JPH06227478A - Small-sized high speed vessel - Google Patents

Abstract

PURPOSE:To provide a small-sized high speed vessel which possesses excellent balance in stability, sports performance, etc., with a novel vessel shape eliminating the disadvantage of a conventional vessel shape. CONSTITUTION:The front part of a hull is formed into a single hull part 2 of a single, trunk deep V vessel type, and the rear part of the hull is formed into a twin hull part 3 of a catamaran type. A perfectly submerged hydrofoil 4 having a dihedral angle is installed between the hull 3A and 3B of the catamaran part 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small high-speed boat having a capacity of about 10 or less for leisure and the like.

[0002]

2. Description of the Related Art The hull of a ship called a high-speed boat (bottom shape)
As shown in Fig. 4 (a), the V-shaped single-hull hull 32 has two hulls (two-hulls) 33A and 33B on the left and right as shown in Fig. 4 (a). There are 33 etc. The former is called the deep V hull type, and the latter is called the catamaran type. An example of such a hull type is, for example, "Trace of a certain boat designer" (written by Kotaro Horiuchi, Rudder Co., 1987, 8).
Published on the 31st of March). In addition, some high speed boats have hydrofoils.

However, in many cases, for a small-sized high-speed boat for leisure use, a single-body deep V boat type is adopted. Because it is possible to bank (tilt inward when turning), the lateral acceleration to the occupants can be reduced to allow smooth turning, and the speed reduction and impact acceleration in waves are smaller than other ship types.

[0004]

The single-cylinder deep V ship form has the advantages described above, but also has the following disadvantages. That is, the lateral stability is low both at rest and when sailing, the impact of waves hitting near the center of the bottom of the ship during sailing is still high, and depending on the load conditions, there may be some problems such as the popoise phenomenon (so-called dolphin movement). It is easy to cause stable movement.

The catamaran type is also used in some small high-speed boats, but this type has the drawbacks that it is not banked at all, and therefore has a large lateral acceleration that acts when turning, and that it is greatly shaken by a trailing wave and a transverse wave.

Problems also exist in a high-speed boat having a fully submerged hydrofoil. First of all, it is difficult for a ship that supports the entire bottom of the ship above the water surface by the lift of the fully submerged hydrofoil to have self-recovery property against disturbances such as wind waves. It is difficult. For such self-restoration, expensive automatic control (stabilization) devices are indispensable and training of operators is required.

An object of the present invention is to provide a small high-speed boat having a good balance of stability, sportiness, and the like, by using a novel boat form that solves the above disadvantages of each boat form.

[0008]

The small high-speed boat of the present invention comprises:
The front of the hull is a single-body deep V hull, the rear of the hull is a double-hull (or trihull) hull, and there is a dihedral angle between the hulls (that is, the left and right ends are compared to the central part). It has a fully submerged hydrofoil.

With regard to this small high-speed boat, as described in claim 2, it is preferable that each length of the catamaran is two-thirds or less of the entire length of the hull. In addition, according to claim 3, each shape of the catamaran viewed from the side is a trapezoid in which the length of the lower side with respect to the upper side is two-thirds or less (trapezoid or quadrangle or triangle close to it).
It is also good to

[0010]

The small high-speed boat of the present invention utilizes the advantages of the deep V hull type, catamaran type and fully submerged hydrofoil as follows, and exhibits balanced high performance.

A) First, as described above, the portion of the single-body deep V hull, which is the front part of the hull, has smooth turning performance and longitudinal stability against trailing waves.

B) The rear catamaran-shaped part provides lateral stability by generating buoyancy and lift at the two left and right parts of the catamaran, and the center part of the bottom of the ship is kept above the water surface during navigation. The effect of reducing the wave shock of. The reason why such a double-hulled portion is provided is to eliminate the inconvenience that the single-deep deep V hull has poor lateral stability and receives a large wave shock near the center of the bottom of the ship. The rear part of the hull was made into a catamaran type by removing the part after the center of the bottom, which is susceptible to shocks.

C) When the volume of the catamaran is large, as a drawback peculiar to the catamaran type, the sway caused by the trailing waves and the transverse waves becomes large, and it becomes difficult to bank at the time of turning, and the turning resistance also increases and the sportiness deteriorates. Therefore, the length and volume of the twin body are set to the minimum required for lateral stability. To achieve this, hydrofoil is installed between the catamaran. This hydrofoil does not support the entire weight of the hull, and since the lift due to the catamaran can be reduced by the amount of lift generated by the hydrofoil, the length of the catamaran that is easily affected by waves and easily causes turning resistance. Also, by reducing the volume, the drawbacks and sportiness in the above-mentioned trailing waves / transverse waves are improved. In addition, since the hydrofoil has a damping effect on shaking, it also reduces vertical pitching and vertical pitching, and also prevents divergence of popois. In addition, since the hydrofoil has a dihedral angle, it exhibits stability against rolling, so this high-speed boat is relatively easy to use, even if it does not have any special stabilizing means. Can have self-restoration.

By the way, the characteristics described in a) and b) above are as follows:
The influence on the performance is different depending on the ratio (size distribution) of the deep V ship type part and the catamaran type part in the hull, and the property of the small high speed boat is determined. However, according to the test by the inventors, as described in claim 2, it is preferable that the length of the catamaran is two-thirds or less of the entire length of the hull and the hydrofoil is provided between them. Further, the load sharing ratio of the hydrofoil at the designed ship speed is preferably 70% or less of the total weight of the boat. This is because the characteristics shown in a), b), and c) above are properly balanced, and stability and sports characteristics suitable for small high-speed boats for leisure and the like are provided.

Further, by defining the shape of the catamaran according to claim 3 and changing the horizontal cross-sectional area, the restoring force of the hydrofoil is large and the restoring force of the catamaran portion is small. Lateral stability can be satisfied at the same time at rest or at low speed, where the stability of stability is not expected. This is because the two left and right parts, which are the catamaran, generate large buoyancy and lift as they are deeply immersed in the water, and the restoring force against rolling becomes stronger.

[0016]

1 (a) and 1 (b) are perspective views of a small high-speed leisure boat 1 according to a first embodiment of the present invention, with its bottom seen from below.

As shown in the figure, in this high-speed boat 1, the front part of the hull (right side of the figure) is a single-body deep V hull type part 2 (hereinafter,
In addition to the single-hull portion 2), the rear portion is a catamaran boat-shaped portion 3 (hereinafter referred to as the double-hull portion 3), and hydrofoils 4 are bridged between the left and right trunks 3A and 3B of the double-hull portion 3. The shape of the single body portion 2 is not different from that of an ordinary motor boat or the like, but the twin body portion 3 has a tunnel portion as a space, as if the keel 5 was left in the center and a large portion was carved between the body portions 3A and 3B. 6A and 6B are provided on the left and right inside the trunks 3A and 3B.

Each of the bodies 3A and 3B has a length a (see FIG. 1).
(See (a)) is approximately half the entire length of the hull, and the plate is shaped like a downward trapezoid when viewed from the side. In this trapezoidal shape, the length b of the lower side is about one third of the length a of the upper side. Since the length of the single body portion 2 and the length of the double body portion 3 are substantially equal, the deep V
It has both ship type characteristics and catamaran type characteristics. Further, since the two trunks 3A and 3B are trapezoids facing downward and the horizontal cross-sectional area is larger toward the upper side, the restoring force becomes stronger as the hull leans to the left and right, and lateral stability at rest is brought about.

The trunks 3A and 3B are plate-shaped, have a very small bottom area, and do not generate much lift when gliding. Therefore, the hydrofoil 4 is attached to obtain the necessary lift instead. Since the hydrofoil 4 is provided, it is not necessary to obtain a large lift force from the rear part of the ship bottom.
It was possible to make 6B a large space and make the shells 3A and 3B plate-shaped, but as a result, the disadvantages associated with the catamaran form could be reduced. That is, the high-speed boat 1 puts the tunnel portions 6A and 6B on the surface of the water during gliding, and thus has excellent wave-carrying characteristics, is comfortable to ride on, can be banked, and has a small turning resistance, resulting in a turning performance. Will be improved.

The hydrofoil 4 is of a fully submerged type, and has a so-called dihedral angle in which the left and right ends are warped more than the center so as to have self-restoration against rolling. And its shape and dimensions are determined so as to generate a lift of 40 to 60% of the total load of the hull during high-speed gliding (the rest of the load is naturally supported by the lift of the single-body section 2 and the trunks 3A and 3B). ).

2 (a) and 2 (b) show a high-speed boat 11 as a second embodiment of the present invention. These figures are also perspective views of the bottom of the ship as seen from below. Also in this high-speed boat 11, the front portion of the hull is a single-deep deep V boat type portion 12 (hereinafter referred to as the single-hull portion 12), and the rear portion is a catamaran type portion 13 (hereinafter, the double-hull portion 1).
3), and the hydrofoil 14 is installed between the left and right trunks 13A and 13B. In the body section 13, the body 1
There is no difference from the high-speed boat 1 of FIG. 1 in most respects, such as the fact that the tunnel portions 16A and 16B are provided inside the 3A and 13B so as to sandwich the keel 15.

However, in the high-speed boat 11 of FIG. 2, the distribution of the regions of the single-hull portion 12 and the double-hull portion 13 and the lateral view shapes of the barrels 13A and 13B are slightly different from those of the high-speed boat 1. That is, FIG.
The length c of the trunks 13A and 13B shown in (a) is about one-third of the total length of the hull, and the length d of the lower side of the trunks 13A and 13B when viewed from the side is very small (the length d is the length It is substantially equal to the chord length of the hydrofoil 14 at 10% or less of the height c). Side view of the torso 13
This shape of A and 13B can be said to be a trapezoid in a broad sense,
Rather, it looks like an inverted triangle. In this way, the body 1
Since the portions of 3A and 13B that come into contact with the water surface or sink below the water surface become smaller, the high-speed boat 11 is a hull form that is more improved in turning performance than the high-speed boat 1 of FIG. In other words, the high-speed boat 11 has a smaller capacity than the high-speed boat 1 and is characterized as having a stronger sports orientation.

Although two embodiments have been introduced above, the small high-speed boat of the present invention can also be implemented as follows. For example, a) The hydrofoil has a controllable flap to control the bank angle and facilitate turning. The flap may also control the trim angle of the hydrofoil.

(B) Hydrofoils are provided at a plurality of positions after the center of the hull (for example, by shifting the positions back and forth).

C) The hydrofoil is supported by rod-shaped struts, and a part or the whole of the struts have a rudder function to improve turning performance.

D) Unlike the example of FIGS. 1 and 2, the keel portion on the hull centerline in the catamaran is removed. in this case,
If necessary, support the central part of the hydrofoil with struts (see Figure 3).

(E) Although not shown in the embodiment, an outboard motor may be used as a propulsion means for the high speed boat, and a water jet type pump may be installed at the bottom of the ship.

[0028]

EFFECTS OF THE INVENTION The small high-speed boat of the present invention exhibits an excellent balance of stability, sporting property, surging property, riding comfort, etc. based on its boat shape. In other words, this small high-speed boat has 1) longitudinal stability due to the single-deep deep V hull form, 2) lateral stability due to the catamaran hull form, and the effect of reducing wave shock, 3) hydrofoil installation It is possible to appropriately provide the following characteristics such as follow-up / transverse wave middle characteristics and sportiness by reducing the size, 4) vertical movement by the hydrofoil itself, damping force for pitching, popoise prevention action, self-restoration against roll- it can.

In particular, the small-sized high-speed boat according to claim 2 is particularly preferable as a small-sized high-speed boat for leisure purposes in view of the balance of the above characteristics.

Further, in the small-sized high-speed boat according to the third aspect, the lateral stability of the hull at rest or at low speed is high.

[Brief description of drawings]

1 (a) and 1 (b) are perspective views showing a bottom of a small boat for leisure 1 according to a first embodiment of the present invention as seen from below.

2 (a) and 2 (b) are perspective views of a small high-speed leisure boat 11 for leisure, which is a second embodiment of the present invention, when the bottom of the boat is viewed from below.

FIG. 3 is a perspective view of another embodiment.

4 (a) and (b) are front views showing a hull of a conventional general high-speed boat.

[Explanation of symbols]

 1/11 Small high-speed boat 2/12 Single body part (deep V ship type part of single body) 3.13 Catamaran part (catamaran type part) 4/14 Hydrofoil

Claims (3)

[Claims] 1. A deep V hull with a single body at the front of the hull and a twin-hull (or tri-hull) hull at the rear of the hull,
A small high-speed boat characterized by having a dihedral hydrofoil having a dihedral angle between its catamaran. 2. The small high-speed boat according to claim 1, wherein each length of the catamaran is two-thirds or less of the entire length of the hull. 3. The shape of the catamaran viewed from the side is a trapezoid in which the length of the lower side with respect to the upper side is two-thirds or less.
Or the small high-speed boat described in 2.