JPH0616189U - Catamaran hydrofoil - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a catamaran hydrofoil that can improve propulsion performance, is easy to construct, and provides stability during navigation. [Structure] The hydrofoils 13 and 14 of the catamaran hydrofoil 10 have both ends bent upward, and the ends that are the bent parts thereof.
The upper ends of 18 and 19 are connected to the bottom of the running and flooded part 16 which is the lower part of the hull 12. [Effects] Since the hydrofoils 13 and 14 can deepen the submersion in the water, broaching etc. are unlikely to occur when the catamaran hydrofoil 10 is running, and are also affected by the free surface of the water surface. It is possible to secure sufficient lift. Further, since each of the end portions 18 and 19 also has a rectifying effect as a vertical wing, the straight running stability of the catamaran hydrofoil 10 is also obtained.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a catamaran hydrofoil, and more particularly to a catamaran hydrofoil that provides stability during sailing.

[0002]

[Background technology]

 Conventionally, hydrofoil ships have reduced the wave-making resistance by floating the hull above the water surface with the levitation force of the hydrofoil installed at the lower part of the hull, further reducing the inundation area of the hull and causing friction with water. Resistance is also reduced to improve propulsion performance and at the same time improve athletic performance. In such hydrofoil vessels, it is desirable to minimize the inundation area during navigation in order to further improve the propulsion performance and maneuverability.

In such a combined-support hydrofoil with buoyancy and lift, a pair of hulls are arranged on the left and right of the hydrofoil in the advancing direction, and a right angle to the advancing direction is formed between the lower parts of these hulls. A catamaran hydrofoil equipped with various hydrofoils is known. Since the buoyancy of the catamaran hydrofoil is distributed to the left and right in the traveling direction, the attitude restoring force can be made stronger than that of a monohull hydrofoil, and stability during navigation can be obtained.

By the way, in a hydrofoil, it is desirable to make the submersion degree of the hydrofoil as deep as possible. That is, if the submerged degree of the hydrofoil is shallow, sufficient lift cannot be obtained due to the influence of the free surface of the water surface. If the hydrofoil is shallow, the hydrofoil is exposed from the water due to high waves or the like, and so-called broaching in which the hydrofoil is submerged is likely to occur. Therefore, when the hydrofoil re-enters the water, a large impact is applied to the hull, and stability during navigation cannot be obtained.

Therefore, in a catamaran hydrofoil, it is desirable to maximize the submersion of the hydrofoil, and the hydrofoil may be provided via a supporting member that hangs at the bottom of each pair of hulls. It has been proposed to extend part or all of the hull downwards and connect the end of the hydrofoil to its tip.

[0006]

[Problems to be solved by the device]

 However, in the method of providing hydrofoil via the support member, it is necessary to attach the support member to the lower part of the hull, which requires time and effort for manufacturing the hull and causes frictional resistance with water during sailing. There is a problem that the propulsion performance is reduced.

On the other hand, in the method of extending a part or all of the hull downward, the surface area of the flooded part at the time of traveling increases and the frictional resistance with water increases, so that the propulsion performance of the catamaran hydrofoil is improved. There is a problem of decrease.

An object of the present invention is to provide a catamaran hydrofoil vessel that can improve propulsion performance, can be easily constructed, and can provide stability during navigation.

[0009]

[Means for Solving the Problems]

 The present invention is a catamaran hydrofoil in which hydrofoils are provided between the lower parts of a pair of hulls, and both ends of the hydrofoil are bent upward, and the upper ends of the bent parts are located at the lower part of the hull. It is connected.

[0010]

[Action]

 In the present invention as described above, the immersion depth of the hydrofoil can be made deeper than that of the conventional catamaran hydrofoil by the length of the upward bending portions at both ends of the hydrofoil. Therefore, since it is not necessary to attach a support member to the lower part of the hull or extend the hull downward, the construction can be facilitated and the surface area of the flooded part can be reduced, thereby achieving the above object.

[0011]

Embodiment An embodiment of the present invention will be described below with reference to the drawings. The catamaran hydrofoil 10 of the present embodiment shown in FIGS. 1 and 2 is provided with a pair of front and rear hydrofoils 13, 14 between the lower portions of a pair of hulls 12 supporting a deck portion 11, and at the time of traveling. Each hull 12 floats above the water surface due to the buoyancy of the hydrofoils 13 and 14, and the water line of the hull is WL ₁ when stopped, but WL ₂ when sailed.

The hydrofoils 13 and 14 are formed in a substantially V shape in which the center line of the catamaran hydrofoil 10 is the lowermost part, and have similar cross-sectional shapes as a part of the hydrofoils 13 and 14. Each of the ends 18 and 19 is bent substantially upward, and each of these edges is connected to the bottom of the running and inundation section 16. The end portion 18 is set to be longer than the end portion 19 so that the hydrofoil 13 can be deeper in water than the hydrofoil 14. Although the end 18 is set longer than the end 19 in this embodiment, the end 18 may have the same length.

In the present embodiment as described above, the catamaran hydrofoil 10 has a structure in which the hull 12 floats above the water surface by the buoyant force of the hydrofoils 13 and 14 when traveling by the water jet, and the waterline WL ₂ The main body 15 is exposed above the water, and only the running water inundation part 16 and the hydrofoils 13, 14 are in a water submerged state, and the submergence degree of the hydrofoils 13, 14 is deeply held by the respective end parts 18, 19.

Therefore, in the catamaran hydrofoil 10, the submerged degrees of the hydrofoils 13 and 14 can be deeply held by the respective end portions 18 and 19, and broaching or the like is unlikely to occur.

Further, since the hydrofoils 13 and 14 can deepen the submersion degree, sufficient lift can be obtained without being affected by the free surface of the water surface.

Further, since the submersible blades 13 and 14 have different submergence degrees, the blade row interference due to the water flow is less likely to occur. Therefore, since the resistance due to the turbulent flow can be reduced, the thrust performance of the catamaran hydrofoil 10 can be improved.

Since the hydrofoils 13 and 14 are formed in a substantially V shape in which the center line of the catamaran hydrofoil 10 is the lowermost part, the submersion degree can be further increased.

Further, since the end portions 18 and 19 are a part of the hydrofoil 13 and 14, they act as vertical blades to obtain a rectifying effect, and the lift characteristic of the hydrofoil 13 and 14 is obtained as a blade end plate effect. You can improve.

Further, the hull 12 does not need to extend the running inundation part 16 downward in order to deepen the submersion degree of the hydrofoils 13 and 14, so that the hull 12 can be lightened and the inundation part And the propulsive performance of the catamaran hydrofoil 10 can be further improved.

It should be noted that the present invention is not limited to the above-described embodiments, and improvements, modifications and the like within the scope of achieving the present invention are included in the present invention.

For example, the cross-sectional shape of the end portions 18 and 19 is simply the same as that of the hydrofoil 13, 14, but may be a cross-sectional shape dedicated to the vertical blade, or a flap or the like may be provided.

Further, the hydrofoils 13 and 14 have been described as having a substantially V shape in which the center line of the catamaran hydrofoil 10 is the lowermost portion, but they may have an arc shape, a polygonal shape, or a flat plate shape. The shape is arbitrary and may be set appropriately.

Further, although a pair of hydrofoils 13 and 14 were provided in the traveling direction of the catamaran hydrofoil 10, a single or plural hydrofoils may be provided, and the number thereof is arbitrary.

The hydrofoils 13 and 14 have arbitrary connection points and submergence degrees with respect to the underwater running section 16, and may be set appropriately.

[0025]

According to the present invention as described above, it is possible to improve the kinetic performance and high-speed performance of a hydrofoil ship and to easily manufacture a hull.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a side view showing the embodiment.

[Explanation of symbols]

10 Catamaran hydrofoil which is a hydrofoil 11 Hull 12, 13 Hydrofoil 18, 19 Edge WL ₁ Drain line when stopped WL ₂ Drain line when sailed

Claims (1)

[Scope of utility model registration request] 1. A catamaran hydrofoil in which hydrofoils are provided between the lower parts of a pair of hulls, the hydrofoils having both ends bent upward, and the upper ends of the bent parts being the lower part of the hull. A catamaran hydrofoil characterized by being connected to.