JPH02151591A - Small water plane single-hull ship utilizing lift by fin - Google Patents

Abstract

PURPOSE:To contrive the stabilization of a ship, when it is in sailing, by symmetrically providing a hydrofoil overhung longitudinally to right and left in a submerged part, mounting a movable flap to this hydrofoil and controlling the flap adjusting lift in right and left. CONSTITUTION:A hydrofoil 2, overhung symmetrically to right and left, is mounted longitudinally at least two parts in both sides of a ship body 1 in a submerged lower part, and a drivable flap 3 is mounted to a rear end of each hydrofoil 2. In the time of sailing, lift is generated in the hydrofoil 2 lowering a draft to LWR from LWS, and a water plane narrows its width decreasing wave making resistance or simultaneously generating unstable rolling by narrowing this width. Then the flap is adjusted in its angle in right and left, ensuring stability. While also pitching is prevented by adjusting the angle of the front and rear flaps 3. Accordingly, a small water plane single-hull ship A, generating small fluid resistance when it is in high speed sailing, can perform stable sailing even in the time of low speed sailing.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a small waterline monohull boat (
(hereinafter referred to as 5WASH).

(Prior art) A small waterline monohull (Fig. 6) has low hull resistance and is suitable as a high-speed ship. However, because the water line is narrow, it lacks stability against rolling motion.

For this reason, if the water line is widened to ensure stability, the resistance will increase.

The following methods have been used to improve the stability of ships:

1) Fin stabilizers using fins are known, but they do not support the weight of the ship.

2) Hydrofoils, however, because the entire weight of the ship is supported by the wings, it is difficult to make them large, and the propulsion system also requires a large horsepower.

3) It is known that wings are attached between the left and right hulls of twin-hulled ships, but this has not yet been found for single-hulled ships.

(Problem to be solved by the invention) 5WA that is stable against rolling and pitching at both high and low speeds
The purpose is to provide SH.

(Means for Solving the Problems by the Invention) In a small waterline type monohull boat, hydrofoils are provided in the submerged portion and project symmetrically from front to back and from side to side, and movable flaps are attached to the wings.

(Example) An explanation will be given based on FIGS. 1 and 2. 5WA according to the present invention
SH(A) has a cross section of the hull with a bulge at the submerged lower part 1. Although the waterline section is sandwiched in between, the width of the waterline LWS when stopped is larger than the waterway LWR when cruising at high speed, ensuring lateral stability.

At least two hydrofoils 2 are installed on both sides of the hull at the submerged lower part, front and rear, and project horizontally in a symmetrical manner.

Each hydrofoil 2 has a drivable flap 3 attached to its rear end.

(Function) 1) During high-speed sailing; lifting force is generated in the hydrofoils 2 and lifts the ship. Then, lower the stuttering from LWS to LWR (second
figure). As shown in Figure 2, in this type of swamping, the width of the water line is narrow, and the wave-making resistance of the ship is reduced, while at the same time the flooded surface area of the ship is also reduced, and the resistance of the ship as a whole is reduced.

However, at this time, the width of the water line is narrow, making it unstable due to rolling motion. Therefore, the angle of the flap 3 attached to the rear end of each underwater x2 is adjusted from side to side to ensure stability. Furthermore, by adjusting the angles of the front and rear flaps 3, it is possible to prevent the ship from pitching. The reason is given below.

(a) In the case of preventing rolling (Figure 3): To return the inclination angle φ, the angle of the flaps 3 is reversed on the left and right, and the lift force of the hydrofoil 2 is changed on the left and right, so that L=4Q, ΔF L: Restoration moment F: Steady lift force Q Engineering: Distance ΔF from the center line of the hull to the hydrofoil = A restoring moment is given by the change in lift due to flap operation. In this case, since the front and rear hydrofoils 2 have the same flap 3 angle, no moment that causes pitching acts.

(b) In the case of pitching prevention (FIGS. 4 to 5): In this case, the left and right flap angles are in the same direction, and the front and rear flap angles are reversed.

As a result, when the ship trims θ (Fig. 4), a righting moment of M=2CQp +AP, )ΔF1 is generated in the longitudinal direction.

M: Restoration moment Q @ , J, : Distance in the longitudinal direction from the center of gravity of the ship to the hydrofoil ΔF: Change in lift force 2) When the ship is stopped and when sailing at low speed; the lift force acting on the hydrofoil 2 is 2 of the acceleration At such low speeds or when stopped, there is no lift and the ship's attitude cannot be controlled. At this time, since there is no lifting force from the hydrofoil 2, the ship's water becomes deep, resulting in LWS as shown in Figure 2. In this type of water, the width of the water line is wide, and stability is obtained from changes in buoyancy similar to those of a normal ship, making it stable.

(Effect) Hydrofoils are installed symmetrically on both sides of the lower part of the submerged part of the ship, and while the ship is sailing, the lift of the wings lifts the ship a certain amount, and in this state, the water line is narrowed to minimize the ship's resistance. do. At this time, the flap attached to the rear end of the horizontal
Stable navigation of the ASH is now possible even at low speeds.

[Brief explanation of the drawing]

FIG. 1 is a side view of 5WASH according to the present invention. Figure 2 is a left side view of Figure 1. 3 to 5 are explanatory diagrams of the lateral and lateral stability of 5WASH according to the present invention. FIG. 6 is an explanatory diagram of the known 5WASH. In the figure; A 5WASH 1 Submerged lower part 2 Hydrofoil 3 Flap and above Applicant Sumitomo Heavy Industries Co., Ltd. sub-agent Patent attorney Isamu Ohashi Figure 5 Figure 6 Figure 4

Claims (1)

[Claims] A small waterline type monohull boat that utilizes the lifting force of fins, characterized by having hydrofoils protruding front and rear, left and right symmetrically in the submerged part, and movable flaps attached to the hydrofoils. Waterline monohull.