JP2594845Y2 - Planing high-speed boat - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planing type high-speed boat provided with a bilge keel as a hull roll suppressing means at the bottom of the boat.

[0002]

2. Description of the Related Art High-speed boats, which have become remarkably popular as marine leisure boats, are of the planing type in which the bow is raised and run on the water surface, and V-shaped boats occupy the mainstream. The V-bottom planing type high-speed boat, even when jumping in large waves and falling to the water surface, has a cushion stroke effect of the V-bottom, so that the impact with the water surface is alleviated and the riding comfort is excellent. In addition, many high-speed boats of this type are designed to raise the bow side of the hull about 2/3 of the total length of the hull from the water surface during high-speed navigation, thereby reducing the frictional resistance between the hull and water during navigation and improving straight-line navigation performance. Has been made.

[0003]

The planing type high-speed boat has a poor balance in the lateral direction due to the V-shaped bottom, so that it cannot skid smoothly due to skidding at the time of turning, and there is a danger of overturning and overturning at a sharp turn. There was a big problem. For example, when a high-speed boat turns to the left, the hull turns while leaning to the port side. At this time, the water current lifts the starboard side of the V-shaped bottom and slides the port side to the starboard side. With this effect, the stern side of the hull turning to the left skids to the starboard side,
If you make it worse, the hull may tip over greatly and overturn.

There is a high-speed boat in which a bilge keel projects diagonally downward on the port and starboard sides of the V-shaped bottom for the purpose of suppressing the sideslip and rollover of the hull during turning. The bilge keel of this high-speed boat has a certain effect in that when the hull rolls, the resistance to water increases, suppressing the hull from rolling, and suppressing the skidding and rollover of the hull when turning. However, the bilge keel that protrudes from the bottom of the hull, when the hull jumps in the waves and falls to the surface of the water, the water stream collides strongly between the bilge keel and the bottom of the hull, increasing the shock when the hull falls and increasing the speed of the boat. Make you feel uncomfortable. Conversely, in order to improve the ride comfort of high-speed boats, shorten the length of the bilge keel from the bottom of the boat and reduce the impact with water when the hull falls, the resistance to water when the hull rolls down, The bilge keel's hull roll suppression effect is reduced, and the hull sideslip and rollover rollover suppression effects during turning are almost eliminated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a high-speed boat equipped with a bilge keel which has a high effect of suppressing skidding and rollover at the time of turning a hull without impairing ride comfort during navigation. With the goal.

[0006]

According to the present invention, a pair of flat bilge keels are mounted on a starboard side and a port side of a stern bottom so as to be inclined toward a center of gravity of a hull and face each other in a C-shape. This object is achieved, in particular, by mounting the bilge keel in a position always underwater and extending only from the stern to the rear.

[0007]

[0008]

According to the above configuration, the hull is constantly suppressed from high speed to low speed navigation, side slip during turning is also suppressed, and overturning due to rollover is effectively prevented, and safety during turning of a high speed boat is ensured. Can be further improved. And
Since the bilge keel only extends rearward from the stern, there is a space between the pair of bilge keels to allow the water flow to escape up and down, so that when the hull moves while jumping, the bow is prevented from rising too much, and It can function as a shock absorber that alleviates the impact when falling down, and can realize smooth cushion stroke navigation in the waves of high-speed boats safely and comfortably, improving ride comfort. There are advantages that can be done. In particular, since the bilge keel is located at a position far from the center of gravity, even a small-sized one can exert its effect sufficiently by the principle of leverage.

[0009]

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment will be described with reference to FIGS.

A high-speed boat according to a first embodiment shown in FIG. 1 has a pair of bilge keels 3a on a V-shaped bottom 2 of a stern 1b of a hull 1.
The tip of 3b is fixed. Each bilge keel 3a, 3
b is a flat plate extending substantially rearward from the stern 1b in a direction substantially parallel to the longitudinal direction of the hull 1, and as shown in FIG.
The width direction is opposed to the center of gravity W of the hull 1 in a C-shape. Each bilge keel 3a, 3b has an inclination angle θ of about 40 °, and is installed at a position symmetrical to the starboard and port side of the bottom 2 of the ship. The tip of each bilge keel 3a, 3b is detachably fixed to the ship bottom 2 via a simple mounting member 4. The bilge keels 3a and 3b have a structure in which a lightweight and strong metal base material such as an aluminum alloy or stainless steel is coated with a reinforced plastic for corrosion prevention, so that the water resistance of the hull 1 when traveling straight is reduced. Has a streamlined outer shape.

As shown in FIG. 2, when a high-speed boat is navigating at high speed, the hull 1 rises from the bow 1a to about 2/3 of the entire length L of the hull from the water surface 5 and travels straight or turns, and the bilge keel 3a, 3b is always below the surface of the water. The frictional resistance between the bilge keels 3a and 3b and the water flow when the hull 1 goes straight ahead is small, and the bilge keels 3a and 3b do not hinder the hull 1 going straight ahead. When the hull 1 turns, the bilge keels 3a and 3b effectively suppress the sideslip and rollover of the hull 1. For example, as shown in FIG. 3, when the hull 1 turns to the left, the hull 1 leans to the left. At this time, the water flow acts on the upper surface of the bilge keel 3a on the starboard side in a direction to push down the bilge keel 3a, while the port side The water flow acts on the lower surface of the bilge keel 3b to push up the bilge keel 3b. As a result, the inclination of the hull 1 is suppressed, and the sideslip of the hull 1 is suppressed together with the sinking of the hull 1, and the hull 1 turns smoothly to the left with little risk of overturning. Hull 1 when turning
Is performed around the center of gravity W of the hull 1, the pair of bilge keels 3 inclined toward the center of gravity W of the hull 1.
The a and b swing around the center of gravity W with the water resistance maximized in the water, so that the bilge keels 3a and 3b effectively suppress the hull roll.

When the hull 1 sails in the waves, jumps and falls to the water surface 5, the impact of the cushion stroke by the V-shaped bottom 2 and the impact of the water resistance of the bilge keels 3a, 3b when the hull 1 falls is provided. Is alleviated. That is, as shown in FIG. 4, when the hull 1 falls, the bilge keel 3a,
The water flow acts on the lower surface of 3b to push up the bilge keels 3a, 3b, thereby alleviating the strong collision of the bottom of the stern 1b of the hull 1 with the water surface 5. This bilge keel 3a, 3
Since b is behind the stern 1b, the effect of the cushion stroke of the V-shaped bottom 2 when the hull falls is not impaired. Therefore, even when the hull 1 jumps on the water surface 5, the hull 1 smoothly falls on the water surface 5 with little impact.

The bilge keels 3a and 3b are:
The bilge keels 3a and 3b may be shaped like wings that are long in the width direction of the hull 1, although the strips are described as being long in the length direction of the hull 1.

[0015]

[0016]

[0017]

Although the first embodiment has been described for a high-speed boat with a V-shaped bottom, the present invention can be applied to a round high-speed boat or the like in the same manner as described above.

[0019]

[Effects of the Invention] The present invention has the above-described structure, and has the following effects.

In the high-speed boat according to the first aspect of the present invention, the roll of the hull is constantly suppressed from high-speed cruising to low-speed cruising, side slip during turning is suppressed, and overturning due to rollover is effectively prevented. Safety during turning can be further improved. And since the bilge keel only extends rearward from the stern, there is a space between the pair of bilge keels to allow the water flow to escape up and down, and when the hull traverses while jumping, the bow is suppressed from rising too much, and , Which can act as a shock absorber to reduce the impact when falling on the water surface, and can realize smooth cushion stroke navigation in the waves of a high-speed boat safely and comfortably, improving ride comfort. There are advantages that can be. In particular, since the bilge keel is located at a position far from the center of gravity, even a small-sized one can exert its effect sufficiently by the principle of leverage.

[0021]

[Brief description of the drawings]

FIG. 1 is a view showing a first embodiment of the present invention, wherein (a) is a side view, (b) is a bottom view, and (c) is a rear view.

FIG. 2 is a side view of the hull at the time of high-speed navigation.

FIG. 3 is a rear view of the hull when turning.

FIG. 4 is a rear view of the hull when it falls.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hull 1b Stern 2 Ship bottom 3a Bilge keel 3b Bilge keel

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B63B 3/44 B63B 1/18 B63B 39/06

Claims (1)

(57) [Scope of request for utility model registration] 1. A pair of flat bilge keels are mounted on a starboard side and a port side of a stern bottom in a state of being inclined toward substantially the center of gravity of a hull and facing each other in a C-shape. A planing type high-speed boat characterized in that it is mounted at the position described in the above section and is extended only rearward from the stern.