JP2003011881A - Hydrofoil craft - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydrofoil craft capable of sailing while floating most of its hull weight by means of lift produced by a hydrofoil, and maintaining the hull's attitude by means of lift produced by ground effects. SOLUTION: The hull of the hydrofoil craft 10, which is provided with recess parts 20 and 20 on both the right and left sides of the hull's bottom 13, comprises a center hull 30 and side hulls 31 and 31. A propulsion device 15 consisting of an underwater propeller is provided at the stern of the hull and a step 30a is formed at the front side of the center hull 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydrofoil with a hydrofoil and a hydrofoil that uses the lift generated by the ground effect.

[0002]

2. Description of the Related Art Conventionally, in order to reduce the contact area between the ship bottom and water and reduce the resistance force that the ship bottom receives from water, the ship's hull 51, as shown in FIG.
A technique is known in which a hydrofoil 52 is provided on the vehicle, and lift is generated from the hydrofoil 52 to levitate the hull from the surface of the water so that the hull travels. However, it is difficult for the hull that travels at high speed due to the lift generated by the hydrofoil 52 to maintain its attitude. Similarly, a ground effect ship that sails by utilizing lift is easy to maintain its attitude, but the lift generated on the flight wing by the ground effect is smaller than the lift generated by the hydrofoil, so It was necessary to reduce the weight of the hull. Furthermore, since a propulsion unit consisting of an aerial propeller is used, a large amount of noise is generated. Therefore, for example, in the technique disclosed in Japanese Patent Laid-Open No. 5-319358, a front hydrofoil and a rear hydrofoil are provided at front and rear positions of a ship bottom, and flight wings are horizontally projected on both left and right sides of the hull. A hydrofoil ship was set up to run by a water jet propulsion machine.

[0003]

However, Japanese Patent Laid-Open No. 5-3.
In the technology disclosed in Japanese Patent No. 19358, the flight wings are provided on both left and right sides of the hull, so that the flight wings interfere with the ship when it is moored in a harbor or the like and come into contact with other ships. Space was needed to prevent this. Further, since air easily escapes from between the flight wing and the water surface, the ground effect is weak.

[0004]

The problem to be solved by the present invention is as described above, and the means for solving this problem will be described below.

That is, according to claim 1, a hydrofoil vessel having a center hull and a side hull with concave portions provided on both left and right sides of the bottom of the vessel, wherein a propulsion unit consisting of an underwater propeller is provided at the stern. Is.

According to a second aspect of the invention, an aerial propeller is used for the propulsion device.

In the third aspect, the step is formed on the front side of the center hull.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described. 1 is a side view of a ground effect wing ship with hydrofoil of the present invention, FIG. 2 is a front view thereof, FIG. 3 is a bottom view thereof, FIG. 4 is a view showing a relationship between speed and output, and FIG. It is a front view of a wing ship.

As shown in FIGS. 1 to 3, the watercraft 10 with hydrofoil has a riding section 12 arranged on the upper portion thereof.
A ship bottom 13 is disposed below the ship 2. A propulsion unit 15 including an underwater propeller is arranged at the stern of the watercraft 10 with hydrofoils, and a hydrofoil 16 is arranged at the bottom 13 of the ship. The hydrofoil 16 is supported at the tip of the hydrofoil support 17 so that the attack angle can be adjusted. The propulsion device is not limited to the propeller, but may be any propelling device such as a water jet propulsion device. Further, in addition to the propulsion device, a propulsion device including an aerial propeller is provided on the hull, so that higher speed can be achieved.

Further, the hydrofoil-equipped ship 10 is provided with recesses 20 and 20 on both left and right sides of the bottom 13 in a front view and a stern direction so as to have a substantially M-shape in a front view. The center hull 30 and the side hulls 31 and 31 are provided. It is a three-story ship composed of and. The center hull 30 is formed so as to project downward in order to balance the left and right sides of the hull.
The hydrofoil 16 is disposed substantially at the center. And the center hull 30 and the side hull 31.3 in front of the bow
A curved tunnel portion 33 is formed at the front end of the nozzle 1 to allow air to flow into the recesses 20 and 20 formed between the center hull 30 and the side hulls 31 and 31.

By propelling the hydrofoil 16 with the hydrofoil 16 projecting downward, the hydrofoil-equipped ship 10 can generate a lift force on the hydrofoil 16 and also a lift force on the hull by the ground effect. As a result, the ship bottom 13 rises above the sea surface, and the contact area between the ship bottom 13 and the sea surface decreases. Since the hull floats up and the contact area between the water and the bottom 13 of the ship is reduced, the resistance force that the bottom 13 receives from the water is reduced.

With the above structure, it is possible to effectively utilize the propulsion force generated by the propulsion unit 15 arranged at the rear portion of the hull and efficiently increase the propulsion speed. The propulsion machine 15
Is driven to rotate by an engine arranged inside the hull.

The graph of FIG. 4 shows the relationship between the propulsion speed and the output of the engine. In this graph, the horizontal axis represents the output of the engine and the vertical axis represents the propulsion speed. is there. When the hydrofoil-equipped ship 10 of the present invention exceeds a predetermined output, the propulsion speed can be increased and the propulsion speed can be efficiently increased at the same output as compared with the conventional ship.

Furthermore, a part of the stern and the side hull 31.3
Since the water is always contacted with 1 and the air that has entered the recesses 20 and 20 formed between the center hull 30 and the side hulls 31 and 31 does not escape from between the side hull and the water surface. Since the air is compressed in the recesses 20 and 20, it is possible to obtain a higher ground effect than that of a conventional watercraft with hydrofoil having aerial blades protruding from the hull.

When the hull is tilted, the distance between the tilted hull and the water surface is narrowed, that is, the recess 20 formed by the center hull 30 and the tilted side hull 31 is reduced in size and the recess 20 is formed. Since the inflowing air is further compressed and the ground effect is enhanced, the restoring force acts in the direction to return the inclination of the hull to the original state, and the attitude of the hull can be maintained.

Furthermore, since the propulsion unit 15 consisting of a normal underwater propeller can be used, noise can be reduced, and since it is not necessary to provide flight wings on the hull, an extra space that interferes is generated. Absent.

By adjusting the angle of attack of the hydrofoil 16 and adjusting the lift force generated by the hydrofoil 16, the floating amount of the hull is maintained, the hull floats too much, and the space between the hull and the water surface is increased. This prevents the ground effect from weakening due to a distance or air escaping between the side hulls 31 and 31 and the water surface.

Further, a step 30a is formed in front of the hydrofoil 16 of the center hull 30 so that the air flowing into the recesses 20 and 20 at the time of a sudden wave impact does not escape from the front. Since the air is further compressed and the air cushion effect is produced, the riding comfort is improved.

[0019]

Since the present invention is constructed as described above,
The following effects are achieved.

That is, as claimed in claim 1, a hydrofoil with a hull comprising a center hull and a side hull having recesses on the left and right sides of the ship bottom, wherein a propulsion device consisting of an underwater propeller is provided at the stern. Therefore, the hull is configured as a trimarine, and because it floats due to the lift generated by the hydrofoil and the lift generated on the hull due to the ground effect, the contact area between the bottom of the ship and water becomes small, and the resistance that the bottom receives from water is reduced. The force is reduced, the speed can be efficiently increased, and the noise can be reduced. Further, since an air layer is formed in the recess between the hull and the water surface due to the ground effect, it becomes a cushion at the time of a wave impact, the riding comfort is improved, and the attitude of the hull can be easily maintained.

Since the aerial propeller is used for the propulsion device as described in claim 2, the speed can be further increased.

Since the step is formed on the front side of the center hull as described in claim 3, the air does not escape from the concave portion to the front at the time of a sudden wave impact and is compressed higher, so that an air cushion effect is produced. The riding comfort is improved.

[Brief description of drawings]

FIG. 1 is a side view of a ground effect wing ship with hydrofoil of the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is a bottom view of the same.

FIG. 4 is a diagram showing a relationship between speed and output.

FIG. 5 is a front view of a conventional hydrofoil.

[Explanation of symbols]

10 Vessels with hydrofoil 13 Ship bottom 15 propulsion machine 20 recess 30 center hull 30a step 31 Side Hull

Claims (3)

[Claims] 1. A hydrofoil with a hull comprising a center hull and side hulls having recesses on the left and right sides of the bottom of the ship, wherein the hydrofoil has a propulsion unit consisting of an underwater propeller at the stern. With ship. 2. The hydrofoiled vessel according to claim 1, wherein an aerial propeller is used as the propulsion device. 3. The watercraft with hydrofoils according to claim 1, wherein a step is formed on the front side of the center hull.