JP2929702B2 - Catamaran - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a catamaran capable of reducing wave making resistance over a wide speed range from a low speed range to a high speed range.

[Prior Art] As a ship capable of high-speed navigation, a planing boat, a semi-planing boat, a hydrofoil boat, a boat using air pressure, and the like are generally used. However, these are all small vessels and reduce the amount of drainage. Moreover, the conventional type is a ship type with large wave resistance in the low-speed range, is easily affected by large waves, and is not suitable for large ships because the structure needs to be light. I have. In particular, the weight of a large ship increases, and if the weight increases, it becomes difficult to achieve high speed.

On the other hand, a displacement type catamaran is known as having good navigation stability even under the influence of waves such as shear waves.

[Problems to be Solved by the Invention] However, in the case of the above-mentioned displacement type catamaran, a large displacement (that is, buoyancy) can be obtained by submerging most of the catamaran portion for low-speed navigation. Therefore, even if the power is increased in order to increase the speed, large resistance is generated near the last hump, and the generated waves increase mutual interference between the twin bodies, increasing the wave-making resistance. As a result, it becomes difficult to perform high-speed navigation.

Therefore, the present invention seeks to provide a catamaran capable of reducing the amount of drainage that has been a bottleneck for speeding up, and reducing wave making resistance over a wide speed range from a low speed range to a high speed range. Things.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a catamaran in which a ship body is mounted on left and right hulls, wherein the left and right hulls are formed to be slender. It is designed to be an elongated boat type, and the ratio of the water line length of the body to the 1/3 power of the drainage volume has a value in the range of 11 to 15.

[Effect] The two body parts are super slender, and the water line length and the drainage volume are 1 /
By setting the value of the ratio to the third power to be 11 to 15, it is possible to reduce wave making resistance in a wide speed range from a low speed range to a high speed range.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 and 2 show one embodiment of the present invention.
In a catamaran which is mounted and integrated on the left and right trunks 2 extending in the bow-and-sail direction, and is set so that the whole is located above the draft line when fully loaded, The body 2 is formed to be very elongated to form a long and slender boat, and the ratio L / V ^{1/3 of the} water line length L to the 1/3 power of the drainage volume V has a value in the range of 11 to 15. I do.

The body 2 is a long, protruding bow portion 2a and aft stern portion 2b that project forward and backward from the ship body 1.
And a central portion 2c opposed to the ship main body 1 with the same width dimension.

In the catamaran according to the present invention having the above-described configuration, since the draft line FL at full load is set at the upper position of the side plate of the fuselage 2, basically, the right and left trunks 2 located at the lower portion of the ship main body 1. Is submerged in the water, the overall buoyancy is obtained in accordance with the displacement type catamaran described above, and the stability peculiar to the catamaran is obtained based on the two right and left hulls 2.

In addition, at the height level of the draft line FL when fully loaded, the value of the ratio L / V ^1/3 of the length dimension of the water line L, which is the length dimension of the right and left trunks 2, to the 1/3 power of the drainage volume V is 11. Because it is set to be within the range of ~ 15, when sailing, it will be in a wave breaking state and suppress the wave making phenomenon, and it is possible to perform high speed navigation while being similar to the displacement type catamaran, The wave-making resistance can be reduced over a wide speed range from to the high-speed range.

FIG. 3 shows the experimental results of the relationship between L / V ^1/3 and EHP at 40 knots at 3500 tons, where L = 155 m and L
= 169m, L = 200m for a large ship, or L =
16m, L = 20m, and L = 24m for small boats, respectively. As is clear from the experimental results shown in FIG. 3, when the value of L / V ^1/3 is in the range of 11 to 15 for both large and small ships, the EHP 3000
It can be seen that it can be suppressed below. L / V ^1/3
Exceeds 15, the flooded area (surface area) of the body 2 increases, and if the value of L / V ^1/3 is less than 11, the wave-making resistance reduction effect cannot be expected. Accordingly, by setting the value of L / V ^{1/3 in} the range of 11 to 15, the effective utilization rate of the propulsion power is improved, and high-speed navigation can be easily performed by expanding the speed limit range.

It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the scope of the present invention.

[Effects of the Invention] As described above, according to the catamaran of the present invention, the left and right hulls are formed to be slender and slender, and the ratio of the water line length to the 1/3 power of the drainage volume is obtained. Is set to 11 to 15, so that the safety inherent in catamaran can be obtained, and a large speed range from low speed to high speed for both large and small vessels Therefore, the wave-making resistance can be reduced over a wide range, and therefore, an excellent effect such as that high-speed navigation is enabled by effective use of the propulsion power is exhibited.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing one embodiment of a catamaran of the present invention,
FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a view showing an experimental result of a relationship between EHP and L / V ^1/3 . 1 ... ship body, 2 ... trunk, L ... water line length.

Claims (1)

(57) [Claims] 1. A catamaran having a main body mounted on left and right trunks, wherein the left and right trunks are formed to be elongated to form an ultra-slim boat shape, and a water line length and a drainage volume of the trunk are set to one. The ratio to the / 3 power is 1
A catamaran characterized by having a value in the range of 1 to 15.