JPH0594095U - Hydrofoil rudder - Google Patents

Abstract

(57) [Summary] [Purpose] In the rudder of a hydrofoil, the ventilation phenomenon during steering is reliably prevented, the efficiency of the rudder is improved, and the rudder is downsized. [Structure] A rudder 14 is provided below a center pod 12A at a lower end portion of a front strut 12 of a fully submerged hydrofoil.
Since the upper part of the rudder 14 is covered with the center pod 12A and the front wing 13, a ventilation phenomenon in which air on the water surface flows into the negative pressure side of the rudder 14 does not occur during steering, and the performance of the rudder 14 is improved. The rudder may be provided below the front wing 13.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rudder of a hydrofoil, and more particularly, to a rudder of a hydrofoil, which is designed to prevent a ventilation phenomenon.

[0002]

[Prior Art]

 The fully-introduced hydrofoil (commonly known as a jetfoil) currently in practical use is the hull body, the front wings supported by front struts on the front part of the hull body, and the rear part of the hull body. It is equipped with a rear wing supported by rear struts and sails at a high speed of about 45 knots when the wing is running. Regarding the rudder of this type of fully submerged hydrofoil, the front strut is also commonly used as a rudder, the front strut is configured to be rotatable around the vertical axis, and the front strut is rotated by the drive mechanism. It is configured to turn left or right. On the other hand, a hydrofoil with a special rudder on the trailing edge of the lower part of the strut has been proposed. For related prior art, refer to JP-A-59-195489 and JP-A-4-19288.

[0003]

[Problems to be solved by the device]

 When the front strut is also used as a rudder as described above, there is a problem that the pivoting mechanism for rotating the front strut about the vertical axis is complicated and the manufacturing cost thereof is high. On the other hand, when a dedicated rudder is provided on the trailing edge side of the lower part of the strut, the rudder is located underwater near the water surface.Therefore, during steering, air on the water surface flows into the negative pressure side of the rudder. There is a problem that a steering phenomenon (also called air draw) occurs and the efficiency of the rudder decreases significantly.

That is, when a rudder is provided in the lower part of the strut, a relatively small rudder is provided. Therefore, unless the rudder angle is increased, a sufficient turning moment cannot be obtained, but a rudder with a certain rudder angle or more is not obtained. At the corner, the negative pressure on the negative pressure side of the rudder increases and suddenly a ventilation phenomenon occurs, resulting in a drastic reduction in the rudder performance. Therefore, the maximum rudder angle cannot be set large, and it is difficult to reduce the rudder size. An object of the present invention is to provide a rudder of a hydrofoil ship which has a simple structure and can reliably prevent the occurrence of a ventilation phenomenon.

[0005]

[Means for Solving the Problems]

 The rudder of the hydrofoil according to claim 1 comprises a hull body, a front wing supported on the front part of the hull body via front struts, and a rear wing supported on the rear part of the hull body via rear struts. In a fully submerged hydrofoil equipped with, a center pod at the lower end of the front strut is provided with a rudder projecting downward. The rudder of the hydrofoil according to claim 2 has a hull body, a front wing supported on the front part of the hull body via front struts, and a rear wing supported on the rear part of the hull body via rear struts. In the fully submerged hydrofoil equipped with, the front wing is provided with a rudder protruding below. The rudder of the hydrofoil ship according to claim 3 is a hydrofoil ship including a hull body and a hydrofoil provided on the hull body, wherein the hydrofoil is provided with a rudder protruding downward. is there.

[0006]

[Action]

 The rudder of the hydrofoil according to claim 1, wherein in the fully submerged hydrofoil, the center pod at the lower end of the front strut is provided with a rudder protruding downward, so that the upper part of the rudder is Since it is covered by the center pod and the front wing, no ventilation phenomenon occurs and the maximum rudder angle can be set to a large value, which allows the rudder to be downsized. In the rudder of the hydrofoil according to the second aspect, in the fully submerged hydrofoil, since the rudder protruding downward is provided on the front wing, the same effect as that of the first aspect can be obtained. In the rudder of the hydrofoil according to claim 3, since the hydrofoil is provided with a rudder protruding downward, a ventilation phenomenon occurs because the upper part of the rudder is covered with the hydrofoil. Since the maximum steering angle can be set to a large value, the rudder can be downsized.

[0007]

[Effect of the device]

 According to the present invention, the following effects can be obtained as described in the section of the operation. According to the rudder of the hydrofoil of Claim 1, since the rudder protruding downward is provided on the center pad at the lower end of the front strut, the upper part of the rudder is the center pod and the front wing. Since it is covered with, the ventilation phenomenon does not occur, and the maximum rudder angle can be set large, so that the rudder can be downsized. According to the rudder of the hydrofoil of the second aspect, since the rudder protruding downward is provided on the front wing, the same effect as that of the first aspect can be obtained. According to the rudder of the hydrofoil of claim 3, the hydrofoil of the hydrofoil is provided with the rudder protruding below the hydrofoil. Therefore, the same effect as that of claim 1 can be obtained.

[0008]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present embodiment is an example of a case where the present invention is applied to a high-speed, fully submerged wing-type hydrofoil ship, which is commonly called a jet foil. As shown in Fig. 1 and Fig. 2, a front strut 12 which also serves as a ladder of a wing section is provided in the lower center of the bow of the hull 10 of a hydrofoil JF around its vertical axis and horizontal horizontal axis at its upper end. The center pod 12A at the lower end of the front strut 12 is provided with a front wing 13 and the front wing 13 is provided with a front flap 14 at the trailing edge thereof. .. The front strut 12 is vertically extended downward as shown in the drawing when the wing is running, and is rotated horizontally in the direction of the arrow 11 to be raised forward horizontally when the boat is running.

At the lower part of the stern of the hull 10, a pair of left and right rear struts 22.22 are provided rotatably at their upper ends via horizontal horizontal support pins 21. A center strut 23 is rotatably provided at an intermediate position between the left and right rear struts 22 and 22 at its upper end via a horizontal pivot pin in the left-right direction, and the lower ends of the port rear strut 22 and the starboard rear strut 22. Rear blades 24 are provided so as to extend across each other, and the rear blades 24 are also fixed to the lower end portion of the center strut 23.

At the trailing edge of the rear wing 24, a total of four rear flaps on the port side and two on the starboard side are provided. However, in the normal case, the inner rear flap and the outer rear flap of each port are operated synchronously. A water jet type propulsion device (not shown) is provided over the center strut 23 and the bottom of the hull near the upper end thereof. However, a propeller type propulsion device may be provided instead. When the wing is running, the rear struts 22 and the center strut 23 are vertically extended downward as shown in the figure, and when the boat is running, the rear struts 22 and 22 and the center strut 23 are pivoted in the direction of arrow 25 and horizontally raised backward.

A hydraulic actuator for rotating and driving the front flap 14, the port inner rear flap, the port outer rear flap, the starboard inner rear flap and the starboard outer rear flap, respectively, is provided, and the front strut 12 has a vertical axis. A hydraulic actuator for rotating the front strut 12 is provided, and a hydraulic actuator for rotating the front strut 12 forward about a horizontal axis and the rear strut 22, 22, 23 is rotated about the pivot shaft 21. A hydraulic actuator that is dynamically driven is also provided.

Next, the rudder 14 of the hydrofoil JF, which is a characteristic configuration of the present application, will be described. As shown in FIGS. 3 and 4, below the center pod 12A, a rudder 14 having a wing-shaped cross section and a rectangular side view is provided in a vertical direction. A vertical support shaft 15 extending upward from the front end portion of the rudder 14 extends into the center pod 12A and is rotatably supported by a bearing member 19, and an arm 16 is fixed to the upper end of the support shaft 15 and a center pot A connecting metal fitting 17 at the tip of the rod of a double-acting hydraulic cylinder 18 oriented in the front-rear direction provided in the door 12A is connected to the arm 16 via a vertical pin 20. It is constructed so that it can be driven to rotate forward and backward.

Since the hydrofoil JF navigates at a high speed of about 45 knots, the rudder 14 may be of a comparatively small size, but if necessary, the width in the front-rear direction may be expanded more than that shown in the drawing. Alternatively, the vertical width may be increased. Further, the support shaft 15 may be configured so as to extend upward in the front strut 12, and the support shaft 15 may be rotationally driven by a hydraulic cylinder or a hydraulic motor provided in the hull 10.

Next, the operation of the rudder 14 of this hydrofoil JF will be described. Since the rudder 14 is arranged below the center pod 12A, the upper part of the rudder 14 is covered with the center pod 12A and the front wing 13, and the distance from the water surface to the rudder 14 is large and the water pressure is a little. Since it is large, even if a negative pressure is generated on one side of the rudder 14 during steering, a ventilation phenomenon in which air above the water surface flows into the negative pressure portion does not occur. Therefore, the efficiency of the rudder 14 is high, the turning performance is excellent, and the maximum rudder angle can be set large, so that the rudder 14 can be downsized.

Next, another embodiment will be described. As shown in FIG. 5, a pair of left and right front wings 13 are respectively provided with vertical rudders 14A having an airfoil cross section, and the pair of left and right rudders 14A are left and right with respect to a vertical plane including the hull centerline. Similarly to the rudder 14, each rudder 14A is rotatably supported by the front wing 13 via a support shaft extending upward from the front end of the rudder 14A. It is configured such that it can be driven to rotate forward and backward. Since a pair of left and right rudders 14A is provided, each rudder 14A may be smaller than the rudder 14 described above.

In the above-mentioned embodiment, the case in which the present invention is applied to the largest hydrofoil currently in practical use has been described. However, it is a larger hydrofoil with a pair of left and right strut. In a hydrofoil with a toe, a pair of left and right hydrofoils can be provided with a pair of left and right rudders projecting below.

[Brief description of drawings]

FIG. 1 is a side view of a hydrofoil according to an embodiment.

FIG. 2 is a front view of the hydrofoil of FIG.

3 is a perspective view of the front strut, front wing and rudder of the hydrofoil of FIG. 1. FIG.

FIG. 4 is a perspective view of a main part of a rudder of the hydrofoil of FIG. 1.

FIG. 5 is a view corresponding to FIG. 3 according to another embodiment.

[Explanation of symbols]

 JF hydrofoil 10 hull 12 front strut 12A center pod 13 front wing 14 rudder 14A rudder

Claims (3)

[Scope of utility model registration request] 1. A fully submerged body comprising a hull body, a front wing supported on the front part of the hull body via front struts, and a rear wing supported on the rear part of the hull body via rear struts. In a wing-type hydrofoil ship, a rudder of the hydrofoil ship, wherein a center pod at a lower end portion of the front strut is provided with a rudder projecting downward. 2. A fully submerged body comprising a hull body, a front wing supported on the front part of the hull body via front struts, and a rear wing supported on the rear part of the hull body via rear struts. In a wing-type hydrofoil ship, a rudder of the hydrofoil ship, wherein the front wing is provided with a rudder protruding downward. 3. A hydrofoil ship comprising a hull body and a hydrofoil provided on the hull body, wherein the hydrofoil is provided with a rudder projecting below the hydrofoil. Rudder.