JPS61200079A - Full submergence type hydrofoil boat - Google Patents

Abstract

PURPOSE:To improve rolling stability at turning by providing flaps at the submerged portion of struts that are protruded from the front and rear of the hull and provided with hydrofoils mounted on their tips and turning the flaps of the front and rear struts to the same direction, then making the steering angle of the rear flap smaller than that of the front flap. CONSTITUTION:Struts 2 and 3 are protruded at the front and rear of the center of gravity of a hull, respectively, and full submergence type hydrofoils 4 and 5 are provided on their tips. Flaps 6 and 7 are provided at the submerged portion of the front and rear struts 2 and 3 and these flaps 6 and 7 are interlocked and operated in the same direction. In this case, the steering angle of the rear flap 7 is made smaller than that of the front flap 6. The hydrofoils can substantially be moved around the center of gravity of the hull and the hull can be tilted with preset angles. As a result, the rolling stability at turning can be secured and the movement performance can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a fully immersive hydrofoil boat with excellent maneuverability.

(Prior Art) Hitherto, fully immersed hydrofoils have been known which have struts projecting downward from the bottom of the ship and fully immersed hydrofoils attached to the tips of the struts on the front and rear sides of the center of gravity of the hull. This hydrofoil boat has struts that penetrate the water surface and the hydrofoils are fully submerged, making it less susceptible to waves and providing a comfortable ride, but this alone does not provide resilience. Furthermore, when the ship turns, if the ship is upright, centrifugal force acts and a tilting moment acts on the ship, so it is necessary to provide an inward tilt corresponding to the centrifugal force.

A conventional hydrofoil boat has at least a pair of left and right ailerons on the hydrofoil, which generate a heeling moment. That is, by raising one of the hydrofoils and lowering the other by means of the left and right ailerons, the hull on the water surface is moved toward the turning center, thereby tilting the hull at a predetermined angle. Since the ship is tilted by moving the center of gravity of the ship, its operation is slow, and therefore, there is a disadvantage that it is not possible to make sharp turns.

(Purpose of the Invention) This invention was made in order to eliminate such conventional drawbacks, and by moving the hydrofoil laterally, the movement of the center of gravity of the ship is reduced and the lateral-slanting of the ship is corrected. Also, the hull is quickly tilted inward at a predetermined angle, thereby ensuring lateral stability when traveling straight and making stable sharp turns possible.

(Structure of the Invention) The present invention provides a hydrofoil boat having one strut on the front side and one on the rear side of the center of gravity of the hull, and a fully immersed hydrofoil at the tip of the strut, in which each underwater part of the front and rear struts has a It has a flap provided and an operation means for operating this flap, and this operation means operates the front and rear flaps in conjunction with each other in the same direction, and also changes the steering angle of the rear flap to the steering angle of the front flap. It is configured to perform smaller steering operations. In this way, the hydrofoil itself is laterally moved by the flaps of the struts to cause the hydrofoil itself to be laterally tilted, and the lateral stability is improved by rapidly tilting the hydrofoil to a predetermined angle during a turn.

(Example) In FIG. 1 and FIG. 2, a pair of struts 2.3 are provided on the bottom of the hull 1 to protrude downward from the front and rear sides of the center of gravity of the hull. Hydrofoils 4 and 5 are attached to each. Flaps 6.7 are attached to the underwater portions of the struts 2 and 3, and the flaps 6.7 are pivoted from side to side around vertical axes 22.32 as shown by broken lines in FIG. 2 by operating means (not shown). It is configured.

The forward angle of attack of the front hydrofoil 4 can be changed, and the height of the hull above the water surface is measured while cruising using ultrasonic waves emitted from the lower part of the bow to the water surface, and the hydrofoil 4 is adjusted according to the measured value. By changing the angle of attack of 4, the ship floats or sinks, thereby maintaining the ship at a constant height above the water surface while sailing. In addition, the configuration of this point,
Since the operation may be performed using known means, detailed explanation will be omitted. Although the propulsion device is not shown, any known means such as propeller propulsion or jet propulsion may be used.

The configuration of the flap can be modified in various ways, for example, the third
It may be configured as shown in the figure. That is, the struts 20.30 are formed in a cylindrical shape, the flaps 60.70 are formed in a streamlined shape and are attached to enclose the struts 20.30, and the hydrofoils 4 and 5 are attached to their lower ends. ing. That is, the flaps 60 and 70 are configured to play the role of struts. and flap 60.70 with strut 20.30 and underwater 114
．． 5 and struts 20 and 30. Alternatively, the strut 20.30 and the underwater m4.5 may be fixed so that only the flap 60.70 rotates around the strut 20.30.

A pair of struts having flaps may be provided at the front and rear as shown in FIG. 2, or one strut may be provided at the front and rear as shown in FIG.

In the case of a small boat, it is preferable to use one strut at the front and the rear because the structure is simpler and lighter, and it is also preferable in terms of operation.

Further, flaps may be formed not only on the struts but also on the hydrofoils so that a tilting moment is generated by both the flaps of the struts and the flaps of the hydrofoils.

Operating means (not shown) for the flaps 6.7 or 60.70 are provided in the hull so that the front and rear flaps 6.7 or 60.70 can be operated simultaneously. This operation angle is such that the flap 7 on the rear side is smaller than the flap 6 on the front side, and is operated so as to adjust the inclination angle of the hull as described later.

Next, the operation of this device will be explained. The ship is propelled by a propulsion device (not shown), and when it reaches a certain speed, the lift of the hydrofoils 4.5 lifts the ship 1 above the water surface.
TIJ4 underwater with strut 2.3 penetrating the water surface
．． 5 sails completely submerged in water. And while sailing,
The hull 1 is maintained at a constant height above the water surface by adjusting the angle of attack of the front hydrofoil 4. Turning is performed by operating the flaps using the operating means as described below.

In Fig. 4, 3f is the buoyancy application point of the front hydrofoil 4;
Ba indicates the point of buoyancy action in the water 115 on the rear side, and G indicates the planar arrangement of the center of gravity of the hull 1.

First, considering the effect of operating only the front flap, if the flap 60 is operated to the right as shown in the imaginary line, the hydrofoil and buoyancy action point 13f move to position a, and the center of gravity G of the hull 1 returns to its original position. The direction of the ship is straight line a-B.
The ship tilts in direction a. The amount of inclination corresponds to the distance between the position G1 corresponding to the center of gravity on the straight line a-Ba (the center of gravity of the ship assuming that the ship does not incline) and the original center of gravity G. This amount becomes smaller as the center of gravity G approaches the rear. Note that the center of gravity G may shift to the rear when, for example, the loading position on the hull changes.

On the other hand, when the flap 70 is operated to the right as shown by the imaginary line at the same time as the flap 60, the buoyancy application point Ba moves to the position b, and the ship's direction becomes straight IIa-b. Along with this, the ship's inclination is equivalent to the distance G-G2, and in this case, even if the center of gravity G moves to the rear, the center of gravity equivalent position G2 must be moved from G by an amount equivalent to the amount of movement of the flap 70. This makes it easy to tilt the ship, and the movement of the flaps is done quickly because the center of gravity G of the ship is hardly moved.

In order to turn a ship, it is necessary to tilt the ship toward the center of the turn to prevent it from capsizing due to centrifugal force, and for this purpose, it is necessary to tilt the ship in the turning direction according to the amount of the turn. For this reason, the flap 70 is configured to be operated in the same direction at an angle smaller than the operating angle of the flap 60. For example, when making a left turn, first operate both flaps 60° and 70 to the right as described above to tilt the ship at a certain angle. Then, when the flap 60 is operated to the left, the flap 70 is also operated to the left by an angle smaller than that of the flap 60, and the ship turns to the left. This turning causes centrifugal force to act on the ship, and the inclination angle and turning opening can be adjusted so that the resultant force of this centrifugal force and the gravity of the ship acts perpendicularly to the ship, thereby making a stable turn. Can be done.

In addition, since the above resultant force is larger than the mm of the ship's hull when traveling in a straight line by the component of centrifugal force and tends to sink the ship, by adjusting the angle of attack of the front hydrofoil during the above left turn, The buoyant force is increased by an amount corresponding to the component of the centrifugal force.

In this way, to make a left turn, first operate the front and rear flaps in conjunction with each other to the right, quickly tilt the ship to the left at a predetermined angle, and then operate the flaps to the left to make a stable turn. It can be carried out. Also, to make a right turn, just do the opposite operation to the above. Incidentally, the heel of the ship during a turn is created by operating the rear flap at the same time as the front flap in the same direction and smaller than the front flap. The reason why it is made smaller than the angle is as follows.

In other words, if the rear flaps are operated by the same amount as the front flaps, only a heeling moment is generated, so the ship can heel more.
This is because no turning moment is generated, so even if the flap is next operated for turning, the turning cannot be performed.

In addition, in the above explanation, the flap is 60.70 mm.
was used, but the effect is the same in the case of flap 6.7.

As described above, by forming flaps on the front and rear struts and operating them in conjunction, it is possible to easily create a predetermined amount of inclination, and at the same time, the center of gravity of the hull shifts only slightly. , which essentially moves the hydrofoils around the center of gravity of the hull, allowing the hull to heel rapidly. In addition, since no lateral force is applied to the hull, there is no risk of the hull overturning, and since no lateral force is applied to the passengers inside the ship, there is a sense of stability and excellent riding comfort.

(Effects of the Invention) As explained above, the present invention provides flaps in the underwater parts of the front and rear struts, and uses the operating means to move the front and rear flaps in the same direction and change the steering angle of the rear flap to the steering angle of the front flap. By moving the hydrofoils around the hull's center of gravity, the hull can be quickly tilted to a predetermined angle, thereby easily ensuring lateral stability when turning. , with improved athletic performance.

[Brief explanation of the drawing]

Fig. 1 is an overall perspective view of a hydrofoil boat showing an embodiment of the present invention, Fig. 2 is a horizontal sectional view of a strut, Fig. 3 is a view equivalent to Fig. 2 showing another example of the strut, and Fig. 4 is a FIG. 3 is an explanatory diagram of the operation of this invention. 1... Hull, 2.3.20.30... Strut,
4.5-...Hydrofoil, 6,7,60.70...Flap.

Claims (1)

[Claims] 1. A hydrofoil boat that has one strut on the front side and one on the rear side of the center of gravity of the hull, and a fully immersed hydrofoil at the tip of the strut, and has flaps installed on the underwater parts of the front and rear struts, and and an operating means for operating the flaps, and the operating means is configured to operate the front and rear flaps in conjunction with each other in the same direction, and to operate the steering angle of the rear flap to be smaller than the steering angle of the front flap. A fully submersible hydrofoil ship.