JPS6198689A - Compact ship - Google Patents

Abstract

PURPOSE:To generate a lift in the stern, increase the propeller propulsion efficiency, and enable stable navigation by forming a recessed location in the forward and backward direction at the central part of a ship's bottom, providing a rudder at its rear end, and arranging a lift plate and a propeller in the front. CONSTITUTION:A recessed location 12 is formed over the forward and backward direction at the central part in the width direction of a ship's bottom 11. A rubber 13 is provided at the rear end of the recessed location 12 and a lift plate 14 and a propeller 15 are arranged in front of the rudder 13 and in front of the lifting plate 14, respectively. As a result, the water guided by the propeller 15 is commutated by the recessed location 12 and the propulsion efficiency of the propeller 15 is improved. In addition, by providing the lift plate 14 at the rear of the propeller 15, a lift is generated in the stern, the rise of the stem section is prevented, and then stable high speed navigation is enabled.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to small vessels, particularly small vessels such as shared fishing boats, passenger boats, pleasure boats, etc., for transporting many people quickly and safely.

(Prior Art) From ancient times to the present, many experiments and studies have been conducted in order to obtain ships that can sail quickly and safely. Generally, a ship running on the water surface is subjected to three types of resistance: frictional resistance due to water, wave resistance, and eddy resistance. In order to eliminate these three resistances and to enable safe and comfortable navigation, improvements are being made day by day, but ironically, even after solving the problems, It is a phenomenon observed at the stage of ship development that gives rise to other new problems.

For example, in the case of catamarans, it was possible to significantly eliminate wave resistance and vortex resistance by making them catamarans, but a large amount of steel was required to make the structure of the hull itself strong. However, due to the increase in steel, the power engines that propelled ships had to be made larger, and at the same time, the capacity of the fuel tanks also increased, causing problems one after another.
Eventually, the speed of this catamaran would decrease.

In addition, small boats called hydroplanes can run on the water surface like skis, which eliminates most of the resistance such as wave resistance and allows them to achieve considerable speed. However, when sailing at high speeds, the bow began to move violently up and down. This phenomenon is a fast pitching movement centered on the stern, and when this phenomenon occurs, it can cause serious problems such as the hull becoming unstable and capsizing, or the bow thrusting into the water, causing a large accident. There is a possibility that this will occur.

Concerned about this reality, the inventor suspected that conventional shipbuilding technology lacked some decisive perspective, and as a result of intensive research, he found that, especially for small ships,
While the ship was sailing at high speed, the bow floated in a state of >Q, but we concluded that it would be better from the standpoint of high-speed performance and safety if the ship's hull remained approximately parallel to the water surface at any speed. Obtained.

(Problems to be solved by the invention) The present invention has been made based on the following two ideas, and the problems to be solved by the invention are as follows: To provide a small vessel with a relatively simple structure, excellent safety, and capable of stable navigation even at high speeds (Means for solving the problems) To solve the above problems. To this end, the measures adopted by the present invention are to separate the center of buoyancy to the left and right sides of the hull by forming a recess extending in the longitudinal direction in the center of the bottom of the ship, and to provide a rudder at the rear end of this recess. This small boat is characterized in that a lift plate is provided in front of the lift plate to generate a lift force to raise the stern in a negative direction, and a propeller is disposed in front of the lift plate or near the front of the lift plate and in the recess. In other words, by installing a lift plate on the stern side that generates upward lift according to the sailing speed and raising the stern by -1-, in other words, by preventing the bow from leaving the water surface, the hull is raised above the water surface. It is a small vessel that can always navigate horizontally.

First, the present invention will be explained according to specific examples shown in the drawings.

In FIG. 1, a side view of a small boat (Io) according to the present invention is shown with the bottom (11) cut away, and the center of the bottom (1]) of the small boat (10) is shown. A recess (12) is formed in the section from the bow side to the stern side. In other words, in the small boat (10), its bottom (11
) by forming a recess (12) in the front-rear direction,
The buoyant force applied to the small boat (10) is distributed to the left and right, and the bottom (11) is a semi-catamaran. This recess (12) is
1.7 The bow may be exposed above the water.
, or may be submerged in water. The rear portion of this recess (12) is swollen toward the rear so as to serve as a storage section (12a) for storing a propeller (15), which will be described later. This allows the propeller (15
) will be located above the lowest end of the bottom (11), as shown in FIG.

A rudder (13) is provided at the rear end of this recess (12),
Immediately before this rudder (13), a lifting plate (14) is placed on the bottom of the ship [11].
). This lifting plate (14)
As shown in the drawings and FIG. 3, it has a shape that is slightly curved upward and has a roughly central portion swollen relative to the other portions, that is, a shape similar to the wing of an airplane. As a result, when the lift plate (14) moves underwater in the direction of the arrow shown in FIG. 2, it generates a lifting force in an upward direction as shown in the figure. Note that this lifting plate (14) is attached to the bottom (11) of the small boat (10) by its flange portion C14a).

Further, FIG. 4 shows a lifting member (24) which is another embodiment of this lifting plate (14). This lifting member (2
4) is a re-flange part (24a) for fixing it to the bottom (11) side, a bearing (24b) that supports the rotating shaft of the propeller (15), and these flange parts (24a).
) and a pair of lifting plates (24c) located between the d111 bridge (24b). Of course, the lift plate (24c)
The lift plate (14) also has a similar shape to the above-mentioned lift plate (14) and generates lift. When this lifting member (24) is used, the propeller (15) rotates near the front of the lifting plate (24c).

Note that in Example 1, the propeller (15) is supported by a support, but as shown in Fig. 5, a pair of propellers (15) are mounted on a pair of shafts that rotate in opposite directions. Each may be fixed and implemented. In addition, the said small vessel (
If 10) is to be used in a relatively deep sea, a large diameter propeller may be used as shown in FIG.

(Function) Next, the function of the small boat (1o) configured as described below will be explained. In this small boat (1o), by providing a recess (12) in the front-rear direction of the bottom (11), the buoyancy is distributed laterally. As a result, this small boat (10) has the advantages of a Waha semi-catamaran (catamaran) and is extremely stable.

This is a very important advantage in a small fishing boat where various fishing gear must be loaded onto the small boat (10).

Furthermore, by storing the propeller (15) in the recess (12), the water will flow along the recess (12), so the two will work together like a duct propeller. Become. In other words, the vortex resistance around the propeller (15) is reduced, the winding around the propeller (15) is relatively stable, and the propulsion efficiency of the propeller (15) is increased.

Furthermore, as the small vessel (10) moves forward, the lifting plate (14) or the lifting plate (24) of the lifting member (24)
At 4c) an upward lift force is generated. This results in
Since the stern of the small boat (10) is lifted, the bow does not leave the water surface. In this case, a small vessel (10
) increases, the lift force exerted by the propeller (15) also increases, so this lift force cancels out the increase in the force exerted on the bow due to the increase in speed. In other words, the portion of the small boat (10) that is submerged in water during navigation remains constant regardless of changes in the navigation speed. As is generally known, the following Froude number (FR
OUDE NUMBER) General formula Fn: Froude number g According to the double force acceleration, if ships of different lengths run with the same width and depth,
The longer the ship, the faster the speed. Therefore, since the small boat (10) according to the present invention has its bow always underwater, its speed is faster than a boat that navigates with its bow raised.

As shown in Fig. 1, if the lower end of the propeller (15) is located on three sides of the ship's bottom (11), this small boat (10) can operate the propeller (15) even in a relatively shallow place. 15) can be navigated without causing damage to the vessel.

(Effect of the invention) Therefore, the small vessel (10) configured as in the previous ν can sail in a stable state no matter what the cargo condition of the small vessel (10) l is. can. In addition, the propeller (15) is made into a duct propeller-like state to increase the propulsion efficiency of the propeller (15), and the action of the lifting plate (14) or the lifting member (24) makes it possible for the small boat (10) to constantly move. Since the small boat (10) can sail in a horizontal state, the sailing speed of the small boat (10) can be increased more than before. Furthermore, as mentioned above, the small vessel (10) can always navigate in a horizontal state, so even when sailing at high speed, the bow does not move violently up and down, and it is in an extremely stable state. And it can be navigated safely.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of a small boat according to the present invention, and FIG.
The figure is an enlarged side view of the line II-II in Figure 1, Figure 3 is a perspective view of the lifting plate, Figure 4 is a perspective view showing a lifting member which is another embodiment of the lifting plate, and Figure 5 is a perspective view of the lifting member as another embodiment of the lifting plate. FIG. 6 is an enlarged view showing another embodiment corresponding to FIG. 5. Explanation of symbols 10... Small ship, 11... Bottom, 12... Recess, 13... Rudder, 14... Lifting plate, 15... Propeller, 24... Lifting member .

Claims (1)

[Claims] By forming a recess extending in the longitudinal direction in the center of the bottom of the ship, the center of buoyancy is separated to the left and right sides of the hull, and a rudder is provided at the rear end of this recess, and the lifting force to raise the stern is applied to the front of the rudder. 1. A small boat, comprising: a lift plate that generates lift; and a propeller disposed in front of or near the front of the lift plate and within the recess.