JPS59130796A - Inflation type boat - Google Patents

Abstract

PURPOSE:To reduce the resistance on sliding by installing a projection along the boundary between the conical part at the rear edge of a cylindrical part and forming the outer peripheral rear edge part of said projection into an acute angle, thus eliminating the contact of the conical part to the water surface in high-speed sliding and facilitating the transition to sliding state. CONSTITUTION:As for a boat 1, the floating bodies 2 on the both sides of a hull are connected by a ship bottom plate 3 and a transom 4, and the bow part of the floating body 2 are brought close to each other and united at the bow edge. A cover 5 and a wind shield 50 are installed at the bow part. The floating body 2 is formed of a rubber bag body, and each shape of an inner cylindrical part 20 and the conical part 6 at the rear edge of the inner cylindrical part is maintained. At the rear edge of the cylindrical part 20, a projection 7 made of plastic or rubber is installed along the boundary between the conical part 6, and the outer peripheral rear edge part of the projection 7 is formed into an acute angle.

Description

[Detailed description of the invention] This invention relates to improvements in inflatable bows 1 to 1.

Conventionally, an inflatable boat is known in which cylindrical floating bodies on both sides of the ship are connected to each other by a bottom plate and a transom, and a conical protrusion is formed at the rear end of the floating body. When this boat is equipped with a high-horsepower engine and runs at high speed, a phenomenon occurs in which the bow is pushed up when it enters a planing state, and at this time water dt flows along the conical part of the stern, and the lower part of the conical part This creates a negative pressure on the stern, which acts as a force to lower the stern and further lift the bow, which increases resistance and makes it difficult to shift to a planing state.

Also, is it a circle even after moving to a sliding state? The contact of the IE section with the water surface increases the resistance.

This invention was made in order to eliminate these conventional drawbacks, and it prevents the conical part from coming into contact with the water surface during downhill speed, thereby making it easier to transition to a gliding state and reducing the resistance during gliding. It was made so that it would become so.

Specifically, in this invention, a protrusion is arranged along the boundary between the rear end of the cylindrical part and the conical part, and the rear end of the outer periphery of this protrusion is formed at an acute angle, so that water is drained by this protrusion. be.

Embodiments of the present invention will be described below with reference to the drawings. 1st
4, a boat 1 has floating bodies 2 on both sides connected to each other by a bottom plate 3 and a transom 4, and the bow portions of the floating bodies 2 approach each other and are integrated at the bow end.

A cover 5 and a windshield 50 are provided at the bow.

The floating body 2 is formed of a rubber bag, and the shape of the cylindrical part 20 and the conical part 6 at the rear end is maintained by filling the inside with air. The bottom plate 3 is reinforced with ribs (not shown) so as to maintain the V-shape as shown in FIG.

Also, at the rear end of the cylindrical part 20, a protrusion 7 made of plastic, rubber, etc. is provided along the boundary with the conical part 6,
The rear end of the outer periphery of this protrusion 7 is formed at an acute angle. The drawing shows an example in which the protrusion 7 is formed on the lower half of the rear end of the cylindrical part, or the part in contact with the transom 4 is necessarily provided with the protrusion 7 (
), and a protrusion may also be provided at the lower end of the 1-ransom 4.

The shape of the protrusion may be such that it functions to separate from the hull at the water surface 8 or the tip of the protrusion when the boat is running; for example, it may be formed by a plate-shaped member protruding downward from the stern as shown in Fig. 5. .

The present invention will now be described in detail. Conventionally, as shown in Figure 6, when a ship increases in speed, the bow of the ship rises significantly, increasing resistance. This is at the stern of the ship, where waterline 9 is drained in the 1-ransom lower pant, but on both sides, the circle &lf
The stern part is sucked in so that the water surface 8 comes into contact with the part 6, and this
This is because it acts to lift up the ship's hull. On the other hand, in this invention, in order to drain the water from the protrusion 7 provided at the rear end of the cylindrical part of the floating body, the water surface 8 is formed by dividing the circle i+ into a part G.
Contact t! As a result, a force that lowers the stern section downwards is generated, and the bow section is not easily lifted up. 3. Therefore, it is easy to shift to a planing state, and even if J3 is in a planing state, the angle between the bottom and the rim relative to the water surface is small, so the resistance is small.

As explained above, this invention forms a drainage protrusion on the rear end of the floating body to prevent the water surface from coming into contact with the conical part, and also reduces resistance in the sliding state. It's small.

[Brief explanation of drawings]

Fig. 1 is a plan view showing an embodiment of the present invention, Fig. 2 is a side view thereof, Fig. 3 is a cross-sectional view thereof, Fig. 4 is a longitudinal sectional view of the stern part, and Fig. 5 is a plan view of the stern part. Fig. 6 (△) is a side view of the conventional structure in a sliding state;
FIG. 2 is a side view of the present invention in a sliding state. 1... Bow]~, 2... Floating body, 4... Transom, 6... Conical part, 7, 70... Protrusion, 20... Cylindrical part. Patent H'l applicant A7 Maha Koki Co., Ltd. agent Patent attorney Etsushi Kotani, r□7＋＼・, Niichi. 15, : ・ ,'- ゝ (Shishi 1' Figure 1 Figure 2 Procedure amendment written format) May 1980 Director of the Noah Japanese Patent Office Kazuo Wakasugi 1, Indication of the case 1988 Patent Application No. No. 6903 No. 2, Name of the invention Inflatable boat 3 Relationship with the case of the person making the amendment Special 3' Applicant name (AO7) Yamaha Motor Co., Ltd. 4 Agent April 26, 1980 QQj 4% of the specification Engraving (no changes to the content)・
-627~

Claims (1)

[Claims] 1. In an inflatable boat in which cylindrical floating bodies on both sides are connected to each other by a bottom plate and a transom, and a conical protrusion is formed at the rear end of the floating body, the conical part at the rear end of the cylindrical part An inflatable boat characterized in that a protrusion is installed along each boundary, and the rear end of the outer periphery of the protrusion is formed at an acute angle.