JPH06305413A - Side wall type air cushion hydrofoil craft - Google Patents

Abstract

PURPOSE:To prevent a side wall type air cushion hydrofoil craft, which is provided with a hydrofoil to control the attitude of the hull, from being subjected to excessive bending force at the hydrofoil mounted portion by giving a level difference especially between a water level in an air cushion room and a water level outside the hull. CONSTITUTION:In a craft which has an air cushion room 5 between mutually right and left body side walls 3, 3, a hydrofoil 4 located at the lower end of the hull side wall 3 to control the attitude of the hull is formed with the outside portion 4a and the inside portion 4b. The hydrofoil area of the inside portion 4a is formed larger than that of the outside portion 4a or the flap operation angle of the inside portion 4b is controlled greater than that of the outside portion 4a so that the outside portion 4a and the inside portion 4b of the hydrofoil can have almost the same lift, whether there is a level difference between a water level 1 outside the hull and a water level 2 in the air cushion room 5 or not.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a side wall type air cushion ship having an air cushion chamber between the left and right side walls of a hull, and more particularly to a hydrofoil for controlling the attitude of the hull during sailing. The present invention relates to a sidewall type air cushion ship with hydrofoils.

[0002]

2. Description of the Related Art There is a conventional side wall type air cushion ship with hydrofoil as shown in FIGS. 5 (a), 5 (b) and 5 (c). FIG. 5 (b) is a side view of the hydrofoil mounting portion, and FIG. 5 (c) is a plan view of the hydrofoil mounting portion. As shown in FIGS. 5 (a) to 5 (c), an air cushion chamber 5 for supporting a part of the weight of the hull is formed between the left and right hull side wall parts 3 and 3, and a high pressure air supply (not shown) is formed. Connected to the means. Further, hydrofoils 4 and 4 for hull attitude control are separately supported at the lower ends of the left and right hull side wall parts 3 and 3 via struts 6.

[0003]

By the way, in the conventional side wall type air cushion ship with hydrofoil as described above, the hydrofoil 4 has the same outer part 4a as the hydrofoil outer part 4a which extends outward from the mounting part of the hydrofoil 4 by the column 6. Although the hydrofoil inner part 4b extending inward from the mounting portion has the same wing area, the air cushion chamber 5 is larger than the water surface 1 on the outer side of the hull while the hull is in motion.
Since the level of the water surface 2 inside becomes low, the hydrofoil outer part 4
a produces a larger lift than the inner portion 4b of the hydrofoil where the submersion depth becomes shallower, and as a result, the hydrofoil 4 by the support column 6 is generated.
There is a problem that bending force acts on the attachment part of.

The present invention is intended to solve such problems, and the outer portion and the inner portion of the hydrofoil, which are separately attached to the lower ends of the left and right side wall portions of the hull, respectively, are the navigation of the hull. The same level of lift force is generated regardless of the level difference between the water surface outside the hull and the water surface inside the air cushion room.
An object of the present invention is to provide a sidewall-type air cushion ship with a hydrofoil in which the bending force acting on the hydrofoil mounting portion can be minimized.

[0005]

In order to achieve the above-mentioned object, a side wall type air cushion ship with hydrofoil of the present invention has an air cushion chamber between the left and right hull side wall parts and the hull side wall part. And a pair of left and right hull attitude control hydrofoils supported separately at each lower end of the hull, and the hydrofoil outer part extending outward from the attachment part to the lower end of the hull side wall and the hydrofoil outer part described above. The inner part of the hydrofoil that extends inward from the mounting part, and the outer part of the hydrofoil and the inner part of the hydrofoil regardless of the level difference between the water surface inside the air cushion chamber and the water surface outside the hull during navigation. The inside portion of the hydrofoil has a larger blade area than the outside portion of the hydrofoil so that the portions generate substantially the same lift at the same blade angle.

Further, the side wall type air cushion ship with hydrofoil of the present invention is characterized in that the inner part of the hydrofoil has a larger wing width than the outer part of the hydrofoil.
Further, the sidewall-type air cushion ship with hydrofoil of the present invention is characterized in that the inner part of the hydrofoil has a larger chord length than the outer part of the hydrofoil.

Further, the side wall type air cushion ship with hydrofoil of the present invention is provided with an air cushion chamber between the left and right side wall portions of the hull, and is supported separately at each lower end of the side wall portion of the hull and is opposed to the left and right sides. A hydrofoil for controlling the attitude of the hull, the hydrofoil having a flap extending outward from an attachment portion to the lower end of the side wall of the hull and a flap extending inward from the attachment portion. The inner part of the hydrofoil and the inner part of the hydrofoil have almost the same lift regardless of the level difference between the water surface inside the air cushion chamber and the water surface outside the hull. It is characterized in that a flap control system for separately controlling the operating angle of the flap in the outer portion of the hydrofoil and the operating angle of the flap in the inner portion of the hydrofoil to be generated is provided.

[0008]

In the above-described side wall type air cushion ship with hydrofoils of the present invention, the level of the water surface in the air cushion chamber becomes lower than the water surface on the outer side of the hull during traveling. Since the inner part of the hydrofoil has a larger blade area than the outer part of the hydrofoil so that almost the same lift can be generated with the same blade angle, it has the effect of sufficiently reducing the bending force acting on the hydrofoil attachment part. Done. In addition, even if there is a flap control system that separately controls the operating angle of the flap on the inside portion of the hydrofoil and the operating angle of the flap on the outside portion of the hydrofoil, the water surface inside the air cushion chamber and the water surface outside the hull during navigation are Since the flap control by the above control system is performed so that the outer portion of the hydrofoil and the inner portion of the hydrofoil generate almost the same lift force regardless of the level difference, the bending force acting on the hydrofoil mounting portion is reduced. Become.

[0009]

Embodiments of the present invention will now be described with reference to the drawings. FIGS. 1 (a) and 1 (b) show a side wall type air cushion ship with hydrofoil as a first embodiment of the present invention.
1 (a) is a cross-sectional view of the hull, and FIG. 1 (b) is a side view of the hydrofoil mounting portion. As shown in FIGS. 1 (a) and 1 (b),
An air cushion chamber 5 for supporting a part of the hull weight is formed between the left and right hull side wall parts 3, 3 and is connected to a high pressure air supply means (not shown).

Further, watercraft wings 4 and 4 for hull attitude control, which are separately supported via pillars 6 and are paired to the left and right, are provided at the lower ends of the left and right hull side wall portions 3 and 3, respectively. Each hydrofoil 4
Is composed of a hydrofoil outer portion 4a extending outward from an attachment portion to the lower end of the hull side wall portion 3 by the support column 6 and a hydrofoil inner portion 4b extending inward from the attachment portion. The outer portion 4a of the hydrofoil regardless of the level difference between the water surface 2 in the air cushion chamber 5 and the water surface 1 on the outer side of the hull during traveling.
The inner portion 4b of the hydrofoil has a larger blade area than the outer portion 4a of the hydrofoil by about 5 to 20% so that the and the inner portion 4b of the hydrofoil can generate almost the same lift at the same blade angle.

That is, in the first embodiment shown in FIGS. 1 (a) and 1 (b), the outer portion 4a and the inner portion 4b of the hydrofoil 4 have the same chord length, but the width is the hydrofoil. The inner portion 4b is formed to be larger than the hydrofoil outer portion 4a by about 5 to 20%. The blade angle here includes both an operating angle for controlling the rotation of the entire hydrofoil and a flap operating angle for providing a movable flap.

With the above-mentioned structure, in the first embodiment,
Even when the water surface 2 in the air cushion chamber 5 is pushed down by the high-pressure air in the air cushion chamber 5 during traveling and becomes lower than the level of the water surface 1 on the outer side of the hull, that is, the submersible depth of the inner portion 4b of the hydrofoil is reduced. Even if it becomes shallower than the outer part 4a of the hydrofoil, the lifts generated in both parts 4a, 4b become almost equal by the same blade angle control, and in this way, the bending force exerted on the mounting part of the hydrofoil 4 by the support column 6 is sufficient. It is reduced. Further, since the hydrofoil outer portion 4a and the hydrofoil inner portion 4b have the same chord length, there is also an advantage that the configuration for controlling the blade angle is simplified.

FIGS. 2 (a) and 2 (b) show a second embodiment of the present invention. FIG. 2 (a) is a cross-sectional view of the main part of the hull and a plan view of its hydrofoil mounting part. As is apparent from FIG. 2 (b), in this second embodiment, the hydrofoil outer portion 4a and the hydrofoil inner portion 4b have the same wingspan, but the hydrofoil inner portion 4b is the same. Has a chord length which is 5 to 20% larger than the hydrofoil outer portion 4a. Thus, in this second embodiment, the hydrofoil inner portion 4b has a larger blade area than the hydrofoil outer portion 4a, and the level difference between the water surface 2 in the air cushion chamber 5 and the water surface 1 on the outer side of the hull is shown. Regardless, the hydrofoil outer part 4a and the hydrofoil inner part 4b are configured to generate substantially the same lift force with the same blade angle control.

Therefore, in the case of the second embodiment as well, the effect of reducing the bending force acting on the mounting portion of the hydrofoil 4 as much as possible as in the case of the first embodiment described above is obtained, and the air cushion of the hydrofoil inner portion 4b is obtained. There is an advantage that the amount of protrusion to the chamber 5 side does not have to be large. The first embodiment and the second embodiment described above
In the embodiment, the hydrofoil 4 is described as being capable of controlling the blade angle. However, even when each hydrofoil 4 is fixed, the reaction of water acting on the hydrofoil 4 depending on the inclination of the hull is prevented. By force,
The attitude of the hull will be restored.

FIGS. 3 (a) and 3 (b) show a flap angle control state of a hydrofoil in a sidewall type air cushion ship with hydrofoil as a third embodiment of the present invention, and FIG. FIG. 3 is a blade cross-sectional view showing a flap angle control state of an outer portion of the hydrofoil.
(b) is a blade cross-sectional view showing a flap angle control state of the inner portion of the hydrofoil. The sidewall-type air cushion ship with hydrofoil of the third embodiment has substantially the same hull structure as in the above-described first and second embodiments, but the hydrofoil outer part constituting the hydrofoil 4 is formed. 4a and hydrofoil inner part 4b have substantially the same blade area, and both movable flaps 4af, 4bf
It has

Outside the hydrofoil so that the hydrofoil outer part 4a and the hydrofoil inner part 4b can generate almost the same lift regardless of the level difference between the water surface inside the air cushion chamber and the water surface outside the hull during traveling. A flap control system for separately controlling the operating angle α of the flap 4af in the portion 4a and the operating angle β of the flap 4bf in the hydrofoil inner portion 4b is provided. FIG. 4 is a block diagram showing an example of the flap control system. For example, when the hull inclines to the port side, a detection signal from the hull attitude detector requires the port hydrofoil to generate a positive lift. The starboard hydrofoil will be required to generate negative lift.

The control signals from the flap controllers on the port-side hydrofoil and the starboard-side hydrofoil are adjusted according to the detection signal from the level difference detector that detects the level difference between the water surface inside the air cushion chamber and the water surface outside the hull. And is separately fed to the hydrofoil outer partial flap actuator and the hydrofoil inner partial flap actuator. As a result, the flap working angle of the inner part of the hydrofoil with a shallow submersion depth is controlled so as to be larger than the flap working angle of the outer part of the hydrofoil with a deep submersion depth. Will generate almost the same lift,
In this way, the bending force at the hydrofoil attachment is reduced. As described above, in the third embodiment, the flap control system is individualized for the hydrofoil outer portion 4a with flaps and the hydrofoil inner portion with flaps, so that the flaps have the same shape and the same size. There is an advantage that flap control is performed so that the same lift force can be generated regardless of the level difference of the water surface, and generation of an excessive bending force at the hydrofoil mounting portion can be avoided.

[0018]

As described in detail above, according to the sidewall type air cushion ship with hydrofoil of the present invention, the following effects can be obtained. (1) The inner part of the hydrofoil has a larger blade area than the outer part of the hydrofoil, and both parts generate almost the same lift at the same blade angle regardless of the level difference between the inner and outer water surfaces. Therefore, it is possible to avoid the generation of an excessive bending force in the hydrofoil mounting portion. (2) If the inner part of the hydrofoil has a larger span than the outer part of the hydrofoil, the chord length of both parts should be the same as a means to make the inner part of the hydrofoil have a large blade area. Thus, the configuration for controlling the blade angle can be simplified. (3) If the inner part of the hydrofoil has a larger chord length than the outer part of the hydrofoil, the air of the inner part of the hydrofoil is There is an advantage that the amount of protrusion to the cushion chamber side does not have to be large. (4) By separating the flap control system for the outer part of the hydrofoil with flaps and the inner part of the hydrofoil with flaps, each flap has the same shape and size, but the same lift force is applied regardless of the level difference between the inside and outside water surfaces. There is an advantage in that the flap control is performed so that it can be generated, and the generation of an excessive bending force at the hydrofoil mounting portion can be avoided.

[Brief description of drawings]

FIG. 1 (a) is a lateral cross-sectional view of a hull showing a sidewall type air cushion ship with hydrofoils as a first embodiment of the present invention,
(b) is a side view of the hydrofoil attachment part.

FIG. 2 (a) is a lateral cross-sectional view of a part of a sidewall type air cushion ship with hydrofoils as a second embodiment of the present invention, and (b).
FIG. 4 is a plan view of the hydrofoil mounting portion.

FIG. 3 shows a hydrofoil in a side wall type air cushion ship with hydrofoil as a third embodiment of the present invention, where (a) is a cross-sectional view of an outer portion of the hydrofoil, and (b) is a hydrofoil thereof. It is a blade cross-sectional view of an inner portion.

FIG. 4 is a block diagram showing a control system of the hydrofoil flap of FIG.

FIG. 5 (a) is a lateral cross-sectional view of a conventional side wall type air cushion ship with hydrofoils, (b) is a side view of the hydrofoil mounting portion, and (c) is the hydrofoil mounting portion. It is a top view.

[Explanation of symbols]

 1 Water surface outside hull 2 Water surface inside air cushion chamber 3 Side wall part 4 Hull hydrofoil 4a Hydrofoil outer part 4b Hydrofoil inner part 4af, 4bf flap 5 Air cushion chamber 6 Strut

Claims (4)

[Claims] Claims: 1. An air cushion chamber is provided between the left and right side wall portions of the hull, and a pair of left and right hull attitude controlling hydrofoils are separately supported at the lower ends of the side wall portions of the hull to form a pair of water vessels. The wing is composed of a hydrofoil outer portion extending outward from the attachment portion to the lower end of the hull side wall portion and a hydrofoil inner portion extending inward from the attachment portion,
In order to generate almost the same lift at the same blade angle as the hydrofoil outer part and the hydrofoil inner part, regardless of the level difference between the water surface inside the air cushion chamber and the water surface outside the hull during sailing, the hydrofoil A side wall type air cushion ship with hydrofoils, characterized in that the inner part has a larger wing area than the hydrofoil outer part. 2. The hydrofoil according to claim 1, wherein the hydrofoil inner side portion has a larger wingspan than the hydrofoil outer side portion. Side wall type air cushion ship. 3. The sidewall-type air cushion ship with hydrofoil according to claim 1, wherein the hydrofoil inner portion has a chord length larger than that of the hydrofoil outer portion. Sidewall type air cushion ship with hydrofoils. 4. An air cushion chamber is provided between the left and right side wall portions of the hull, and the pair of left and right hull attitude controlling hydrofoils are separately supported at the lower ends of the side wall portions of the hull, and the pair of underwater water vessels are provided. The wing is composed of a hydrofoil outer part with flaps that extends outward from the attachment to the lower end of the side wall of the hull, and a hydrofoil inner part with flaps that extends inward from the attachment, In order for the hydrofoil outer part and the hydrofoil inner part to generate almost the same lift, regardless of the level difference between the water surface inside the air cushion chamber and the water surface outside the hull, the operation of the flaps on the hydrofoil outer part A side wall type air cushion ship with hydrofoils, characterized in that a flap control system for separately controlling an angle and an operating angle of the flap in the hydrofoil inner part is provided.