JPH0541118Y2 - - Google Patents

Description

[Detailed explanation of the idea] Technical field The present invention relates to a small personal watercraft.

Background technology The hull shape, which is the shape of the hull, is
For example, there are round bottom types and square bottom types. It is desirable for a small personal watercraft to be able to travel straight without meandering and to be resistant to skidding.

Problems to be Solved by the Invention The purpose of the invention is to provide a small personal watercraft that has good straightness and is less likely to skid.

Means for Solving the Problems The present invention has a hull 30 which has a box-like overall shape and a wide shape, and a stern 40 of the hull 30 has a jet propulsion device installed in the widthwise center of the stern 40. In a small personal watercraft that is provided with a nozzle 41 and is maneuvered by angularly displacing the nozzle 41 around the longitudinal axis, (b) grooves 43 and 44 are formed on the left and right sides of the bottom of the boat, respectively, and (c) Outer portions 133, 141 of each groove 43, 44
(d) An outer bottom portion 13 that is inclined upwardly toward the outer side from each of the outer portions 133, 141;
(e) inner bottom portions 138, 14 which are inclined downwardly from the inner side 142, 143 of each groove 43, 44 toward the center along the inner bottom line l;
4 are connected, respectively, and (f) the center of the inner hull bottom portions 138 and 144 is
(g) The top surfaces 134, 145 of the grooves 43, 44 are flat, and the portions 134a, 145a near the stern ends thereof are flat. A gradient α is provided so that it becomes downward toward the rear, and the portions 134a and 145a near the stern end thereof
This is a small personal watercraft characterized by a portion in front of the boat being parallel to the flat bottom portion 139.

Function The small personal watercraft of the present invention has a box-shaped overall shape and a wide hull 30, and a jet propulsion nozzle is installed at the widthwise center of the stern 40 of the hull 30. However, according to the present invention, the bottom of the ship is provided with concave grooves 4 on the left and right, extending from front to back.
3 and 44 are formed respectively, thus the hull 3
It is possible to improve the straight-line performance of the 0 and also to make it difficult to skid. Moreover, according to the present invention, the outer parts 133, 14 of the grooves 43, 44
1 is made to protrude below the extension of the inner hull line l. Therefore, this also makes it difficult to skid.

Furthermore, according to the present invention, the top surfaces 134, 145 of the grooves 43, 44 are flat, and have a slope α such that the portions 134a, 145a near the stern ends become downward toward the rear, The portions forward of the portions 134a, 145a near the stern are parallel to the flat bottom portion 139, and therefore the portions 134a, 145 are sloped at the stern end.
Lift force can be generated at the stern 40.
Therefore, in small personal watercraft that generally tend to cause porpoises, the present invention prevents porpoises from occurring and enables the boat to quickly enter a planing state.

Embodiment FIG. 1 is a perspective view of a small watercraft according to an embodiment of the present invention. The hull 30 of this small personal watercraft consists of a deck 31 and a hull 32 made of, for example, reinforced plastic. A cabin 33 formed by the deck 31 is provided with a driver seat 34 made of urethane foam. This driver seat 34 is located in the front half of the hull 30 and in the center in the left-right direction. A control stick 35 made of, for example, aluminum casting is provided in front of the driver's seat 34 and near the driver's seat 34 . In the driver seat 34,
The backrest portion 36 can be placed in an upright position as shown in the figure, or it can be angularly displaced as shown by an arrow 37 and folded down so that it is flush with the driver's seat 34. The driver's seat 34 is fixed on a cover 39.

A passenger seat 38 is provided behind the driver seat 34 in which two fellow passengers can sit.

The hull 30 has a box-like overall shape, and is shorter and wider in the front and rear (left and right in FIG. 1) than conventional small watercraft of this type, and has a stocky shape. A nozzle 41 for jet propulsion is provided at the stern 40, and this nozzle 41 is connected to the control stick 3.
5 allows the boat to be maneuvered by making an angular displacement around the longitudinal axis. Further, by operating the control stick 35, the opening degree of the throttle valve of the internal combustion engine can be controlled to adjust the propulsive force.

The bottom of the hull 32 is a shallow trimaran, and has grooves 43 and 44 extending back and forth to improve straightness and prevent skidding.

On the deck 31 of the hull 30, the handles 45, 4
6, 47 are provided, and these handles 45, 4
6 and 47 do not protrude outward, so the outer surface of the hull 30 is generally smooth.

By providing the driver's seat 34 in the center of the front half of the hull 30, the driver can sit on the left and right sides 48,
It is almost equidistant from 49.

The control stick 35 is provided in front of the driver's seat 34, and the driver seated on the driver's seat 34
The boat is constructed so that the direction of the bow 50 can be changed by angularly displacing a control stick 35 extending to almost the same height as the upper part of the deck 31 to the left and right with one hand. Therefore, the space required for maneuvering the boat is small.

By folding the backrest part 36 from the upright position as shown by the arrow 37 and placing it flush with the driver's seat 34 on the cover 39, the driver can ride along with the driver's seat 34 and the backrest part 36. It is possible to lie down between the passenger seat 38 and a comfortable posture, and the backrest 36 does not protrude above the hull 30 during packing and transport, making it easy to pack and transport. becomes.

The upper end of the control stick 35 is, for example, slightly higher than the upper surface of the driver's seat 34, and is approximately at the same height as the upper part of the deck 31 of the hull 30.
This will help facilitate the packing and transportation of the small personal watercraft. Cabin 33 of hull 30
Since storage recesses 402 and 403 are provided in a watertight manner, they are useful as storage for small items necessary for boarding.

FIG. 2 is a perspective view of the bottom of the hull 32 of the hull 30. This hull is configured to be horizontally symmetrical, and grooves 43 and 44 are formed on the left and right sides in the front and back. By forming this groove 43,
This makes it possible for the small personal watercraft to travel straight without meandering, and it is possible to improve straight travel performance. Further, by forming the grooves 43 and 44, it is possible to prevent the vehicle from skidding sideways.

The outer chain 133 of the groove 43 projects below the extension of the inner bottom line l, as shown in FIG. From the top surface 134 of the groove 43 to the outer chain 1
33 is formed with a side surface 135 that slopes outward, forming a bottom portion 136 that extends from the outer chain 133 to the outside of the bottom of the boat. A bottom portion 138 is connected to a side portion 137 of the groove 43 near the center. The center of the ship bottom part 138 is the ship bottom flat part 1.
39. The bottom portion 138, the groove 43, and the hull portion 136 form a bottom slope.
The outer chain 133 of the groove 43 is connected to the side surface 13.
5. The bottom portion 136 forms a V-shape in a plane perpendicular to the longitudinal direction of the hull 30.

The configuration in which the outer part of the groove 43 projects downwardly beyond the extension of the inner hull line l is the second
It extends across the front and back of the ship's bottom within the range indicated by reference numeral A in the figure. The other groove 44 is configured in the same manner, and the outer chain 141 of the groove 44 is projected below the extension of the inner hull line.

To further describe the configuration, in the hull 30, outer bottom portions 136, 146 that slope upward toward the outer side extend from the outer portions 133, 141, respectively. Inner part 14 of grooves 43 and 44
2,143, an inner hull portion 138 that slopes downward as it approaches the center along the inner hull line l;
144 are consecutive. This inner bottom part 13
8, 144 forms a bottom flat portion 139 extending back and forth along the grooves 43, 44.

With such a configuration, it is possible to make the small personal watercraft less likely to skid sideways, and therefore less likely to tail slide.

4 is a cross-sectional view of the bottom of the hull 32 near the stern 40.
At the end of the
The angle α is inclined downward toward the rear (left side in FIG. 4), and this inclined portion is indicated by reference numeral 134a. The angle α is, for example, about 2 degrees to 4 degrees.

By providing a sloped portion 134a at the stern end of the top surface 134 of the groove 43,
Lift can be generated at the stern 40. In general, small personal watercraft of this type tend to have a tendency to porpoise due to a combination of factors such as their relatively short overall length and the fact that the center of gravity is located closer to the rear. By configuring the inclined portion 134a as described above, it is possible to prevent porpoise from occurring, and it is possible to enter planing at a low boat speed. To describe the configuration further, the top surfaces 134, 145 of the grooves 43, 44 are flat. Top surface 134,
Parts 134a and 145a near the stern end of 145
has a gradient α that decreases toward the rear. The portions of the top surfaces 134, 145 in front of the portions 134a, 145a near the stern end are parallel to the flat bottom portion 139, as is clear from FIG.

Effects As described above, according to the present invention, it is possible to improve the straightness of traveling without meandering, and it is also effective in preventing skidding. In particular, the hull 30 of the present invention has a box-like overall shape and a wide shape, and has a jet propulsion system located at the center of the stern 40 in the width direction for maneuvering the boat by angularly displacing it around the longitudinal axis. Since the nozzle 41 is provided, the straightness of the hull 30 is poor and there is a tendency for the hull 30 to skid easily. , its outer parts 133, 141
is protruded below the extension of the inner hull line l, which improves the above-mentioned effect, that is, straightness,
It can prevent skidding.

Further, according to the present invention, the portions 134a, 1 near the stern ends of the top surfaces 134, 145 of the grooves 43, 44
The slope α is set so that the stern 45a becomes downward as the stern moves toward the rear, so that a lift force can be generated at the stern 40, so that the ship can quickly enter a planing state without causing porpoise. .

Furthermore, according to the present invention, the top surfaces 134, 145 of the grooves 43, 44 are flat;
Part 134a, 145 near the stern end of 4,145
The portion ahead of point a is parallel to the flat bottom portion 139, thereby suppressing vertical movement and improving straightness.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a small personal watercraft according to an embodiment of the present invention, FIG. 2 is a perspective view of the bottom of the hull 32 of the hull 30, and FIG. 3 is a perspective view showing the chain shape of the outer portion 133 of the groove portion 43. 4 are cross-sectional views of the bottom of the hull 32 near the stern 40. 30...hull, 32...hull, 43,44...
Concave groove, 133...Outer part, 134...Top part, 13
5... Side, 136... Bottom, 137... Side,
138...Bottom part, 139...Bottom flat part.

Claims (1)

[Claims for Utility Model Registration] (a) The hull 30 has a box-like overall shape and a wide shape, and a nozzle for jet propulsion is installed in the widthwise center of the stern 40 of the hull 30. 41 is provided, and the boat is maneuvered by angularly displacing the nozzle 41 around the longitudinal axis. Outer portions 133, 141 of grooves 43, 44
(d) An outer bottom portion 13 that is inclined upwardly from each outer portion 133, 141 toward the outer side.
(e) inner bottom portions 138, 14 which are inclined downwardly from the inner side 142, 143 of each groove 43, 44 toward the center along the inner bottom line l;
4 are connected, respectively, and (f) the center of the inner hull bottom portions 138 and 144 is
(g) The top surfaces 134, 145 of the grooves 43, 44 are flat, and the portions 134a, 145a near the stern ends thereof are flat. The slope α becomes downward toward the rear.
is attached, and the portions 134a and 145 near the stern end thereof are attached.
A small personal watercraft characterized in that a portion forward of point a is parallel to a flat bottom portion 139.