JP2726034B2 - Small jet propulsion boat - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small jet propulsion boat that mainly travels alone at high speed on the sea. 2. Description of the Related Art In recent years, small jet propulsion boats, which are small boats equipped with an engine and are designed to glide on water, have been widely used. This ship performs various operations (exercises) such as sudden start and sudden turn while slid, and if it does not involve the skill of the pilot, it will overturn and fall. After the water falls, they re-embark and continue driving. [0003] When a pilot who has fallen in water re-boards, it is easy to re-board if the hull is tilted to sink the side of the boat near the water surface. The balance is lost depending on the weight of the pilot, and it is easy to overturn again. Therefore, it is desirable that the hull is easily inclined until the upper end surface of the deck on the side of the ship is near the water surface, and it is desirable that the hull be less inclined when boarding. That is, it is desirable that the boat form has a small restoring force up to a certain inclination angle, and has a maximum restoring force at the inclination angle. The present invention has been made to solve such a conventional problem, and provides a small jet propulsion boat which enables a passenger who has fallen in water to easily re-board. According to the present invention, in a small jet propulsion watercraft, a deck portion is formed so as to protrude forward from a longitudinal center portion of a hull, and is surrounded by the deck portion and a bottom plate. A buoyancy space is formed in the part that is to be lifted, and a handle with a structure that does not move up and down is provided on the upper surface of the deck. And the hull deck is formed continuously from the front end to the rear end of the foot deck, and the distance from the water surface to the foot deck is greater than the distance from the foot deck to the upper end of the hull deck when no occupants are on board. It is configured to be small, the stability is maximized at an inclination angle where the upper side of the ship deck is near the water surface, and the upper surface of the seat is higher than the upper end of this ship side deck What is located. As described above, the present invention has a structure of the hull itself in which the foot deck is open to the stern end, while the hull deck extends continuously from the front end to the rear end of the foot deck. Therefore, when the hull is tilted, water enters from the stern into the foot deck, and water accumulates in the space surrounded by the inner surface of the side deck and the outer surface of the foot deck and seats. The hull can be easily inclined up to an inclination angle at which the upper end surface of the ship side deck approaches the water surface. In addition to the above structure, the structure of the hull itself is configured so that the stability is maximized at the angle of inclination, and the upper surface of the seat is located above the upper end surface of the deck on the side of the boat. While resting on the deck upper end surface, it is possible to grab the upper end of the seat and easily re-board from the ship side,
Therefore, in this type of ship where overturning often occurs,
It is very useful. [0007] Also, in a state where the occupant is not on board,
Since the distance from the water surface to the foot deck was set smaller than the distance from the foot deck to the upper end of the ship side deck,
The distance between the water surface and the foot deck is reduced, and the distance between the foot deck and the upper end of the deck is increased, so that when a waterfall person inclines the hull, it is surrounded by the inner surface of the ship side deck and the outer surface of the foot deck and seats. A large amount of water can be stored in a closed space. Therefore, the lateral movement of the buoyant when the hull is tilted can be minimized, and the hull can be tilted more easily to the tilt angle at which the upper end surface of the boat deck approaches the water surface. 1 to 3, a hull 10 is surrounded by a bottom plate 20, a side plate 80, an upper deck 21 formed forward of the center of the hull, and a stern plate 70. The engine room is configured such that a portion to be drained has a drainage volume, and a substantially enclosed engine room is formed in a portion surrounded by the bottom plate 20 and the upper deck 21. In the rear part, a seat 50 is formed so as to protrude at the center in the ship width direction.
A foot deck 30 that opens to the stern end is formed between the zero and the gunnels 88 on both sides. The foot deck 30 and the lower side of the seat 50 are also configured to have a drainage volume. Further, the ship deck is formed continuously from the front end to the rear end of the foot deck 30. A handle support 61 is provided on the upper deck 21.
The handle 21 is formed at the upper end thereof, and the deck 21 at the portion where the handle support 61 is provided is formed so as to protrude, and an engine room serving as a buoyancy space is formed below the deck 21. The operator 11 on the seat 50 drives the hull 10 by gripping the handle 60 with his feet on the foot deck 30. [0010] A propeller (not shown) is rotated by an engine in the engine room to suck water from a water suction port at the bottom of the hull, and is swung horizontally in the stern through a flow passage formed below the seat 50. By injecting water backward from 71, a turning force and a propulsion force are generated. When the hull 10 is tilted, the restoring force increases as shown in FIG. 5 up to the tilt angle θ (30 ° in this embodiment) at which the upper end surface 81 of the ship deck approaches the water surface 90. It is configured such that the maximum restoring force is generated at the inclination angle. In the above-described configuration, the operator 11 has the hull 10
When the water falls from the water, the hand reaches out from the water as shown in FIG. 4 (A), grasps the upper end surface 81 of the ship-side deck, pulls it down as shown by the arrow, and lowers it as shown in FIG. 4 (B). 8
The hull 10 is tilted until 1 comes close to the water surface 90. Due to the inclination of the hull 10, the buoyancy continuously moves sideways in the front part (engine room) of the hull 10, but in the rear part of the hull 10, water enters from above the stern onto the foot deck 30 so that the buoyancy is reduced. There is little lateral movement, so that the hull 10 can be easily tilted until the upper end surface 81 of the ship deck approaches the water surface 90 (the state of FIG. 4B). In this state, the operator 11 moves the upper deck surface 81 of the ship side deck.
To the hull 10 on which the restoring force (the moment due to the downward force acting on the center of gravity G and the upward force acting on the buoyancy B) is maximized. There is no danger that the body 10 will overturn, and it is possible to stably board. That is, even if the weight of the pilot 11 acts on the point g on the upper end surface of the boat side deck, the hull 10 does not overturn. After boarding, the operator 11 returns to the state shown in FIG. As described above, in the above configuration, the hull 10 can be easily inclined up to the inclination angle at which the upper end surface 81 of the hull deck approaches the water surface, and the maximum stability is generated in that state. As a result, a pilot who has fallen can easily re-board. Also, the hull itself was configured so that the water surface passes through the outer surface facing the inclined side of the hull of the outer surface of the seat at the inclination angle where the upper end surface of the ship side deck is near the water surface. In this case, a large amount of water can be stored in the space surrounded by the inner surface of the side deck, the foot deck, and the outer surface of the seat, so that the buoyant sideways movement when the hull is tilted is reduced. This makes it possible to more easily incline the hull to an inclination angle at which the upper end surface of the ship side deck approaches the water surface. As described above, according to the present invention, the structure of the hull itself is such that the foot deck is open to the stern end, while the hull deck continuously extends from the front end to the rear end of the foot deck. As the hull is tilted, water enters from the stern into the foot deck and floats in the space surrounded by the inside surface of the hull deck and the outside surface of the foot deck and seats. The hull can be easily inclined up to an inclination angle where the upper end surface of the side deck approaches the water surface with little lateral movement of the heart. Further, in addition to the above configuration, the structure of the hull itself is configured so that the stability is maximized at the inclination angle,
In addition, since the upper surface of the seat is located above the upper surface of the deck on the side of the ship, the water faller can step on the upper surface of the upper side of the deck while grabbing the upper end of the seat and easily re-board from the ship side. It is very valuable in this type of ship where overturning often occurs. In the state where the occupant is not on board,
Since the distance from the water surface to the foot deck was set smaller than the distance from the foot deck to the upper end of the ship side deck,
The distance between the water surface and the foot deck is reduced, and the distance between the foot deck and the upper surface of the side deck is widened. A large amount of water can be stored in a closed space. Therefore, the lateral movement of the buoy when the hull is tilted can be minimized, and the hull can be tilted more easily to the tilt angle at which the upper end surface of the boat side deck approaches the water surface.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing an embodiment of the present invention. FIG. 2 is a side view of FIG. FIG. 3 is a rear view of FIG. 1; FIG. 4A is an explanatory view showing a falling state, and FIG. 4B is an explanatory view showing a boarding state. FIG. 5 is a stability characteristic diagram of the hull. [Description of Signs] 10 Hull 11 Pilot 21 Deck 30 Foot Deck 50 Seat 81 Ship deck upper end surface 88 Gunnel 90 Water surface

Claims (1)

(57) [Claims] In a small jet propulsion boat, a deck portion is formed so as to protrude forward from a longitudinal center portion of a hull, and a buoyancy space is formed in a portion surrounded by the deck portion and a bottom plate, and does not move up and down on the deck upper surface. A handle of the structure is provided, a seat is provided in the center of the hull behind it, and a foot deck that opens to the stern end is formed between the seat and the deck on both sides of the hull,
And the ship deck is formed continuously from the front end to the rear end of the foot deck, and the distance from the water surface to the foot deck is set to be smaller than the distance from the foot deck to the top surface of the ship deck when no occupants are on board. A small jet, wherein the stability is maximized at an inclination angle at which the upper end surface of the side deck is near the water surface, and the upper surface of the seat is located above the upper end surface of the side deck. Propulsion boat.