JP2015085930A - On-water travel body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an on-water travel body capable of suppressing wave impact during voyage received on a front end side of a bottom part.SOLUTION: A ship 1 has a tunnel structure part 2 on a ship bottom. The tunnel structure part 2 is formed by making a central part of the ship bottom in a width direction hollow into a semicircle reverse concave shape. On both side parts of the ship bottom in the width direction positioned on both sides of the tunnel structure part 2, mountain parts projecting downward of the ship body are respectively provided. The tunnel structure part 2 is formed into a reverse concave shape extending from a bow 11 toward a stern 12 with same width having a semicircle cross section shape. The bow 11 has a funnel shaped part 3 formed by a recess part extending from the tunnel structure part 2 toward upward and forward. The funnel shaped part 3 is formed by making a central part of the bow 11 in the width direction hollow, and the funnel shaped part 3 is extending from the tunnel structure part 2 toward upward and forward in a state that it is expanded like a funnel-shape in upward and forward direction.

Description

  The present invention relates to a water traveling body.

  As shown in Patent Document 1 below, some water-borne traveling bodies provide mountains and valleys at the bottom of the ship, take air into the valleys, and relieve the resistance of the ship to shocks and waves. In the trimaran of Patent Document 1, a “U” -shaped recess closed by a front step difference and left and right surrounding walls is formed on the bottom of the ship. Between the side hull and the center hull, a transom valley is provided so as to be the height of the running water line when the hull slides. Strips protrude from the left and right surfaces of the center hull at the bottom of the ship. The distance between the strips is gradually opened so that the stern end transom has a position more than twice the propeller diameter.

Japanese Patent Laid-Open No. 9-207871

  However, in the above conventional water-borne body, there is a problem that the height of the mountain portion of the bottom of the ship is lowered toward the bow side, and it is easy to receive the wave impact at the time of navigation at the bottom of the ship.

  The present invention has been made in view of such a problem, and an object thereof is to provide a floating body capable of solving the above-described problems.

In order to achieve such an object, the floating body of the present invention is characterized in that a bottom is provided with a tunnel structure portion formed in a reverse concave cross-sectional shape having the same width from the front end portion to the rear end portion.
Further, the present invention is characterized in that the tunnel structure portion is formed in an arc shape, an oval shape, a straight line, a square shape, or a combination thereof in a reverse concave shape.
Further, the present invention is characterized in that a plurality of the tunnel structure portions are arranged in the width direction of the bottom portion.
Further, the present invention is characterized in that the tunnel structure portion is provided at a position having a different height according to the navigation speed.
Further, the present invention is characterized in that a concave portion extending toward the front upper side from the tunnel structure portion is formed at the front end portion.
Further, according to the present invention, an all-swivel type propulsion device is installed in the tunnel structure portion, and notches are provided in the mountain portions on both sides of the tunnel structure portion at the place where the propulsion device is installed. It is characterized by.
Further, the present invention is characterized in that an inclined portion extending downward and rearward is formed at a rear end portion of the tunnel structure portion.
Further, the present invention is characterized in that a stabilizer is provided behind the rear end portion.
Further, the present invention is characterized in that a trim tab is provided behind the rear end portion.
Further, the present invention is characterized in that at least the rear side of the tunnel structure portion slightly before the screw installation location is wider than the front side slightly before the screw installation location.
Further, the present invention is characterized in that at least a rear side of the tunnel structure portion at a position slightly before a screw installation location is widened without being continuous with a front side from a little before the screw installation location.
In the present invention, the bottom is a wing of a hydrofoil ship.
Moreover, the present invention is characterized in that an elevator is provided on an outer surface inside the wing.
Moreover, the present invention is characterized in that the elevator is provided on the front and rear wings.
Further, the present invention is characterized in that the tunnel structure portion is configured by combining a first concave portion formed inside the hull and a second concave portion formed outside the hull.
Further, the present invention is characterized in that plate-like portions extend downward from both sides of the tunnel structure portion.
Further, according to the present invention, the tunnel structure portion is formed in a cross-sectional shape in which both side portions are inclined upward linearly from the outside to the inside, and the arc-shaped portion extends upward from the inner end portion. It is characterized by that.
Further, according to the present invention, the tunnel structure portion is formed in a cross-sectional shape in which both side portions are inclined upward in an arc shape from the outside to the inside, and the arc shape portion extends upward from the inner end portion. It is characterized by that.
Further, the present invention is characterized in that an underwater brake that moves up and down in the tunnel structure portion is provided at a rear portion of the tunnel structure portion.

  According to the present invention, since the tunnel structure portion provided at the bottom portion is formed in a reverse concave cross-sectional shape having the same width from the front end portion to the rear end portion, it suppresses the wave impact during navigation received on the front end side of the bottom portion. be able to.

It is a figure which shows the ship of the 1st Embodiment of this invention. It is a longitudinal section from the bow of a ship to the stern. It is a cross-sectional view from the bow of the ship to the stern. It is a figure which shows the positional relationship of the waterline at the time of anchoring of a ship, and a hull. It is a figure which shows the positional relationship of the waterline and ship body at the time of the back leaning attitude | position of a ship. It is a figure which shows the water pressure in a tunnel structure part. It is a figure which shows the state which the hull of the ship raised. It is a figure which shows the state in which the clearance gap was made between the tunnel structure part and the water line. It is a figure which shows the tunnel structure part in the 2nd Embodiment of this invention. It is a figure which shows the tunnel structure part in the 3rd Embodiment of this invention. It is a figure which shows the tunnel structure part in the 4th Embodiment of this invention. It is a 1st figure which shows the modification of a tunnel structure part. It is a 2nd figure which shows the modification of a tunnel structure part. It is a front view which shows the hydrofoil ship to which this invention is applied. It is a front view which shows the state which provided the tunnel structure part in the bulging part of the ship bottom. It is a 3rd figure which shows the modification of a tunnel structure part. It is a 4th figure which shows the modification of a tunnel structure part. It is a 5th figure which shows the modification of a tunnel structure part. It is a figure which shows the notch amount of a notch part. It is a 6th figure which shows the modification of a tunnel structure part. It is a 7th figure which shows the modification of a tunnel structure part. It is an 8th figure which shows the modification of a tunnel structure part. It is a 9th figure which shows the modification of a tunnel structure part. It is a 10th figure which shows the modification of a tunnel structure part. It is a front view which shows the modification of the hydrofoil ship to which this invention is applied. It is an 11th figure which shows the modification of a tunnel structure part. It is a 12th figure which shows the modification of a tunnel structure part. It is a 13th figure which shows the modification of a tunnel structure part. It is a 14th figure which shows the modification of a tunnel structure part.

  Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a view showing a ship 1 according to this embodiment, in which (a) is a plan view, (b) is a side view, (c) is a front view, and (d) is a rear view. FIG. 2: has shown the longitudinal cross-sectional view from the bow 11 (front end part) of the ship 1 to the stern 12 (rear end part), (a) is an AA arrow cross-sectional view, (b) is B-. It is B arrow cross-sectional view. In FIG. 2, a space is originally provided inside the hull, and devices and the like are installed in the space, but this space is also hatched.

  A ship 1 shown in FIG. 1 is a hydroplane monohull, and is provided with a tunnel structure 2 at the bottom (bottom) thereof. As shown in FIGS. 1 and 2, the tunnel structure 2 is formed in a reverse concave cross-sectional shape having the same width from the bow 11 to the stern 12.

  FIG. 3 shows a cross-sectional view from the bow 11 to the stern 12 of the ship 1, (a) is a cross-sectional view taken along the arrow D-D, (b) is a cross-sectional view taken along the line EE, and (c) ) Is a cross-sectional view taken along the line FF.

  As shown in FIG. 3A, in the bow 11, the center portion in the width direction of the ship bottom is recessed in a semicircular reverse concave shape to form the tunnel structure portion 2. For this reason, on both side portions in the width direction of the ship bottom located on both sides of the tunnel structure portion 2, peak portions 21 projecting downward from the hull are formed.

  As shown in FIG. 3 (b), the tunnel structure portion 2 is formed even in the portion between the bow 11 and the stern 12, with the center portion in the width direction of the ship bottom recessed into a semicircular reverse concave shape. Mountain portions 21 are formed on both sides. As shown in FIG. 3 (c), even in the stern 12 portion, the center portion in the width direction of the ship bottom is recessed in a semicircular reverse concave shape to form the tunnel structure portion 2, and the mountain portions 21 are formed on both sides of the tunnel structure portion 2. Is formed.

  In the portion of the bow 11 shown in FIG. 3A, the portion between the bow 11 and the stern 12 shown in FIG. 3B, and the portion of the stern 12 shown in FIG. Although it is formed in the same manner as a monohull ship, since the concave portion forming the tunnel structure portion 2 is formed in a semicircular cross-sectional shape having the same width, the concave portion forming the tunnel structure portion 2 is a reverse concave shape having the same width. It has a cross-sectional shape. As described above, the tunnel structure 2 is formed in a reverse concave shape having a reverse concave cross-sectional shape having the same width from the bow 11 to the stern 12.

  As shown in FIGS. 1 and 2, a funnel-shaped portion 3 is formed on the bow 11 by a concave portion extending from the tunnel structure portion 2 toward the front upper side. The funnel-shaped part 3 is formed with a depressed center part in the width direction of the bow 11, and when viewed in a longitudinal section, the center upper part of the tunnel structure part 2 expands like a top part of the ski, and the front upper part It extends to. As shown in FIG. 4, the funnel-shaped part 3 is formed so as to be positioned at the height of the waterline K of the ship.

  Next, the operation | movement at the time of navigation of the ship 1 provided with such a hull structure is demonstrated.

  When the boat 1 is anchored, the draft line K is located at the height of the funnel-shaped portion 3 from the bow 11 to the stern 12 as shown in FIG. When the boat starts traveling from this state and the speed increases, as shown in FIG. 5, the hull is tilted backward. At this time, as shown in FIG. 6, in the tunnel structure portion 2, the water pressure is concentrated from both side portions and the central portion toward the central upper portion, and lift is generated. As a result, as shown in FIG. 7, the water contact area when the hull rises like a water ski decreases, and the frictional resistance of water decreases.

  Further, as described above, the funnel-shaped portion 3 is positioned on the water line K when the ship 1 starts to travel, the funnel-shaped portion 3 receives water pressure, the bow 11 is lifted upward, and the hull is tilted backward. Work like that. As a result, it is possible to effectively obtain the effect of reducing the frictional resistance of water by reducing the water contact area due to the generation of lift due to the concentration of water pressure toward the center upper portion of the tunnel structure portion 2.

  As shown in FIG. 8, the speed of the ship 1 increases so that the edge of the tunnel structure portion 2 on the bow 11 side is positioned at the height of the waterline K, and between the center upper portion of the tunnel structure portion 2 and the waterline K. When a gap is formed, air flows into the tunnel structure portion 2 as indicated by an arrow in FIG. 8 from this gap. The air that has flowed into the tunnel structure part 2 holds water and air from both sides to the center along the inner peripheral surface of the center upper part of the tunnel structure part 2, and agitates and agitates the bubble layer. Forming and reducing the frictional resistance experienced by the hull. This effect increases as the hull speed increases, and makes the hull hydroplane. Moreover, the effect of an air cushion is also acquired by air bubbles.

  Moreover, when the speed of the ship 1 increases until the draft line K reaches the height of the tunnel structure part 2 by providing the tunnel structure part 2 at the bottom of the ship, the hull of the ship 1 generates water by pushing the water left and right. Waves can flow into the tunnel structure 2, and the wave-making resistance generated when the ship 1 creates waves and sails is reduced. Furthermore, the air that has flowed into the tunnel structure part 2 is concentrated by holding water and air from both sides to the center along the tunnel structure part 2 and stirring, bubbles are generated, and the viscous pressure resistance of the water is reduced. Decrease.

  As described above, in the ship 1, the fluid resistance can be reduced by providing the tunnel structure portion 2 at the bottom of the ship, so that the speed and fuel consumption can be improved.

  According to the present embodiment, since the tunnel structure 2 provided on the bottom of the ship is formed in a reverse concave cross-sectional shape having the same width from the bow 11 to the stern 12, the front projection area is small and the tunnel structure Since the tip of 2 has a shape and thickness that can be easily waved, the resistance is reduced. For this reason, the wave impact received by the bow 11 side of a ship bottom part at the time of navigation can be suppressed. Moreover, the intensity | strength of the hull 1 can be raised because a ship bottom part is formed in cross-sectional shape of a reverse concave shape.

  In the above embodiment, the case where the tunnel structure portion 2 is provided at the center in the width direction of the ship bottom has been described. However, as in the second embodiment shown in FIG. 9, the tunnel structure portions 4a and 4b are connected to the ship bottom. It is good also as a structure provided with arranging two or more in the width direction.

  In this embodiment, two tunnel structure parts 4a and 4b are provided side by side in the width direction of the ship bottom. These tunnel structures 4a and 4b are each formed in a reverse concave cross-sectional shape having the same width from the bow 11 to the stern 12 as in the tunnel structure 2 of the first embodiment. Further, the bow 11 is provided with funnel-like portions 5a and 5b extending from the respective tunnel structure portions 4a and 4b toward the front upper side, along with the width direction of the hull. In this configuration, by attaching a sonar or the like to the mountain portion between the tunnel structure portions 4a and 4b, the resistance of water received by the sonar can be reduced, and the balance between the left and right is not lost.

  In the second embodiment, the case where the tunnel structure portions 4a and 4b arranged in the width direction of the ship bottom are formed at the same height has been described. However, as in the third embodiment shown in FIG. 10 and the fourth embodiment shown in FIG. 11, the tunnel structures arranged in the width direction of the ship bottom have different heights corresponding to the navigation speed of the ship 1. It may be done.

  The floating body of the third embodiment shown in FIG. 10 is a monohull with a tunnel structure. The floating body includes a tunnel structure 6a provided at the center in the width direction of the ship bottom and a tunnel structure 6b provided on both sides in the width direction of the ship bottom. Tunnel structure portions 6b provided on both sides in the width direction of the ship bottom are formed at positions lower than tunnel structure portions 6a provided in the center portion in the width direction of the ship bottom. In addition, funnel-shaped portions 7a and 7b extend from the tunnel structure portions 6a and 6b toward the front upper side on the bow 11. Thereby, it is possible to prevent the water pressure from escaping to the left and right at medium and low speeds, and the stability of the hull 1 can be improved. The tunnel structure 6b may be formed at a position higher than the tunnel structure 6a.

  The floating traveling body of the present embodiment includes a funnel-shaped portion 7a extending from the tunnel structure portion 6a at the center in the width direction of the ship bottom, and a funnel-shaped portion 7b extending from the tunnel structure portions 6b on both sides in the width direction of the ship bottom. It is designed to be used at low to medium speeds. A funnel-shaped portion 7b extending from the tunnel structure portion 6b at the center in the width direction of the ship bottom is formed so as to be used at a medium speed to a high speed of the ship 1 or used at a high speed.

  Thus, by forming the tunnel structure portions 6b provided on both sides in the width direction of the ship bottom at positions lower than the tunnel structure portion 6a provided in the center portion in the width direction of the ship bottom, the low speed to medium speed of the ship Sometimes the funnel-shaped portion 7a extending from the tunnel structure portion 6a at the center in the width direction of the ship bottom works together with the funnel-shaped portion 7b extending from the tunnel structure portions 6b on both sides in the width direction of the ship bottom. Further, at the time of medium speed to high speed of the ship or at high speed, the funnel-shaped part 7b extending from the tunnel structure part 6b on both sides in the width direction of the ship bottom acts.

  In the third embodiment, the case where the surface traveling body provided with a plurality of tunnel structures 2 arranged in the width direction of the ship bottom is applied to a monohull, but the surface traveling according to the fourth embodiment shown in FIG. The body is applied to a catamaran with a floating body provided with a plurality of tunnel structures 8a, 8b arranged in the width direction of the ship bottom.

  The surface traveling body of the fourth embodiment includes a tunnel structure portion 8a provided at the center in the width direction of the ship bottom and a tunnel structure portion 8b provided on both sides in the width direction of the ship bottom. The tunnel structure 8a provided at the center in the width direction of the ship bottom is formed at a position higher than the tunnel structure 8b provided on both sides in the width direction of the ship bottom.

  The floating body of the present embodiment includes a funnel-shaped portion 9a extending from the tunnel structure portion 8a at the center in the width direction of the ship bottom, and a funnel-shaped portion 9b extending from the tunnel structure portions 8b on both sides in the width direction of the ship bottom. It is formed to be used when the ship 1 is at low speed to medium speed. Moreover, the funnel-shaped part 9b extended from the tunnel structure part 8b of the both sides of the width direction of a ship bottom is formed so that it may be used at the time of medium speed-high speed of the ship 1, or may be used at high speed.

  Thus, by forming the tunnel structure portion 8a provided in the center portion in the width direction of the ship bottom at a position higher than the tunnel structure portions 8b provided on both sides in the width direction of the vessel bottom, At a speed, the funnel-shaped portion 9a extending from the tunnel structure portion 8a at the center in the width direction of the ship bottom acts together with the funnel-shaped portion 9b extending from the tunnel structure portions 8b on both sides in the width direction of the ship bottom. Further, when the ship is at a medium speed to a high speed, or at a high speed, funnel-shaped portions 9b extending from the tunnel structure portions 8b on both sides in the width direction of the ship bottom act. The surface traveling body of the present invention can be applied not only to monohulls and catamarans but also to other multihull ships and other surface traveling bodies such as jet skis and jet wheels.

  In each of the above embodiments, the case has been described in which the tunnel structures 2, 4a, 4a, 6a, 6b, 8a, 8b are formed in a reverse concave shape having a semicircular cross-sectional shape. However, if the tunnel structure part 2 is formed in the same reverse concave cross-sectional shape from the bow 11 to the stern 12, the cross-sectional shape is arbitrary. For example, like the tunnel structure part 11a shown to Fig.12 (a), you may form in the reverse concave shape which has an elliptical cross-sectional shape.

Moreover, like the tunnel structure part 11b shown in FIG.12 (b), you may form in the reverse concave shape which has the cross-sectional shape which combined the arc and the straight line. Moreover, like the tunnel structure part 11c shown in FIG.12 (c), you may form in the reverse concave shape which has the polygonal cross-sectional shape with which the straight line was combined.

  Moreover, you may form in the reverse concave shape of the cross-sectional shape which combined the semicircle shape and the arc shape. Moreover, you may form in the reverse concave shape of the cross-sectional shape which combined the semicircle shape and the ellipse, and the cross-sectional shape which combined the semicircle shape and the polygonal shape. Further, a semicircular shape, an arc shape, an oval shape, a straight line, and a square shape may be combined to form a reverse concave shape.

  Moreover, you may form in the reverse concave shape of the cross-sectional shape which combined the arc shape and the ellipse. Moreover, you may form in the reverse concave shape of the cross-sectional shape which combined the arc shape and the polygonal shape. Moreover, you may form in the reverse concave shape of the cross-sectional shape which combined the polygon and the ellipse.

  Moreover, it is good also as a structure which makes the plate-shaped part 22 extend below from the ship bottom from the lower end part of the both sides of the tunnel structure part 2 like the tunnel structure part 11i shown in FIG. According to this structure, it can suppress that water flows out from the tunnel structure part 11i right and left, a pressure increases, and the lift of a ship body can be improved.

  Moreover, although the said embodiment demonstrated the case where the tunnel structure part 2 was provided in the ship bottom which is the bottom part of the ship 1, the position which provides the tunnel structure part 2 will be arbitrary if it is a bottom part of a surface traveling body. For example, when the surface traveling body is a hydrofoil ship, as shown in FIG. 14, the tunnel structure part 14 may be provided on the wing 13 provided on the ship bottom. In addition, the wing 13 may be attached to a leg portion extending in a C shape from the ship bottom. Moreover, the formation position of the funnel-shaped part 3 is not necessarily formed so as to be positioned at the height of the waterline K of the ship 1.

  Further, in the first embodiment, the case where the tunnel structure portion 2 is formed by forming the ship bottom in a reverse concave shape has been described. However, as shown in FIG. 15, the bulging portion 15 extending from the ship bottom to below the hull. Alternatively, the tunnel structure 2 may be provided. According to this configuration, since the bulging portion 15 is formed to have the same width from the bow to the stern, the ship 1 does not reach the height of the tunnel structure portion 2 but the height of the bulging portion 15. If the speed is increased, the wave resistance generated on both sides of the bottom of the tunnel structure can be reduced.

  Moreover, although the said embodiment demonstrated the case where the funnel-shaped part 3 was formed in the bow as a recessed part extended toward the front upper direction from the tunnel structure part 2, the shape of the recessed part of this invention is arbitrary, for example, It may be formed in the shape of a baseball hat. When a plurality of tunnel structure portions are provided side by side, the interval between the tunnel structure portions is arbitrary and can be provided in accordance with the position of the propulsion device. Also, the shape of the upper part of the tunnel structure does not have to be the same shape from the front end to the rear end of the surface traveling body, and a propulsion device mounting base is provided, or only the rear end of the surface traveling body is flat. It may be formed. In this case, it is preferable that the mounting table is gently inclined forward and backward so that the influence of the water flow is suppressed.

  Moreover, the tunnel structure part should just be formed in the reverse concave cross-sectional shape of the same width | variety from the front-end part of a water-borne traveling body to a rear-end part. For example, as shown in FIG. 16, the tunnel structure portion 2 at the stern portion may include an inclined portion 23 that extends rearward and downward. The inclined portion 23 is bent downward at the upper portion of the tunnel structure portion 2 or lowered downward in a straight line so that the cross-sectional shape of the upper center portion of the tunnel structure portion 2 becomes a shape in which the top portion of the ski is turned upside down. Is formed. A trim tab 24 that rotates up and down as shown by an arrow in FIG. 16 is provided behind the inclined portion 23. In the inclined portion 23, the upper portion of the tunnel structure portion 2 is flat so as to continuously extend from the lower surface of the trim tab 24. By the inclined portion 23 and the trim tab 24, the water flow in the tunnel structure portion 2 is directed downward as indicated by an arrow, buoyancy is exerted at the center upper portion of the tunnel structure portion 2 as indicated by a thick arrow, and the stern 12 sinks. Decrease. In addition, a step may be provided slightly before the trim tab 24 to eliminate a step from the trim tab 24.

  Note that two trim tabs 24 may be provided side by side in the width direction of the tunnel structure portion 2 as shown in FIG. In addition, as shown in FIG. 17B, when the tunnel structure portions 2 are arranged in the width direction of the hull 1, an inclined portion 23 and a trim tab 24 may be provided for each tunnel structure portion 2. .

  In addition, when a propulsion device such as a fully swiveling water jet or a screw is provided at the bottom of the surface of the surface of the surface, the tunnel is installed at the location where the propulsion device is installed so that the propulsion device does not contact the tunnel structure. It is good also as a structure by which the notch part is provided in the peak part of the both sides of a structure part. For example, as shown in FIG. 18 (a), when a fully swivel propulsion device is mounted on the mounting base 26 at the stern portion of the bottom of the ship, the propulsion device that rotates to turn the propulsion direction to the side; In order to avoid contact with each other, the notches 25 may be provided in the mountain portions 21 on both sides of the stern 12 portion of the tunnel structure portion 2. In addition, as shown in FIG. 18B, when the all-turn propulsion device is mounted not only on the stern portion of the bottom of the ship but also on the mounting base 26 provided between the bow and the stern, It can be set as the structure by which the notch part 25 of the peak part 21 of the both sides of the structure part 2 is provided not only in a stern part but between the bow and the stern.

  Note that the notch amount (height and width) of the notch 25 is such that the influence of thrust is suppressed when the propulsion device is used as a thruster, and the outflow of water from the tunnel structure 2 is suppressed during navigation. For example, as shown in FIG. 19, a part of the screw 27 can be formed so as to be visible from the side through the notch 25.

  Further, as shown in FIG. 20, at least the rear side of the tunnel structure portion 2 slightly before the installation location of the screw 27 may be widened compared to the front side slightly before the installation location of the screw 27. According to this configuration, it is possible to install a screw 27 that is larger than the tunnel structure 2. In addition, the widened part is separated from the hull 1 and is exchanged or divided by integral formation, and is divided into two parts on the right and left from the center, three parts on the upper, right and left, etc. By changing the mounting position, the tunnel structure portion 2 having a width corresponding to the size of the screw 27 can be formed.

  Further, as shown in FIG. 21, a trim tab 28 may be provided at the rear end portion of the tunnel structure portion 2. The trim tab 28 is raised and lowered with the bow 11 side as a fulcrum as shown by an arrow in FIG. 22 when the stern 12 side is raised and lowered by a cylinder 29 provided above the tunnel structure portion 2. Thereby, compared with the case where the trim tab 24 is provided in the stern 12, it can suppress that a water flow escapes from both sides and a water pressure reduces.

  Further, like the hydrofoil ship 1 shown in FIG. 23, the tunnel structure portion 16 is formed on the inner side of the hull, and the second concave portion 16a is formed on the outer side of the hull and is larger than the first concave portion 16a. You may be comprised by the recessed part 16b. According to this configuration, when the hull is tilted to the left and right, it is possible to obtain an effect of recovering the hull inclination by obtaining a large buoyancy in the second second recess 16b. It should be noted that whichever of the first recess 16a and the second recess 16b may be higher.

  Moreover, as shown in FIG. 24, the tunnel structure part 17 may be formed in the shape which combined the recessed part 17a and the recessed part 17b.

  Moreover, when the surface traveling body is a hydrofoil ship as shown in FIG. 14, as shown in FIG. 25, the wing 13 provided with the tunnel structure part 14 may be provided with an elevator 13a. In this example, the elevator 13 a extends from the inner side surface of the wing 13 toward the side. In this configuration, it is possible to control the attitude of the hull of the ship 1 by raising and lowering the elevator 13a. In addition, in this figure, the structure in which the funnel-shaped part 3 is not provided is shown. Thus, the funnel-shaped part 3 does not necessarily need to be provided.

  Further, in the hydrofoil ship in which the tunnel structure portion 16 is configured by the first concave portion 16a and the second concave portion 16b larger than the first concave portion 16a, the first concave portion 16a is formed on the first concave portion 16a inside the hull. The elevator 13a can be formed.

  Further, in the example shown in FIG. 20, the side wall of the tunnel structure portion 2 is widened so that the rear side of at least the installation location of the screw 27 of the tunnel structure portion 2 is wider than the front side of the installation location of the screw 27. The structure gradually spreads outward. However, as shown in FIG. 26, the side wall on the front side of the tunnel structure portion 2 at least slightly before the installation site of the screw 27 and the side wall on the rear side of the installation site of the screw 27 are not continuous. It is good also as a structure by which the opening part 27a was provided between the front side of the structure part 2 a little before the installation location of the screw 27 and the rear side a little before the installation location of the screw 27.

  In this configuration, as shown in FIG. 26, water enters the tunnel structure 2 from the opening 27a and flows in the tunnel structure 2 from the front side at least slightly before the installation location of the screw 27 of the tunnel structure 2. It merges with the water that has flown and flows toward the rear of the tunnel structure 2. According to this configuration, as in the configuration shown in FIG. 20, compared to the case where the width of the tunnel structure portion 2 is different between the front side and the rear side slightly before the installation location of the screw 27, Can reduce the resistance and smooth the flow. Further, resistance due to the widened portion can be suppressed.

  Moreover, the cross-sectional shape of the tunnel structure portion 2 is not limited to that in the above-described embodiment. For example, as shown in the tunnel structure portion 19 shown in FIG. It is good also as a structure which inclines upward linearly toward inner side and the circular arc-shaped part 19b extends upward from the inner edge part of the both-sides part 19a. Further, as in the tunnel structure portion 20 shown in FIG. 27 (b), both side portions 20a of the tunnel structure portion 20 are inclined upward in an arc shape from the outside to the inside, and the arc-shaped portion 20b from the inner end portion of the both side portions 20a. May be configured to extend upward. According to these configurations, the spray bubbles are generated inside the tunnel structure portion 20 at both side portions 19a and 20a, and the resistance can be reduced.

  In addition, as shown in FIG. 28, an underwater brake 30 a that moves up and down in the tunnel structure 30 may be provided at the rear of the tunnel structure 30. The submersible brake 30a is configured to move up and down in the tunnel structure 30 by a cylinder 30b. As shown in FIG. 29, the submersible brake 30a is lowered at the front end side by the cylinder 30b, closes the tunnel structure 30 and applies the brake.

1 Ship 2 Tunnel Structure 21 Mountain Part 22 Plate Part 23 Inclined Part 24 Trim Tab (Stabilizer)
25 Notch 26 Mounting base 27 Screw 28 Trim tab (stabilizing plate)
29 Cylinder 3 Funnel-like part 4a, 4b Tunnel structure part 5a, 5b Funnel-like part 6a, 6b Tunnel structure part 7a, 7b Funnel-like part 8a, 8b Tunnel structure part 9a, 9b Funnel-like part 11a-11c, 11i Tunnel structure part 11 bow 12 stern 13 wing 13a elevator 14 tunnel structure 15 bulge 16 tunnel structure 16a first recess 16b second recess 17 tunnel structure 17a recess 17b recess 18a funnel 18b funnel-shaped portions 19a, 20a Both side portions 19b, 20b Arc-shaped portions 19, 20, 30 Tunnel structure portion 27a Opening portion 30a Underwater brake 30b Cylinder

Claims (19)

  A water-borne traveling body comprising a tunnel structure portion formed in a reverse concave cross-sectional shape having the same width from a front end portion to a rear end portion at a bottom portion.   2. The water-borne traveling body according to claim 1, wherein the tunnel structure is formed in an arc shape, an oval shape, a straight line, a square shape, or a combination of these in a reverse concave shape.   The water-borne traveling body according to claim 1, wherein a plurality of the tunnel structure portions are arranged in the width direction of the bottom portion.   The surface traveling body according to claim 3, wherein the tunnel structure portion is provided at a position having a different height according to a navigation speed.   The water traveling body according to any one of claims 1 to 4, wherein a concave portion extending from the tunnel structure portion toward the front upper side is formed at the front end portion. In the tunnel structure part, a fully swivel type propulsion device is installed,
The water-borne traveling body according to any one of claims 1 to 5, wherein a notch portion is provided in a mountain portion on both sides of the tunnel structure portion at an installation location of the propulsion device.   The water traveling body according to any one of claims 1 to 6, wherein an inclined portion extending downward and rearward is formed at a rear end portion of the tunnel structure portion.   The water traveling body according to claim 1, wherein a stabilizer is provided behind the rear end portion.   The water traveling body according to any one of claims 1 to 8, wherein a trim tab is provided at a rear end portion of the tunnel structure portion.   The water surface according to any one of claims 1 to 9, wherein at least a rear side of the tunnel structure portion at a position slightly before a screw installation location is wider than a front side at a time slightly before the screw installation location. Traveling body.   11. The water-borne traveling body according to claim 10, wherein at least a rear side of at least a screw installation location of the tunnel structure portion is widened without being continuous with a front side of the front of the screw installation location.   The surface traveling body according to any one of claims 1 to 11, wherein the bottom portion is a wing of a hydrofoil ship.   The water-borne traveling body according to any one of claims 1 to 12, wherein an elevator is provided on an outer surface inside the wing.   The water traveling body according to claim 13, wherein the elevator is provided on the front and rear wings.   15. The water surface according to claim 14, wherein the tunnel structure portion is configured by combining a first concave portion formed inside the hull and a second concave portion formed outside the hull. Traveling body.   The water-borne traveling body according to any one of claims 1 to 15, wherein a plate-like portion extends downward from both sides of the tunnel structure portion.   The tunnel structure portion is formed in a cross-sectional shape in which both side portions are inclined upward in a straight line from the outside to the inside, and an arc-shaped portion extends upward from an end portion on the inside. Item 15. The water-borne traveling body according to items 1 to 16.   The tunnel structure portion is formed in a cross-sectional shape in which both side portions are inclined upward in an arc shape from the outside to the inside, and the arc shape portion extends upward from an inner end portion thereof. Item 15. The water-borne traveling body according to items 1 to 16.   The underwater brake according to any one of claims 1 to 18, wherein an underwater brake that moves up and down in the tunnel structure portion is provided at a rear portion of the tunnel structure portion.

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