JPS62122897A - Small jet propulsion boat - Google Patents

Abstract

PURPOSE:To facilitate return to a boat of an operator who fell off a boat by forming the structure of a boat so that the boat can be easily inclined to the angle of inclination at which the deck top surface approaches the water surface and its stability is maximized at that angle. CONSTITUTION:When an operator 11 fell off a boat 10, the operator 11 grasps the deck top surface 81 and pulls down it in an arrow direction to incline the boat 10 until the top surface 81 approaches the water surface 10. By inclination of the boat 10, the buoyancy center of the boat continuously moves in a lateral direction in the front of the boat 10. However, in the rear, the lateral movement of the buoyancy center is small since water enters a foot deck 30 from the stern. Therefore, the boat 10 can be easily inclined until the deck top surface 81 approaches the water surface 90. In this state, the operator 11 holds the top surface 81 in his foot to ride the boat, and at that moment, the stability of the boat is maximized.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a small jet propulsion boat that is primarily a single-person boat that sails at high speed on the sea.

(Prior Art) Recently, small jet propulsion boats, which are small boats equipped with engines and are designed to glide on water, have come into widespread use. This boat glides on the surface of the water and performs various operations (movements) such as sudden starts and sharp turns, so if the operator is not skilled enough, it will capsize and fall into the water. If the operator wants to reboard the boat after falling overboard, it is easier to do so by tilting the boat so that the side of the boat sinks close to the water surface. It's hard to capsize again. Therefore, it is desirable that the hull be easy to tilt until the upper end surface of the side deck is close to the water surface, and that it is difficult to tilt further when boarding. In other words, it is desirable to have a boat shape in which the restoring force is small up to a certain angle of inclination, and the restoring force is maximum at that angle of inclination.

(Object of the Invention) The present invention has been made to solve the above-mentioned conventional problems, and provides a small jet propulsion boat that allows passengers who have fallen overboard to easily re-board the boat.

(Structure of the Invention) The present invention provides a small jet propulsion watercraft, in which a deck portion is formed to protrude forward from the center portion in the longitudinal direction of the hull, the lower side thereof is a buoyancy space, and the rear portion is provided at the center of the hull. A foot deck that opens to the stern end is formed between the seat and the side decks on both sides, and the stability is maximized at the slope angle where the upper end of the side deck is near the water surface. It is.

In this way, the structure of the hull itself is configured so that it is easy to tilt up to an angle where the upper end surface of the side deck approaches the water surface, and the IIn force is maximized at that angle of inclination, so that a person falling overboard can You can easily reboard.

(Example) In FIGS. 1 to 3, the hull 10 has drainage water in the area surrounded by the bottom plate 20, the side plates 80, the upper deck 21 formed forward of the center of the hull, and the stern plate 70. The engine room is configured to have a volume, and is surrounded by the bottom plate 20 and the upper deck 21.

Further, a seat 50 is formed protruding from the center in the width direction of the ship, and a foot deck 30 that opens to the stern end is formed between the seat 50 and the gunwales 88 on both sides. The underside of the foot deck 30 and the seat 50 is also configured to have a drainage volume.

A handle support portion 61 is formed to protrude on the upper deck 21, and a handle 60 is formed at the upper end of the handle support portion 61. The portion of the deck 21 where the handle support portion 61 is provided is formed to protrude, and a buoyancy space is provided at the lower part of the deck 21. An engine room is formed.

Further, the person 11 on the seat 50 puts his or her feet on the foot deck 30 and grips the handle 60 to drive the boat 10.

A propeller (not shown) is rotated by the engine in the engine room, sucks water from a water suction port on the bottom of the boat, passes through a flow path formed under the seat 50, and sends water from a horizontally swinging nozzle 71 at the stern of the boat. By injecting it backwards, turning force and propulsive force are generated.

When the hull 10 is tilted, the restoring force increases as shown in FIG. The structure is such that maximum stability is generated at .

In the above configuration, if the operator 11 falls into the water from the hull 1o, as shown in FIG. As shown in FIG. 4(B), the hull 10 is tilted until the upper end surface 81 approaches the water surface 90. Due to the inclination of the hull 1o, the center of buoyancy continuously moves sideways in the front part (engine room) of the hull 10, but at the rear of the hull 1o, the center of buoyancy moves sideways as water enters the foot deck 30 from the stern. movement is small, so the upper end surface 81 of the ship's side deck is at the water surface 9.
The hull 10 can be easily tilted to a state approaching 0 (the state shown in FIG. 4(B)). In this state, the operator 11 puts his feet on the upper end surface 81 of the ship's side deck and
When getting on board, there is no risk of the hull 10 capsizing because the restoring force (the moment due to the downward force acting on the center of gravity G and the upward force acting on the center of buoyancy B) is at its maximum. , it is possible to board the ship in a stable manner. That is, even if the weight of the operator 11 acts on point 0 on the upper end surface of the ship's side deck, the hull 10 will not capsize. After boarding the ship, pilot 11 is seated in seat 5.
By sitting at 0, the restoring force returns to the state shown in FIG. 3.

In this way, in the above configuration, the hull 10 has the upper end surface 8 of the side deck.
1 can be easily tilted to a tilt angle close to the water surface, and the structure is configured so that maximum stability is generated in that state, so a pilot who falls overboard can easily re-board the ship. .

(Effects of the Invention) As explained above, the present invention allows the hull structure to be easily tilted to an angle where the upper end surface of the ship's side deck approaches the water surface, and to maximize stability at that angle of inclination. Because of this structure, those who fall overboard can easily re-board the ship, making it extremely useful for ships of this type that often capsize.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is a side view thereof, FIG. 3 is a rear view thereof, and FIG. Fig. 5 is a stability characteristic diagram of the hull. 10...Hull, 11... Operator, 21... Deck, 30... Foot deck, 50... Seat, 81...
- Upper end of ship's side deck, 88...gunwale, 90...water surface. Patent Applicant Yamaha Motor Co., Ltd. Representative Patent Attorney Etsushi Kosho Patent Attorney Masamukai Chief 1) Patent Attorney Yasuo Itasho Figure 3

Claims (1)

[Claims] 1. In a small jet propulsion boat, a deck section is formed by protruding forward from the longitudinal center of the boat, and the lower side is a buoyancy space, and behind it there are seats in the center of the boat, and seats on both sides of the deck. A small jet propulsion boat, characterized in that a foot deck that opens at the stern end is formed between the boat side deck and the boat side deck, and is configured so that the stability is maximized at an inclination angle such that the upper end of the boat side deck is near the water surface. .