JPH07251787A - Hydrofoil-equipped catamaran type gliding vessel - Google Patents

Abstract

PURPOSE:To provide a high-speed ship which revolves as it is safely inclined toward the center of revolution and which can be safely operated in worse weather than with conventional ships, without requiring an expensive control unit that frequently fails. CONSTITUTION:A hull body having a gliding surface 1 is of a catamaran type with a hydrofoil 2 provided between two hulls. In order to prevent the hydrofoil 2 from being exposed above the surface 4 of water during gliding, the keel 5 of the right and left hulls is formed into a wall shape to be set lower than the gliding surface 1 deep below the surface of water, and the hydrofoil is provided to the lowered part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-sliding ship having a catamaran fitted with fully submerged hydrofoils.

[0002]

2. Description of the Related Art Conventional catamaran planing boats have strong lateral stability such as rolls, but have poor stability on rough water surfaces, such as jumping, standing, popping (exercise like jumping). It showed severe behavior and was uncomfortable to ride. In addition, it could not be used on rough water, or if it could be done, it was very dangerous. The conventional fully submerged hydrofoil has high weather resistance and can be used even on rough water surface, but it is extremely weak against lateral rolls and is equipped with auxiliary wings etc. and controlled using an expensive control device. There was a need. Already developed and put into practical use is a displacement type hull (hereinafter referred to as HC) that has a catamaran fitted with fully submerged hydrofoils, but this existing type tilts to the outside of the turning when turning. There is a sense of discomfort, and there is a risk of capsizing without a control device.

[0003]

SUMMARY OF THE INVENTION The present invention combines a catamaran type planing boat with good lateral stability but poor weatherability with a fully submerged hydrofoil with good weatherability but no lateral stability. In order to counteract the problem, and further to develop a ship that leans toward the center of turning and stabilizes like a plane when turning, research was advanced.

[0004]

[Means for solving the problem] When hydrofoils are provided between the left and right bodies of a catamaran type planing boat, the left and right bodies produce an effect called a wing end plate effect, which can reduce resistance, but There is a danger that the wings will be exposed above the surface of the water as it will almost slide on the surface. Therefore, as a result of experiments and theory with a model ship, it is better to make the keel (keel bone) of the left and right fuselage into a wall shape and lower it deeper below the water surface than the gliding surface (bottom of the fuselage) and attach two fully submerged hydrofoils to it. I found that. We also discovered that if the left and right torso are brought close enough and the shape of the planing surface is devised, they can safely turn while leaning toward the center of turning.

[0005]

[Function] The left and right planing surfaces have the effect of suppressing rolling of the ship. The fully submerged hydrofoil has the effect of suppressing pitching, similar to an airplane. In this way, the sliding surface and hydrofoil share the role of each other to compensate for their defects, so that high weather resistance can be realized without a control device. At the time of turning, a water flow that crosses the hull under the running surface is generated, so that a pressure difference is generated due to the action of the shape of the running surface, and it is possible to stably turn while leaning toward the turning center.

[0006]

EXAMPLES In order to carry out the present invention,

The hull form was designed as shown in FIG.

[0007]

The ship embodying the present invention does not require expensive and troublesome control units. The results of the towing test of the model ship, the radio-controlled self-propelled test,

[Figure 4]

As shown in FIG. 6, the ship embodying the present invention has reduced pitching and pitching by about 40% as compared with the conventional planing boats (most of the current small-sized and medium-sized high-speed boats are of this type). ,
Also, the vertical acceleration was reduced by about 40%. Behavior such as jumps is difficult to show even on rough water. In addition, when turning, it can be safely turned by leaning toward the turning center side, and there is little risk of overturning even in bad weather. Therefore, it can be used on the surface of water that is considerably rougher than the conventional planing boat and HC. Therefore, if the present invention is applied to a leisure boat, high safety will be realized. Also, if it is carried out on rescue boats, it will be able to operate even in the sea of mosquitoes, which has been postponed for rescue activities, and the risk of a secondary disaster will be reduced.

[Brief description of drawings]

FIG. 1 A catamaran planing boat with hydrofoils of the present invention

[Fig. 2] Conventional planing boat (currently small and medium-sized high-speed boats are almost all of this type)

FIG. 3 An example of a conventional fully submerged hydrofoil (requires a controller)

FIG. 4 Comparison of pitching amplitude in regular heading waves between a conventional planing boat and a ship embodying the invention.

[Fig. 5] Pitching (heaving) during regular oncoming waves
Amplitude comparison of a conventional planing boat with a ship embodying the invention

FIG. 6 A comparison of the amplitude of vertical motion acceleration in a regular heading wave between a conventional planing boat and a ship embodying the present invention.

[Explanation of symbols]

 These symbols are common to all figures. 1) Planing surface 2) Hydrofoil 3) Auxiliary wing 4) Water line during cruising 5) Wall-shaped keel

Claims (2)

[Claims] 1. A planing boat having hydrofoils between a left body and a right body. 2. The planing boat according to claim 1, wherein the keels of the left and right fuselage are lowered downward in a wall shape, and the hydrofoils are provided at a deep position below the water surface.