JPS624686A - Ship bottom structure of small-sized vessel - Google Patents

Abstract

PURPOSE:To reduce the propulsion resistance on sliding and permit the sharp turn by forming the stripes at the position in 70-90% of the width between chines in the vicinity of the chine part on the starting-up inclined surfaces formed onto the both sides from the flat keel part at the center part of the ship bottom. CONSTITUTION:In a small-sized sliding boat for leisure, a cockpit having the center part as seat is formed at the rear part of a hull, and a steering wheel is arranged in the front part, and a flat keel 7 having the width in 15-40% of the width L between chines is formed at the center part on the ship bottom. The starting-up inclined surfaces 2 in 10-20 deg. are formed onto the both sides of the keel 7, and stripes 22 having the width in 70-90%, the propulsion resistance can be reduced through the cutwater by the stripes 22 and the sliding between the stripes 22. Further, on turning, the ship can turn sharply with the stripe 22 as edge by tilting the hull.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a 4M hull construction for a small boat that has low propulsion resistance during planing and can exhibit excellent operational performance.

(Prior Art) Recently, small boats with engines that glide on water have come into wide use. This ship glides on the water surface and performs various maneuvers (movements) such as sudden starts and sharp turns, and is therefore required to have excellent maneuverability. Furthermore, since it is a small vehicle that can seat one or two people, it needs to have good stability, and it also needs to have low propulsion resistance for high-speed cruising. Until now, no small vessel has been found that satisfies these various requirements at the same time.

(Purpose of the Invention) This invention has been made to solve these conventional problems, and has excellent stability, low propulsion resistance during skiing, and improved driving performance such as sudden starts and sharp turns. The purpose of the present invention is to provide a bottom structure for a small ship that can perform well.

(Structure of the Invention) The present invention provides a small boat in which a cockpit is formed at the rear of the hull and a seat is formed protruding from the center in the width direction of the boat, and a chine space is provided in the center of the bottom in the width direction. A flat keel with a width of 15 to 40% of the width of the keel is formed, and the bottom of the ship on both sides is inclined at an inclination angle of 10 to 20 degrees. The width between the stripes is set to 70 to 90% of the width between the chines.

In this way, the bottom of the ship is formed flat, and the shape of the waterline surface of the ship's bottom differs between when it is stopped and when it is planing due to the chines and the stripes inside the chines. is made smaller.

(Example) In FIGS. 1 to 4, the hull 1 is composed of a bottom plate 2, a bow bottom plate 20, a side plate 8, and an upper deck 21. A sealed engine room is formed. Further, a cockpit 3 is formed above the stem, and a seat 5 is formed to protrude from the center in the width direction of the ship. Upper deck 2
A pillar 60 is formed to protrude from the column 1h, and a handle 6 is formed at the upper end of the pillar 60, so that the person 10 on the seat 5 places his or her feet on the cockpit 3 and selects the handle 6 to drive the ship. ing.

An engine (not shown) is disposed in the engine room, and a blower rotated by this engine is disposed below the seat 5, sucks water from the water suction lower 0 on the bottom of the boat, and has a nozzle 72 that swings horizontally. By injecting it backwards, turning force and propulsive force are generated.

A flat keel 7 is formed at the center of the bottom of the ship in the width direction,
A gently sloping bottom plate 2 is formed on both sides of the key lure, and a chine 9 is formed at the intersection of the bottom plate 2 and the side plate 8. A stripe 22 is formed.Width B of the keel 7
is 15 to 40% of the width between chines 9, preferably 18
%, and the inclination angle θ of the bottom plate 2 is 10 to 20''.
, preferably 15°, and the width l between the two stripes 22 is 70 to 90 degrees of the width of both chines 911.
It is set to %.

In the above configuration, when the ship is stopped or running at low speed, the bottom plate 2 of the ship is completely submerged, that is, the water line crosses the side plate 8, and therefore the water line is wide and stable. Also, when planing at high speed, the dynamic pressure of water causes the hull to
floats up, is drained by the stripes 22, and slides on the bottom surface between both stripes 22. That is, since the water line surface is a narrow area regulated by both stripes 22, the friction surface with water is reduced, and the propulsion resistance is also reduced. Furthermore, in this sliding state, a flat surface is formed by the keel 7 with a flat waterline surface and the bottom plate 2 with a small slope, so if the ship turns without tilting, the bottom of the ship will slip on the water surface. It is possible to make a sharp turn (so-called slip turn) by tilting the boat, and when the boat makes a turn with the hull tilted, the chines 9 act as an edge, making it possible to make a sharp turn.

In addition, the width of the keel 7 is made smaller at the bow, and the inclination of the bottom plate 2 is made greater at the bow, so that the bottom of the ship at the rear of the ship's center of gravity (near the center in the longitudinal direction of the ship) It may be made flat and shaped close to a V-shape in front of the center of gravity.

By making the front part of the hull V-shaped and the rear part of the hull flat in this way, it becomes easier to cause sideslip at the rear part of the hull, making it possible to turn with a very small turning radius.

(Effects of the Invention) As explained above, in this invention, the bottom of the ship is formed flat, and the shape of the bottom waterline surface when stopped and when planing is made different by the chines and the stripes inside the chines. As a result, stability is excellent when stopped, and the 1 tt acceleration resistance is reduced when skidding, and furthermore, the driving performance is excellent.

[Brief explanation of the drawing]

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. 4 is a perspective view of the bottom of the ship. 1... Hull, 2... Bottom plate, 3... Cockpit, 5... Seat, 6... Handle, 7... Keel,
8... Ship side plate, 9... Chine, 22... Stripe. Patent Applicant Yamaha Motor Co., Ltd. Representative Patent Attorney Etsudo Kotani Patent Attorney Masamukai Chief 1) Patent Attorney Yasuo Itaya Figure 3 Figure 4

Claims (1)

[Claims] 1. A cockpit is formed at the rear of the hull, and
In a small boat with a seat protruding from the center in the width direction, a flat keel with a width of 15 to 40% of the width between the chines is formed in the center of the bottom in the width direction, and a flat keel is formed on both sides of the keel. The bottom of the ship is formed at an angle of inclination of 10 to 20 degrees, and a stripe is formed on this bottom near the chines where water is drained while sliding, and the width between the two stripes is 70 degrees of the width between both chines. A bottom structure of a small ship, characterized in that the ratio is set to 90%.