JP3062182B1 - Sponson for planing high-speed boat - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To provide only a part of a spray because an elongated lower surface along a ship side has a flat shape, and to use the kinetic energy to fly the spray in a lateral direction and an upward direction. Could not be utilized. SOLUTION: This is a sponson 11 installed on the sideboard side shell 7 of the stern part 2 of the planing type high speed boat 1 and its axial direction is directed to the front and rear direction of the ship, and jumps up along the bottom surface 3a. This is a planing-type high-speed boat provided with a sponson 11 having a tunnel-shaped recess 13 extending in an axial direction and opened substantially in an inclined direction or a water surface direction of a ship bottom surface 3a so as to capture sprayed water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sponson for improving the hull attitude stabilizing performance of a planing type high speed boat at high speed.

[0002]

2. Description of the Related Art Generally, a planing type high speed boat has a property that its running attitude is greatly changed by a slight disturbance. Further, even when there is no disturbance, a periodic motion in the vertical direction called poppoising may occur. Sponsons are provided on the stern side in order to suppress these changes in the hull attitude and hull movement (for example, Japanese Patent Application Laid-Open No. Hei 6-191466 and Japanese Utility Model Application Laid-Open No. 62-157694).

[0003] Such a sponson receives near the rear end of a hull a spray flowing from the bottom of the hull along the surface of the hull to generate a fluid force, which is used to stably maintain the attitude of the hull. It is.

[0004]

However, the above-mentioned conventional sponson has a flat plate shape and an elongated lower surface along the ship side has a flat shape, so that only a part of the spray can be received. Most of its kinetic energy was discarded in order to escape laterally and upwards.

Accordingly, it is not possible to obtain sufficient fluid force (lift) necessary for maintaining a stable hull attitude, or to increase the length and width of the sponsons in order to generate sufficient fluid force (lift). And the resulting increase in drag on the hull.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is provided on a ship-side outer plate at the stern of a planing type high-speed boat, and the axial direction thereof is set in the front-rear direction of the ship. a sponson that is, has a tunnel-like recess extending in the axial direction which opens in the inclined direction or the water surface direction of Ryakusen bottom so that it can capture the spray has jumped along the ship's bottom, moreover, the front portion of the sponson In the tunnel
The spray trapped in the recess serves as a damming wall.
At the rear end of the sponson
Is a sponson for a planing type high-speed boat in which a tunnel-shaped concave portion is opened rearward .

[0007] Thus, most of the spray flowing upward and rearward along the bottom surface of the ship is captured and received by the sponge-son tunnel-shaped concave portion, and most of the kinetic energy can be effectively used as lift and thrust. That is, while the conventional Sponson escapes the spray in the lateral direction, by flowing the spray toward the rear of the hull (directly behind), a forward fluid force (ie, thrust) is applied to the Sponson as a reaction force.
Can be obtained. Also, while the conventional sponsons let the spray escape above the boat, by flowing the sprays below the hull, the sponsons can obtain a hull upward force (that is, lift) as a reaction force.

[0008] With these lifts and thrusts, the stability of the hull attitude and the propulsion performance can be improved as compared with a conventional high-speed boat equipped with sponsons.

In addition, a step portion is formed as a damming wall for the spray trapped in the tunnel-shaped recess at the front of the sponson, and the tunnel-shaped recess is opened rearward at the rear end of the sponson . the step portion of this, among the spray trapped in the tunnel-shaped recess, a portion of the spray dammed flowing back forward without flowing backward, the kinetic energy in the forward direction of the spray is received, the other Most of the spray is directed rearward along the tunnel-like recess and is discharged from its open end rearward along the hull sideboard to provide thrust.

When the ceiling surface of the sponson forming the tunnel-shaped recess is inclined downward rearward at the rear end of the sponson, the spray captured by the tunnel-shaped recess is inclined obliquely downward at the rear end. Lift is increased by being released. This contributes to the improvement of the attitude stability performance of the high-speed boat.

Further, when the sponge is formed to have a substantially hook-shaped cross section and a hook portion is formed at the tip, the spray that has risen from the ship bottom can be efficiently taken into the tunnel-shaped concave portion without escape.

Further, when the sponsons are arranged so as to have an upward angle of attack, the tunnel-shaped concave portion has good catching properties against the spray during high-speed running, and at the same time, the spray can be discharged further downward, so that the lift is increased. growing.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 (a) and 1 (b) are a side view and a front view as seen from the stern of a planing type high speed boat provided with a sponson according to the present invention.

The planing high-speed boat 1 shown in FIG. 1 is a small personal watercraft for leisure. The jet boat 4 provided near the bottom 3 of the stern 2 jets water to obtain propulsion and to sail at high speed. It is something that runs. The driver controls the steering wheel 6 while sitting on the seat 5. The hull cross section is symmetrical with respect to the hull center line, and the bottom 3 is a keel 3b.
It extends upward from the position to the side of the ship 7a and rises almost vertically upward from the knuckle line 8k to form the ship side outer plate 7. The knuckle line 8k forms the chines 8, and the hull outer plate 7 existing between the chines 8 and the deck 9 has a certain depth (height) from the stern, and the chines 8 are substantially parallel to the deck 9. Extends to near the bow 10
Draw a gentle arc from the vicinity of the bow 10 and make the bow end 10a
Is connected to

An elongated sponson 1 extending in the longitudinal direction of a boat
1 is attached to the stern side outer panel 7 of the stern 2. The sponsons 11 are arranged at symmetric positions on both sides.

FIGS. 2A and 2B are an enlarged plan view and a side view of the sponson 11, and FIG. 3 is a sectional view taken along the line XX in FIG. 2B.

The head (front portion) 12 of the sponson 11 has a streamlined shape, and has a fixed width and height substantially parallel to the ship side outer plate 7 with its axial direction oriented in the longitudinal direction of the boat. is there.

The sponson 11 is usually formed in a hook-shaped cross section, as shown in FIG. That is,
The tunnel-shaped recess 13 engraved in the sponson 11 extends in the axial direction, and a step portion 14 is formed near the end of the front streamline, so that the spray flowing into the tunnel-shaped recess 13 does not flow backward but flows forward. It works as a wall that blocks some of the spray flowing backward (a wall that receives the kinetic energy of the spray in the forward direction). At the rear end of the sponson 11, the tunnel-shaped recess 13 is open to the rear of the stern.

As shown in FIG.
Is opened in the water surface direction, more preferably substantially toward the ship bottom surface 3a, so that the spray S that has jumped obliquely along the ship bottom surface 3a can be efficiently taken in (captured). Therefore, the spray S jumping up along the ship bottom surface 3a is caught in the tunnel-shaped recess 13, and the spray S flows rearward along the tunnel-shaped recess 13 so that the spray is discharged rearward from the rear end 11b. I have.

The inner wall 13a forming the tunnel-shaped recess 13 is formed in a substantially elliptical curved surface, and its free end has the shape of a hook 11a. In other words, the free end of the sponson 11 has a shape (hook shape) that catches the bundle (spray group) of the spray S that has jumped up from the bottom of the ship and does not allow it to escape.

Further, the inner wall (ceiling wall portion) 13a forming the tunnel-shaped recess 13 is gently inclined downward at the rear of the sponson 11. 3 indicates the position of the inner wall at the rear end position of the sponson 11. The amount of downward inclination at the rear end position is δ (see FIG. 2).
(b)). The reason why the tunnel-shaped concave portion 13 is inclined downward at the rear portion is to increase the lift as much as possible, as described later.

FIG. 4 shows another example of the cross-sectional shape of the sponson 11A, in which the tunnel-shaped recess 13A is formed in a semicircular curved surface to simplify the structure to simplify the manufacturing. is there. Also in this case, the tunnel-shaped recess 1
The opening 3A is open toward the water surface or the ship bottom 3a, so that the spray S group can be easily captured. The same components as those in FIG. 3 are denoted by the same reference numerals, and description thereof will be omitted.

The standard arrangement of the sponsons 11 (hereinafter referred to as "reference position") is as follows. (a) Position of the boat in the front-rear direction: The boat is positioned so that the rear end 11b of the sponson 11 is near the stern end. (b) Arrangement of the boat in the height direction: the spray that has jumped up obliquely along the bottom of the boat so that the hook 11a of the sponson 11 is located substantially at the height of the chines 8 near the stern. It is arranged at such a height that the tunnel-shaped recess 13 is positioned so as to be captured (sucked) by the tunnel-shaped recess 13. (c) The angle of attack θ of the sponson 11: The sponson 11 is arranged parallel to the chines 8. (It is assumed that this position is the reference of the angle of attack = 0 °.) According to the experimental results described later, it is preferable that the sponsons are inclined at an angle of attack θ of about 3 ° so that the front end is upward (FIG. 2 (b)).

By arranging the sponson 11 at the reference position, the functions shown in FIGS. 5A and 5B are exhibited. That is, FIGS. 5 (a) and 5 (b) are a plan view and a side view of a planing type high speed boat showing the operation of the present invention.

While traveling at high speed, the spray S jumping up from the bottom of the ship is
(See FIG. 3), the water is guided rearward along the tunnel-shaped recess 13, that is, along the ship side, and is discharged slightly downward from the rear end. At this time, an upward force acts on the sponson 11.

FIG. 5 (a) shows the thrust increase obtained by setting the spray discharge direction to the rear along the ship side, that is,
It is a figure for explaining resistance reduction.

[0027] indicates the direction of spraying by a conventional sponson, with most of the spray dissipating diagonally rearward from the stern without being captured by the sponson. In the present invention, most of the spray is discharged straight back along the ship side.
Therefore, the difference from the magnitude of the component in the direction is the thrust applied to the sponson, that is, the resistance reduction amount.

FIG. 5 (b) is a diagram for explaining the lift increase obtained by discharging the spray obliquely downward.

Conventionally, the spray is dissipated with a slightly upward component, but in the present invention, the dispensed is slightly obliquely downward. At this time, the upward component of the parallelogram formed as follows is the amount of lift increase applied to the sponson.

As described above, in the planing high-speed boat equipped with the sponson of the present invention, the kinetic energy of the spray is recovered by the sponson, and is effectively used for increasing the lift and decreasing the resistance.

FIG. 6 is an evaluation diagram of the operation and effect of the conventional type and the present invention obtained by a running experiment with a real boat. The vertical axis indicates the lift, and the horizontal axis indicates the evaluation value of the hull attitude stability performance (specifically, the magnitude of the head-down moment and the magnitude of the popping amplitude). If it rises to the right, it means that the performance is higher than the conventional type as a sponson.

The circles ○ are comparisons between the prior art and the present invention when the sponson is provided at the reference position. When provided at the reference position, the difference in performance between the conventional and the present invention is the largest.

The diamond ◆ ◇ indicates a conventional case and the present invention when the sponson is arranged with the front end of the sponson inclined at an angle of 3 degrees upward from the reference position (that is, when the angle of attack θ = 3 °). It is a comparison. The conventional type and the present invention both have a large lift and the most excellent posture stability performance as compared with the case where they are arranged at the reference position. Therefore, it was found that it is more preferable to mount the sponson with the head raised by about 3 °.

The square mark ■ indicates a comparison between the conventional type and the present invention in which the sponson is provided at a position 30 mm forward from the reference position, and the triangle mark 位置 indicates that the sponson is positioned 20 mm above the reference position. This is a comparison between the conventional type and the present invention in the case where they are provided.

Considering from FIG. 6, it can be seen that when the sponsons are provided at the front position from the reference position or at the upper positions, the performance is lower than at other positions. This is because the spray from the ship bottom cannot be sufficiently captured. However, it can be seen that the sponson of the present invention, even when provided at the upper position or the front position, shows superior performance to that of the conventional sponson at the reference position and at the position where the tip is raised by 3 °.

[0036]

The present invention is embodied in the form described above and has the following effects. The kinetic energy can be effectively used as lift and thrust by effectively trapping most of the spray flowing upward and backward along the bottom surface of the ship with the tunnel-shaped recess. That is, while the conventional sponson escapes the spray in the lateral direction, by flowing the spray backward (directly behind), the sponson can obtain a forward fluid force (i.e., thrust) as a reaction force.

In particular, among the sprays trapped in the tunnel-shaped recess, a part of the spray that flows backward without flowing backward is blocked by the step portion, and kinetic energy of the spray in the forward direction is received. Many other sprays are channeled rearward along the tunnel-like recess and are discharged from their open ends rearward along the hull skin, thereby providing thrust.

In contrast to the conventional sponsons that let the spray escape above the hull, by flowing the sprays below the hull, an upward force (ie, lift) on the hull can be obtained as a reaction force to the sponsons. Due to the increase in lift and thrust (ie, decrease in drag), the stability of the hull attitude can be improved as compared with a conventional high-speed boat equipped with sponsons,
Propulsion performance can also be improved.

[Brief description of the drawings]

FIG. 1 shows a planing type high speed boat provided with a sponson according to the present invention, wherein (a) is a side view, and (b) is a front view of a main part viewed from the rear of the stern.

FIGS. 2A and 2B are a plan view and a side view of a sponson, respectively.

FIG. 3 is a cross-sectional view of the Sponson taken along the line XX in FIG. 2 (b).

FIG. 4 is another longitudinal sectional view of Sponson.

5A and 5B are action diagrams of Sponson, wherein FIG. 5A is a plan view and FIG. 5B is a side view.

FIG. 6 is a diagram illustrating test results of a real boat.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Planing type high speed boat 2 ... Stern (end) part 3 ... Ship bottom 3a ... Ship bottom 7 ... Ship side shell plate 8 ... Chine 9 ... Decks 10 ... Forehead part 11, 11A ... Sponson 11a ... Hook part 11b ... Sponson rear end 12 ... Sponson's head (front part) 13, 13A ... Tunnel-shaped recess 13a ... Inner wall (ceiling wall) 14 ... Step part S ... Spray

Continuation of the front page (56) References JP-A-6-321172 (JP, A) JP-A-62-34897 (JP, A) JP-A-61-13191 (JP, U) (58) Fields investigated (Int .Cl. ⁷ , DB name) B63B 1/18 B63B 35/73

Claims (5)

(57) [Claims] 1. A sponson installed on a hull-side outer plate of a stern of a planing type high-speed boat and having its axial direction directed in the front-rear direction of the ship, and catches a spray that jumps up along the bottom of the ship. In order to be able to do so, there is a tunnel-shaped recess extending substantially in the direction of inclination of the bottom of the ship or in the direction of the water surface , and a tunnel-shaped recess at the front of the sponson.
Step as a damming wall for spray trapped inside
And a sponge at the rear end
A sponson for planing high-speed boats with a tunnel-shaped recess opened to the rear . 2. The sponson for a planing type high-speed boat according to claim 1 , wherein a ceiling surface of the sponson forming the tunnel-shaped concave portion is inclined downward rearward at a rear end of the sponson. 3. The sponge according to claim 1, wherein a hook portion is formed at a tip portion by forming the sponson into a substantially hook-shaped cross section.
Sponson for high speed boats on board . 4. The sponson for a planing type high speed boat according to any one of claims 1 to 3 , wherein the sponson is inclinedly arranged so as to have an upward angle of attack. 5. A planing type high speed boat provided with the sponson according to any one of claims 1 to 4 .