JPH0667292U - Hydrofoil - Google Patents

Abstract

(57) [Abstract] [Purpose] To reduce the resistance of a hydrofoil when the water is removed from the hull. [Structure] Rear struts 7 and 8 extend downward from the left and right side surfaces of a vessel 6 at the rear part of a hull 2 of a hydrofoil 1, and rear hydrofoils 11 and 12 are attached to the lower ends of the rear struts, respectively. In the stopped state, the joints 7A and 8A of the rear strut with the hull are located above the water-saving line Ls when stopped. As a result, when water is removed from the hull, there is no transient state in which the joints 7A and 8A of the rear struts that stop the flow of water cross the water surface and pass through the water surface. The increase in resistance is suppressed and the required thrust is small. For this reason, the transition from the boat-running state to the wing-running state is performed quickly, and efficient high-speed navigation is possible with a small engine.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to the structure of a hydrofoil ship having hydrofoils on struts extending from the hull to the water.

[0002]

[Prior art]

 Equipped with hydrofoils that are located in the water and connected to the hull by struts, the lift of the hydrofoils imparts buoyancy to the hull when the boat is running, thereby reducing the amount of water drained from the hull to obtain a wing running state and resistance. There are many proposals for hydrofoil vessels that reduce the cruising speed to improve the navigation speed. This type of conventional hydrofoil has a structure as shown in FIG. (A) of the figure is a side view showing a stopped state, and (b) is a cross-sectional view of an EE portion in (a).

That is, a front strut 34 is provided on a keel 33 of the hull 32 of the hydrofoil 30 so as to extend downward, and a front hydrofoil 35 is provided at a lower end of the front strut 34. It is installed. Further, rear struts 37, 38 extend downward from the left and right side surfaces of the vessel 36 at the rear of the hull 32, and rear hydrofoils 41, 42 are attached to the lower ends of the rear struts, respectively. In particular, when the hydrofoil is not navigating, as shown in Fig. 6, the joints 37A and 38A of the rear strut with the hull are located in the water below the dive line Ls when the ship is stopped, and the front strut is also in contact. The joint portion 34A with the hull is also located underwater.

When the hydrofoil starts to run, the hull 32 is lifted by the buoyancy of the hydrofoils 35, 41, 42 at the lower ends of the front struts and the rear struts in the water to separate the water, and the wing running state. Will sail at. This reduces the amount of water drained from the hull and reduces the resistance during navigation.

[0005]

[Problems to be solved by the device]

By the way, in the conventional hydrofoil as described above, since the joint of the rear strut and the hull is located in the water below the dive line when the ship is stopped, the situation shown in Fig. Then, when the hull 32 takes off water and enters the wing running state, the joints 37A, 38A of the rear struts 37, 38 with the hull appear across the water surface and appear on the water surface. (A) of a figure is a side view, (b) is a FF section cross section figure in (a). At this time, at the joints 37A and 38A of the rear struts 37 and 38 extending downward from the side surface of the vessel 36 that is inclined in the cross section, the relative flow of water is dammed on the water surface, which causes The resistance weighting phenomenon due to spray generation is large. The rear strut has a remarkable increase in resistance due to the fact that there are as many as two.

When the resistance at the time of water separation increases in this way, it is difficult for the ship speed to rise, and especially during stormy weather, the resistance due to waves adds to these, making it difficult to transition to the wing running state. . And as a result of the above, if the resistance at the time of water separation is greater than the resistance at the wing running, the required thrust of the hydrofoil will depend on the resistance at the time of water separation. There is a problem that the maximum thrust of the main engine of a hydrofoil is unnecessarily large. Therefore, in view of the conventional problems described above, an object of the present invention is to provide a hydrofoil ship configured so that the resistance at the time of water separation is reduced.

[0007]

[Means for Solving the Problems]

 For this reason, the present invention is a hydrofoil ship that is provided with a submerged wing provided through a strut extending from the hull to the water, and obtains a wing running state by the lift of the hydrofoil. It is assumed that the section is located above the ditch line when the ship is stopped.

[0008]

[Action]

 Since the joint between the strut and the hull is already above the water line when the boat is stopped when the boat is stopped, it is possible that the joint that blocks the flow of water may pass across the water surface even when the boat is taking off water. Absent. Therefore, the increase in resistance due to the wave-making phenomenon and the generation of spray is suppressed, and the required thrust at the time of water separation is small.

[0009]

【Example】

 FIG. 1 shows a first embodiment of the present invention. (A) of a figure is a side view which shows a ship stop state, (b) is a transverse cross-sectional view of the AA part in (a). As in the case of FIG. 6, a front strut 4 is provided on the keel 3 of the hull 2 of the hydrofoil 1 so as to extend downward, and a front hydrofoil 5 is provided at the lower end of the front strut 4. Is attached. Further, rear struts 7 and 8 extend downward from the left and right side surfaces of the hull 6 at the rear of the hull 2, and rear hydrofoils 11 and 12 are attached to the lower ends of the rear struts, respectively.

Here, in this embodiment, the joints 7A and 8A at the upper ends of the rear struts 7 and 8 with the hull 2 are in a stopped state where the hydrofoil 1 is not in operation, and are more Located at the upper side, the rear struts 7 and 8 extend from their joints 7A and 8A in the direction in which their lower ends are narrowed to each other. On the other hand, the joint portion 4A of the front strut 4 with the hull 2 is located underwater.

In the hydrofoil 1 of the embodiment thus configured, when the boat starts to run, the hydrofoils 5, 11, 12 at the lower ends of the front struts 4 and the rear struts 7, 8 are underwater as shown in FIG. The hull 2 will be lifted by the buoyancy of the ship and will take off the water, and will sail in a wing-running state. As a result, the amount of drainage of the hull 2 is reduced, and the resistance when trying to navigate at high speed is reduced. In addition, (a) of a figure is a side view and (b) is a BB section horizontal cross-sectional view in (a).

In particular, in the stopped state, the joints 7A and 8A of the rear struts 7 and 8 with the hull 2 are already located above the water line Ls when the ship is stopped, so that the hull shown in FIG. Even at the time of water separation, since there is no transient state in which the joints 7A, 8A with the hull of the rear strut that cross the water flow and cross the water surface and pass through the water surface, the rear strut 7, 8 and the water surface No major changes in relationships occur.

As a result, the levels of wave-making resistance and spray resistance generated on the way are lowered, and as shown by the solid line in the graph showing the necessary thrust, that is, the resistance against the ship speed in FIG. Requires less thrust when separating water than thrust. Therefore, water separation proceeds smoothly without any resistance, and the transition from the boat running state to the wing running state is carried out quickly. Moreover, since the resistance at the time of water separation is small, the required thrust of the hydrofoil is small, which has the effect of enabling efficient high-speed navigation with a small engine.

A second embodiment is shown in FIG. (A) of a figure is a side view which shows a ship stop state, (b) is a CC sectional view taken on the line in (a). Here, rear struts 17 and 18 have L-shaped portions 19 and 20 at their upper ends and are connected to the deck side edge gun flannel portion 25 of the hull 2 '. As a result, the rear struts 17 and 18 extend leftward and rightward from the upper edge of the hull 2 ', then extend downward into the water, and hydrofoils 11 and 12 are attached to the lower ends thereof. The rear struts 17 and 18 have their lower ends extending in the direction of narrowing toward the center of the hull 2 ', as shown in FIG. Other configurations including the front strut 4 and the front hydrofoil 5 are the same as in the previous embodiment.

A water separation state of the hydrofoil 1'according to this embodiment is shown in FIG. (A) of a figure is a side view, (b) is a DD sectional view taken on the line in (a). Also in this embodiment, the joints 17A and 18A of the rear struts 17 and 18 with the hull 2'when the ship is stopped are already located above the water line Ls when the ship is stopped. Since the joints 17A and 18A of the rear strut with the hull do not cause a transitional state in which the flow of water is blocked at the water surface, the same effect as in the previous embodiment can be obtained. In addition, in each of the embodiments, the one applied to the rear strut is shown, but not only this, but it can be easily applied to the front strut.

[0016]

[Effect of device]

 As described above, in the present invention, the joint between the strut to which the hydrofoil is attached and the hull is provided above the water line when the ship is stopped.Therefore, the joint between the strut and the hull is in a stopped state. Is already above the waterline when the ship is stopped, and the joint that blocks the flow of water when the hull leaves the water does not pass from underwater across the surface of the water. This has the effect of requiring less thrust. As a result, the transition from the boat-running state to the wing-running state is performed quickly, and the effect is obtained that efficient high-speed navigation is possible with a small engine.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention.

FIG. 2 is a diagram showing a state at the time of water separation in the first embodiment.

FIG. 3 is a diagram showing required thrust with respect to ship speed.

FIG. 4 is a diagram showing a second embodiment.

FIG. 5 is a diagram showing a state at the time of water separation in the second embodiment.

FIG. 6 is a diagram showing a conventional example.

FIG. 7 is a diagram showing a state during water separation in a conventional example.

[Explanation of Codes] 1, 1'hydrofoil 2, 2'hull 3 keel 4 front strut 4A joint 5 front hydrofoil 6 vessel side 7, 8 rear strut 7A, 8A joint 11, 12 rear hydrofoil 17, 18 Rear strut 17A, 18A Joint part 19, 20 L-shaped part 25 Gunnel part 30 Hydrofoil ship 32 Hull 33 Keel 34 Front strut 34A Connection part 35 Front hydrofoil 36 Vent 37, 38 Rear strut 37A, 38B Junction 41, 42 Rear Hydrofoil Ls Stop Docking Line

Claims (3)

[Scope of utility model registration request] 1. A hydrofoil ship having hydrofoils provided via struts extending into the water from a hull, wherein the hydrofoil lifts the wing to obtain a wing-running state, wherein the joint between the struts and the hull is stopped. A hydrofoil characterized by being installed above the Tokidiwa Line. 2. The hydrofoil ship according to claim 1, wherein the joint portions are provided on left and right side surfaces of a hull of the hull, and the struts extend from left and right side surfaces of the hull. 3. The joint portion is provided on a deck side edge of the hull, and the strut has an L-shaped upper end and extends left and right from the deck side edge of the hull, and then extends downward. The hydrofoil ship according to claim 1, wherein