JPS5915751Y2 - semi-submerged catamaran - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a semi-submerged catamaran in which a single upper hull above the water surface and a pair of left and right lower hulls below the water surface are connected by left and right struts.

Conventional semi-submerged catamarans include those shown in Figures 1 to 3. Figure 1 is a side view of the hull, Figure 2 is a front view of the hull, and Figure 3 is a view of the stern of Figure 1. It is an enlarged view of a part,
In the figure, numeral 1 is the upper hull, 2a and 2b are the struts, 3a and 3
b is the lower hull, 4a is the propeller, 5a is the rudder, 6 is the baseline, 7 is the planned waterline, 8 is the front perpendicular line, 9 is the rear perpendicular line, 10 is the hull superstructure, 11 a, 11 b are the engine room, 12a and 12b are engines, 13a is a propeller shaft,
14a is a steering gear, and 15a is a rudder shaft.

Note that the subscript a in each code indicates the starboard side, and b indicates the port side, but the propeller 4b, rudder 5b, and shaft 1 on the port side
3b, the steering gear 14b, and the rudder shaft 15b are not shown.

By the way, in the conventional semi-submerged catamaran as mentioned above, the first
As is clear from the figures and FIG. 3, rudders 5a, 5b are provided behind propellers 4a, 4b.

For this reason, the struts 2a and 2b are extended rearward to above the rudder, but this results in an increase in the water line area, an increase in weight, and an increase in frictional resistance due to an increase in the flooded area.

Therefore, it can be seen that if these can be reduced, it will be advantageous as a semi-submerged catamaran.

SUMMARY OF THE INVENTION The object of the present invention is to provide a semi-submerged catamaran with improved performance by eliminating the above-mentioned disadvantages associated with arranging the rudder behind the propeller.

For this reason, the semi-submerged catamaran of the present invention has an upper hull above the water surface, right and left columns that extend downward from the upper hull through the water surface, and a column that is attached to the lower end of each column and is located below the water surface. In a semi-submerged catamaran equipped with a pair of left and right lower hulls located at the lower hull, the lower end of the stern rudder is located above the upper end of the propeller provided at the rear end of the lower hull, and
It is characterized in that an air suction prevention plate is disposed between the lower end of the rudder and the upper end of the propeller.

In other words, the semi-submersible catamaran of the present invention has the advantage that by pulling the rudder above the propeller, the rudder can be moved forward, thereby eliminating the need to extend the rear end of the prop to the rear. There is.

In addition, the lower end of the rudder is located above the upper end of the propeller, and an air suction prevention plate is inserted between the lower end of the upper rudder and the upper end of the lower propeller, so that turbulence in the water flow caused by steering does not affect the propeller. There is also the advantage of being able to prevent damage from occurring.

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 of the stern section thereof, and Fig. 5 is a sectional view taken along arrows 4 - V (port side hull). In Figures 4 and 5, the same reference numerals as in Figures 1 to 3 indicate almost the same parts, and new reference numerals 1
6a shows the air suction prevention plate on the starboard side.

The air suction prevention plate 16b on the port side is not shown.

The semi-submerged catamaran of this embodiment, like the conventional one, has an upper hull 1 above the water surface and a pair of left and right lower hulls 3a and 3b located below the water surface. The snakes 5a, 5b are connected by struts 2a, 2b, but as shown in FIG. Air suction prevention plates 16a and 16b are provided between the lower ends of the snakes 5a and 5b.

As a result of the above configuration, the rear perpendicular line 9 is connected to the propeller 4a.
, 4b can be placed in front of the pillar 2.
The rear ends of a and 2b are connected to the propeller 4a.

Since it is no longer necessary to extend further aft than 4b, frictional resistance is reduced due to a reduction in water line area, a reduction in ship weight, and a reduction in submerged area.

These are all factors that improve the performance of a semi-submerged catamaran, so by applying the present invention, a semi-submerged catamaran with significantly improved performance can be obtained.

Further, since the lower end of the snake 5a is located above the upper end of the propeller 4a, it becomes possible to provide the snake 5a directly above the propeller 4a.

As a result, the wake of the snake 5a is less likely to flow into the propeller 4a, and the adverse effect on the propeller 4a of the turbulence of water flow caused by steering can be reduced.

Further, the lower ends of the snakes 5a and 5b are connected to the propeller 4a.

Since the air suction prevention plates 16a and 16b are inserted between the upper ends of the propellers 4b and 4b, even if the water flow is disturbed due to steering, there will be no adverse effect on the propeller.

[Brief explanation of the drawing]

Figures 1 to 3 show a conventional semi-submerged catamaran. Figure 1 is a side view of the hull, Figure 2 is a front view of the hull, and Figure 3 is an enlarged view of the stern of Figure 1. Figures 4 and 5 show a semi-submerged catamaran as an embodiment of the present invention. Figure 4 is a side view of the stern, and Figure 5 is a view of the V-■ arrow in Figure 4. FIG. 2 is a cross-sectional view of the starboard hull along the line of sight. 1... Upper hull, 2a... Starboard side support, 3a... Lower hull on starboard side, 4a...
... Starboard side propeller, 5a... Rudder, 6...
...Baseline, 7...Planned waterline, 8.
...Front perpendicular line, 9...Rear perpendicular line, 13a
・・・・・・Starboard side propeller shaft, 14a・・・・・・
・Starboard side steering gear, 15a...Starboard side rudder shaft, 16a...Starboard side air suction prevention plate.

Claims (1)

[Scope of utility model registration request] A half body comprising an upper hull above the water surface, left and right struts extending downward from the upper hull through the water surface, and a pair of left and right lower hulls attached to the lower ends of each strut and located below the water surface. In a submerged catamaran, the lower end of the stern rudder is arranged above the upper end of the propeller provided at the rear end of the lower hull, and an air suction prevention plate is provided between the lower end of the rudder and the upper end of the propeller. A semi-submersible catamaran characterized by the fact that it is equipped with.