JPS60139584A - Half-submerged catamaran - Google Patents

Abstract

PURPOSE:To set a wave-making phenomenon produced by each brace down to a position interfering with one another as well as to aim at reduction in wave- making resistance by these braces, by setting up more than more pairs of these braces connecting a symmetrical pair of submerged bodies to an upper hull, while making a pair of braces among them movable in a longitudinal direction of the hull. CONSTITUTION:Two symmetrical submerged bodies 1 and 1 and an upper hull 4 are coupled together with each two of front braces 2 and 2 and rear braces 3 and 3. Both upper and lower parts of these two front braces 2 and 2 are supported by an upper brace sliding mechanism 11 and a lower brace sliding mechanism 10, and they are installed shiftably in a longitudinal direction of the hull without changing the relative position between the submerged body 1 and the upper hull 4. An interval between the front brace 2 and the rear brace 3 is changed to some extent according to a ship speed, setting wave crests produced by waves down to a position interfering with one another, and reduction in wave-making resistance produced by these braces is thus promotable.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a semi-submerged catamaran, and more particularly to a semi-submerged catamaran designed to reduce wave-making resistance due to struts.

Figures 1 to 3 show a conventional semi-submerged catamaran in which two left and right submerged bodies and an upper hull are connected by two struts each. Figure 1 is a side view, and Figure 2 is a side view. Its front view, FIG. 3, is a sectional view taken along the line ■-■ in FIG.

In Figures 1 to 3, 1 is a submerged body, 2 is a front support,
3 is the rear strut, 4 is the upper hull, 5 is the propeller, 6 is the rudder,
7 is the front fin, 8 is the rear fin, 9 is the water surface, 12.1
3 indicates the wave crest.

As shown in FIGS. 1 and 2, the semi-submerged catamaran has two submerged bodies 1.1 on the left and right that are provided below the water surface 9, and an upper hull 4 that is located above the water surface 9 and has a large area. 2 which penetrates the water surface 9 and connects and fixes each submerged body 1.1 and the upper hull 4;
It is composed of two front struts 2, 2 and a rear strut 3.3. As shown in FIG.
It is characterized by a significantly small cross-sectional area).

Further, a propeller 5 that generates thrust for navigation is installed at the rear end of each of the two submerged bodies 1, 1, and a rudder 6 for steering is provided behind the propeller 5.

On the other hand, in order to control the attitude of the ship during sailing, the front fins 7.7 and the rear fins 8,8 are connected to the two submerged bodies 1.
They are arranged so as to face each other between the two.

In such a semi-submerged catamaran, the submerged bodies 1, 1 having a drainage capacity to support the weight of the ship are placed below the water surface 9, and the portions that penetrate the water surface 9 are made of thin struts 2, 3. This reduces wave-making resistance and improves propulsion performance at high speeds compared to normal ship walls.

Further, since the water line area of the struts 2 and 3 is small and the stability of the bow 1 is small, the forward fin 7 and the rear fin 8 perform attitude control to obtain a restoring force.

As mentioned above, the semi-submerged catamaran is characterized by reducing the waterline area to reduce wave-making resistance, but due to the presence of the struts 2 and 3 that penetrate the water surface 9, the wave-making resistance is These pillars 2 and 3 are designed so that the wave-making resistance is minimized near the planned speed. In other words, in a semi-submerged catamaran having two or more pairs of struts as shown in Fig. 1, the waves created by the front struts 2.2 and the waves created by the rear struts 3, 3 interfere with each other, and the overall Support column 2 was installed to reduce wave resistance.
, 3 are designed. However, since the wavelength of the waves created by the props 2 and 3 changes depending on the speed of the ship, the props 2 and 3 are designed so that the best wave-making interference can be achieved near the planned speed. 3, there is a problem that if the speed deviates from the planned speed, the wavelength of the generated waves will change, the wave generation interference will deviate from the best condition, and the performance will deteriorate. For example, as shown in Fig. 3, when the wave crest 12 of the wave created by the front struts 2, 2 and the wave crest 13 of the wave created by the rear struts 3, 3 overlap, the wave-making resistance becomes very large.

The present invention aims to solve these problems, and by making the spacing between the struts variable, the wave-making interference by the struts is always created in the best possible manner according to the ship's speed. The purpose is to provide a semi-submerged catamaran with reduced resistance.

Therefore, the semi-submerged catamaran of the present invention has a pair of left and right submerged bodies located below the water surface, an upper hull located above the water surface, and a pair of left and right submerged bodies that penetrate through the water surface. A semi-submerged catamaran equipped with two or more pairs of struts each connected to a water body, characterized in that at least one pair of the two or more pairs of struts is provided so as to be movable in the longitudinal direction of the hull. There is.

Hereinafter, a semi-submerged catamaran as an embodiment of the present invention will be explained with reference to the drawings. Fig. 4 is a side view thereof, Fig. 5 is a front view thereof, and Fig. 6 is a cross section taken along line Vl-Vl in Fig. 4. FIG. 2 is a diagram in which previously described reference numerals indicate similar parts. Further, reference numeral 10 indicates a lower column sliding mechanism, 11 indicates an upper column sliding mechanism, and 14 indicates the crest of a wave generated after the front column moves backward.

As shown in Figures 4 and 5, two submerged bodies 1.1 and 1 on the left and right
The two upper hulls 4 are connected by two front struts 2, 2 and two rear struts 3, 3, and two of these front struts 2, 2 are connected by upper and lower upper struts, respectively. supported by a mechanism 11 and a lower column sliding mechanism 10;
It is provided so that it can be moved in the longitudinal direction of the hull without changing the relative position between the submerged body 1 and the upper hull 4, so that the front struts 2, 2 are arranged at optimal positions according to the ship speed. It has become.

Further, a propeller 5 that generates thrust for navigation is attached to the rear end of each of the two submerged bodies 1.1, and a rudder 6 for ruddering is arranged behind the propeller 5.

Furthermore, in order to control the attitude of the hull during sailing, the front fins 7.7 and the rear fins 8, 8 are connected to the two submerged bodies 1.
, 1 so as to face each other.

Since the semi-submerged catamaran of the present invention is constructed as described above, the distance between the front strut 2 and the rear strut 3 can be changed depending on the ship speed. If the wave resistance increases due to the overlap between the wave crest 12 of the wave created by the support 2 and the wave crest 13 of the wave created by the rear support 3, as shown by the broken line in Figs. , the front strut 2 is moved by a distance S, and the interference between the wave crests 14 and 13 of the new wave created by the front strut 2 is adjusted to be in the best condition.

This makes it possible to minimize wave-making resistance not only near the planned speed but also always in accordance with the ship's speed.

Note that the present invention can be similarly applied to a semi-submerged catamaran in which two left and right submerged bodies 1, 1 and one upper hull 4 are connected by three or more pairs of struts.

As detailed above, according to the semi-submerged catamaran of the present invention,
A pair of left and right submerged bodies located below the water surface, one upper hull located above the water surface, and two or more pairs of struts that penetrate the water surface and connect the upper hull to the left and right pair of submerged bodies, respectively. A semi-submerged catamaran has a simple structure in which at least one of the above two or more pairs of supports is movable in the longitudinal direction of the ship, and the best wave-making interference is always achieved according to the ship's speed. This has the advantage of significantly reducing the wave-making resistance caused by the pillars.

[Brief explanation of drawings]

Figures 1 to 3 show a conventional semi-submerged catamaran; Figure 1 is its side view, Figure 2 is its front view, and Figure 3 is a cross-sectional view taken along ■-■ of Figure 1. , FIGS. 4 to 6 show a semi-submerged catamaran as an embodiment of the present invention, FIG. 4 is a side view thereof, FIG. 5 is a front view thereof, and FIG. 'Vl-Vl
FIG. 1. Submerged body, 2. Front column, 3. Rear column, 4.
・Upper hull, 5...propeller, 6...rudder, 7...6;j
Directional fin, 8... Rear fin, 9... Water surface, 10... Lower column sliding mechanism, 11... Upper column sliding mechanism, 12゜1
3.14... wave crest. Sub-Agent Patent Attorney Yoshihiko Iinuma Figure 1 Figure 3 Figure 4 Figure 6 Procedural amendments (methods) 1 Indication of the case 1981 Patent Application No. 247178 2 Name of the invention Semi-submerged catamaran 3 Relationship with the case of the person making the amendment Applicant postal code 100 Address 2-5-1 Marunouchi, Chiyoda-ku, Tokyo Name (62
0) Mitsubishi Heavy Industries, Ltd. 4 Sub-Agent Postal code 160 Address 5-5 Minamimotomachi, Shinjuku-ku, Tokyo Date of amendment order 6 Full text of the specification subject to amendment. 7. Contents of amendment The entire text of the specification will be amended as shown in the attached sheet in order to make the text larger. 8 Complete list of attached documents and amendment specification (1 copy)

Claims (1)

[Claims] A pair of left and right submerged bodies located below the water surface, one upper hull located above the water surface, and two or more pairs of struts that penetrate the water surface and connect the upper hull to the left and right pair of submerged bodies, respectively. In a semi-submerged catamaran, two or more of the above
A semi-submerged catamaran, characterized in that at least one pair of the struts is movable in the longitudinal direction of the hull.