensured compared to changing the position of the soft sail 40 by rotating the boom section 33a of the crane 32. In summary, costs can be suppressed and sails can be easily installed.

[0035] As the column members 30, a center post, which is a crane post 31, and side posts 34 are used. The soft sail 40 may be supported at its base end 40a on the crane post 31 and connected at its tip end to the side post 34 via a rope 42. In this case, by pulling the soft sail 40 from the side post 34 via the rope 42, it is possible to easily apply the tension necessary to control the soft sail 40. Furthermore, by pulling the rope 42 with a winch or the like, the tension on the soft sail 40 can be adjusted more easily than when the work is done manually.

[0036] The soft sail 40 may be positioned at a distance from the living quarters 22 (structure) that interferes with the airflow, to a position where it is not affected by wind interference. In this case, the soft sail 40 can generate thrust while reducing the influence of the living quarters 22.

[0037] In this embodiment, the sail structure 100 is installed using existing column members 30 located on the upper deck 19 of the ship 1. This sail structure 100 provides the same functions and effects as the ship 1 described above.

[0038] The present invention is not limited to the embodiments described above.

[0039] For example, in the embodiment described above, the soft sail 40 was supported at its base end 40a by the crane post 31. Alternatively, as shown in Figure 4, the soft sail 40 may be supported at its base end 40a by the side post 34. The upper end of the shaft member 43 is supported by the front side post 34, and the lower end of the shaft member 43 is supported on the upper deck 19. The tip 40b of the soft sail 40 is connected to the structure 37 via a rope 42. However, the tip 40b of the soft sail 40 may be supported anywhere, or it may be connected to the crane post 31 via the rope 42.

[0040] The structure of the soft sail is not limited to the embodiments described above. For example, a soft sail 60 as shown in Figures 5 and 6 may be used. In the example shown in Figures 5 and 6, a cylindrical crane post 31 configured to be non-rotatable is used as the column member 30, and the soft sail 60 is installed so as to enclose the crane post 31. Specifically, the soft sail 60 comprises a windward portion 61, a curved portion 62, and a leeward portion 63. The curved portion 62 is a part that is in surface contact with the outer circumferential surface of the crane post 31 and is curved along the curved shape of the outer circumferential surface. The curved portion 62 constitutes the base end 60a of the soft sail 60. The windward portion 61 is the portion located upwind and extends away from the crane post 31 from the windward end of the curved portion 62. The leeward portion 63 is the portion located downwind and extends away from the crane post 31 from the leeward end of the curved portion 62. The tips of the windward end 61 and the leeward end 63 are joined together to form the tip 60b of the soft sail 60. The soft sail 60 is curved as a whole, with the windward end 61 positioned on the outer circumference and the leeward end 63 positioned on the inner circumference. The soft sail 60 may be constructed by wrapping the crane post 31 with a single sheet member and joining the tips of the windward end 61 and the leeward end 63. However, the soft sail 60 may also be constructed by joining together multiple sheet members. The tip 60b of the soft sail 60 is supported by the side post 34 via ropes 42A and 42B. The manner in which the tip 60b of the soft sail 60 is supported by ropes 42A and 42B is the same as in the example shown in Figure 2.

[0041] Referring to Figure 7, the relationship between the orientation of the soft sail 60 and the wind direction will be explained. As shown in Figure 7, the soft sail 60 has a curved shape such that the windward side 61 on the front is the outer surface and the leeward side 63 on the rear is the inner surface. Wind WD blows onto the soft sail 60 from right to left. At this time, the flow velocity FW1 of the wind on the windward side 61 is large, and the flow velocity FW2 of the wind on the leeward side 63 is small. A pressure difference is created due to the difference in flow velocity between the windward side 61 and the leeward side 63, and a lift force LF is generated diagonally forward to the left. Of this lift force LF, it acts as a thrust force DF with respect to the course (forward). By adjusting the orientation of the soft sail 60 according to the wind direction W, the desired thrust force DF can be obtained.

[0042] The soft sail 60 can change direction by rotating in any direction according to the wind direction, centered around the cylindrical crane post 31. At this time, because the soft sail 60 uses a non-rotatable crane post 31, it can change direction while ensuring safety without rotating the boom section 33a.

[0043] In the embodiments and modifications described above, one set of crane post 31 and soft sail 60 was provided on the vessel 1. Alternatively, as shown in Figure 8, the vessel 1 may be provided with multiple sets of crane post 31 and soft sail 60. In addition, multiple soft sails 40, as shown in Figure 2, may be provided instead of the soft sail 60.

[0044] In the examples shown in Figures 5 to 7, nothing was provided in the internal space of the soft sail 60. Instead, as shown in Figure 9, ribs 65 may be placed between the windward side 61 and the leeward side 63 of the soft sail 60 to maintain the shape of the soft sail 60. The windward edge 65a of the rib 65 has a shape corresponding to the inner surface of the windward side 61 and supports the inner surface of the windward side 61. The leeward edge 65b of the rib 65 has a shape corresponding to the inner surface of the leeward side 63 and supports the inner surface of the leeward side 63. Three tiers of ribs 65 are provided inside the soft sail 60. Each rib 65 is arranged so as to be spaced apart from each other in the vertical direction on the crane post 31 side. The tips of each rib 65 are arranged so as to converge at the tip 60b. However, the number of ribs 65 is not particularly limited; there may be one tier, two tiers, or four or more tiers. Thus, the ribs 65 can maintain the shape of the windward side 61 and the leeward side 63 of the soft sail 60 while suppressing costs.

[0045] The configuration shown in Figures 10 to 11 may be adopted. As shown in Figures 10 to 11, the vessel 1 may be equipped with a mainsail 80 and a jib sail 70 on the opposite side of the column member 30. The mainsail 80 corresponds to the soft sail 60 described above. The base end 70a of the jib sail 70 is supported on the side of the crane post 31, and the tip 70b of the jib sail is connected to the upper deck 19 via a rope 46. As shown in Figure 12, the rope 46 extends diagonally downward from the crane post 31. The jib sail 70 is attached to this rope 46.

[0046] Referring to Figure 13, the relationship between the orientation of the mainsail 80 and jib sail 70 and the wind direction will be explained. As shown in Figure 13, the mainsail 80 has a curved shape such that the front windward side 61 is the outer surface and the rear leeward side 63 is the inner surface. The jib sail 70 has a curved shape such that the front windward side 70c is the outer surface and the rear leeward side 70d is the inner surface. Wind WD is blown onto the jib sail 70 from right to left. At this time, the wind velocity FW3 on the windward side 70c increases, and the wind velocity FW4 on the leeward side 70d decreases. As a result, the direction of the wind flowing to the mainsail 80 is changed and accelerated by the jib sail 70. Wind WD, accelerated by the jib sail 70, is blown onto the mainsail 80 from right to left. At this time, the wind velocity FW1 on the windward side 61 increases, and the wind velocity FW2 on the leeward side 63 decreases. A pressure difference is created due to the difference in flow velocity between the windward side 61 and the leeward side 63, generating a lift force LF diagonally forward to the left. Of this lift force LF, it acts as thrust DF in the direction of the course (forward). By adjusting the orientation of the mainsail 80 and jib sail 70 according to the wind direction W, the desired thrust DF can be obtained.

[0047] As described above, the jib sail 70 can adjust the direction of the wind flowing to the main sail 80 and accelerate it. Therefore, the pressure difference between the windward side 61 and the leeward side 63 of the main sail 80 can be increased, and greater lift can be obtained.

[0048] While crane posts and side posts were given as examples of existing column members for mounting soft sails, the system is not limited to these; hatch covers and their running rail sections may also be used. [Explanation of symbols]

[0049] 1...ship, 30...pillar member, 31...crane post, 34...side post, 40, 60...soft sail, 61...windward side, 63...leeward side, 65...rib, 70...jib sail, 80...mainsail, 100...sail structure.

Claims

1. A vessel equipped with soft sails mounted using existing column members located on the upper deck.

2. As the column member, a cylindrical crane post configured to be non-rotatable is used. The vessel according to claim 1, wherein the soft sail is installed so as to enclose the crane post.

3. As the column members, a crane post, which serves as the center post, and side posts are used. The vessel according to claim 1, wherein the soft sail is supported at its base end by the crane post and its tip end is connected to the side post via a rope.

4. The vessel according to claim 1, wherein the soft sail is positioned away from structures that interfere with the airflow to a position where it is not affected by wind interference.

5. The vessel according to claim 2, wherein ribs are arranged between the windward and leeward sides of the soft sail to maintain the shape of the soft sail.

6. The vessel according to claim 1, wherein the soft sail comprises a mainsail and a jib sail on the opposite side of the column member.

7. A sail structure in which a soft sail is installed using existing column members located on the upper deck of a ship.

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