JPS6018498A - Semisubmerged catamaran - Google Patents

Abstract

PURPOSE:To suppress the reduction of the propulsion performance by keeping the situation of a hull into normal state and reducing the resistance by supporting a vane-wheel propelling apparatus onto the revolution shaft in the nearly horizontal direction on the center side surface of the submerged body of a semisubmerged catamaran. CONSTITUTION:A stay 2 for holding, on the sea surface 8, a pair of submerged bodies 1 at right and left which are arranged in parallel under the sea water 8 and a main hull 3 is formed into a form to reduce the resistance on sailing. A vane-wheel propelling shaft 9 which is rotatable and whose angle can be varied is installed onto the center side surface where the bow part and the stern part of the submerged body 1 are opposed, and blades 10 for generating a thrust is installed. Since the magnitude and direction of the thrust can be arbitrarily varied by varying the pitch angle of the blade 10, the situation of the hull can be kept properly and horizontally, and the optimum situation is kept by controlling the direction of the thrust according to the speed, and the propulsion performance can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION FIG. 2 shows a perspective view of a semi-submerged catamaran in which the attitude of the hull is controlled by controlling the thrust direction of the propulsion device. As shown in these figures, in a conventional semi-submerged catamaran, a pair of submerged bodies 1 are arranged below the water surface 8, and are connected to the main hull 8 by struts 2 that penetrate the water surface 8, and each submerged body I It is propelled by a propeller 4 attached to the rear of the vehicle. Further, the rudder 5 is arranged behind each propulsion device. Furthermore, for attitude control during navigation,
The bow fin 6 is attached to the inside surface of the bow of the submerged body 1, and the stern fin 7 is attached to the bow inner surface of the submerged body 1.
is similarly attached to the inner surface of the stern of the submerged body 1.

The semi-submerged catamaran uses a pair of submerged bodies l placed below the water surface 8 to generate buoyancy, and by reducing the water line area of the strut 2 that penetrates the water surface 8 to reduce wave-making resistance. However, the hull shape was designed to improve propulsion performance at high speeds.

Because the waterline area is small, the hull's attitude changes easily depending on the cruising speed, such as shifting forward trim or rearward trim. To prevent this.

Fins 6 on the bow or stern or both.

7, by controlling the angle of attack of the fins 6 and 7, the lift generated on the wrinkled fins 6 and 7 is utilized.

It is necessary to adjust the attitude of the hull, and there are further disadvantages in that the resistance increases due to the fins 6.7 and the propulsion performance decreases.

In order to solve the above-mentioned drawbacks of the conventional semi-submerged catamaran, the present invention eliminates the attitude control fins in the conventional semi-submerged catamaran, and provides a semi-submerged catamaran that can maintain the normal attitude of the hull. Aims to provide water catamarans.

Therefore, the semi-submerged catamaran of the present invention has a pair of left and right submerged bodies located below the water surface and arranged approximately parallel to each other, and a main hull located above the water surface and suspended over the left and right submerged bodies. , in a semi-submerged catamaran equipped with one or more pairs of struts penetrating the water surface and connecting each submerged body and the main hull, the submerged body is supported by a substantially horizontal rotating shaft on the central side of the vessel. A key feature is the installation of a wheel propeller.

The semi-submerged catamaran of the present invention will be explained below with reference to one drawing.
Embodiment 1 of the present invention is a pair of left and right submerged bodies arranged approximately parallel to each other below the water surface 8, and is formed into a spindle shape to reduce resistance during navigation. This creates a buoyant force.

2 is a column whose lower end is connected to the upper surface of each submerged body 1, and whose upper end is connected to the main hull 3, and is erected through the water surface 8 to hold the main hull 3 above the water surface 8, and is a pillar that provides resistance during navigation. It is formed in a streamlined shape to prevent reduction, and is formed to have a narrow width at 8 parts of the water surface. In the example, the figure shows that the strut 2 is formed integrally in the longitudinal direction, but the strut 2 is divided into a plurality of parts in the longitudinal direction.
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The main hull 3 is spanned over both branch offices 21vl and used as a cabin or work space. Reference numeral 5 indicates a rudder provided at the stern of the main hull 8, and reference numeral 9 indicates a rotating shaft (not shown) installed approximately horizontally on the opposing center sides of the bow and stern portions of the submerged body 1, as shown in FIG. The blade propeller 10 is attached to a blade which rotates around the rotation axis and changes its angle so that thrust can be generated in any direction perpendicular to the rotation axis. It is. A portion of the side surfaces of the bow and stern sides of the submerged body l on the hull center side, to which the impeller propeller 9 is attached, are made flat. Blade wheel propulsion device 9
By changing the pitch angle of its blades 10, the magnitude of the thrust can be arbitrarily changed, and the direction of the thrust can also be arbitrarily changed, so if it is installed as described above, it can be used as a semi-submerged twin hull. It can be used for both propulsion and attitude control of the ship. That is, when the hull attitude is horizontal, the thrust direction of the R vehicle propeller 9 is horizontally forward, but when the bow trim is large, for example, the thrust direction of the wing wheel propeller 9 at the bow is generated forward and upward. If the thrust direction of the stern wheel propeller 9 is generated forward and downward, the ship's attitude can be kept properly horizontal. Also, the optimal posture for propulsion performance is not constant depending on the speed.

Propulsion performance can be improved by controlling the direction of thrust according to speed and maintaining an optimal posture. Compared to the conventional method of controlling with fins, there is no increase in resistance due to the fins, and this also improves propulsion performance.

In addition, in the above embodiment, the force explained for a semi-submerged catamaran (the present invention can also be applied to a normal catamaran).

[Brief explanation of the drawing]

Figure 1 Figure 2 shows a conventional semi-submerged catamaran.
The figure shows its side view, and FIG. 2 shows its rear view. FIGS. 3 and 4 show an embodiment of a semi-submerged catamaran according to the present invention, with FIG. 3 showing a side view and FIG. 4 showing a rear view, respectively. 1... Submerged body, 2... Support, 3... Main hull, 4...
...propulsion device, 5... rudder, 6, 7... fin, 8...
・Water surface, 9... impeller propeller, 10... blade.

Claims (1)

[Claims] A pair of left and right submerged bodies located below the water surface and arranged approximately in parallel, a main hull located above the water surface and suspended over the left and right submerged bodies, and a main hull that penetrates the water surface and connects each submerged body to the main hull. A semi-submerged catamaran equipped with one or more pairs of struts connecting the submerged body, the semi-submerged catamaran is characterized by having a blade propeller supported by a nearly horizontal rotating shaft installed on the side surface of the center of the submerged body. Water catamaran.