JPS5926386A - Bow shape - Google Patents

Abstract

PURPOSE:To reduce wave crushing resistance by forming a bow projecting precipitously forward above planned load water line and reducing gradually its width in the horizontal section to sharpen the end of the bow. CONSTITUTION:A bow above planned load water line 4 is shaped to project precipitously long forward right above the water line 4 while reducing graduously its width in the horizontal section to sharpen the end of the bow and form a vertical stem 3. Waves against the bow flow reaward along the surface of hull as thin film to reduce wave crushing resistance without being stripped from the hull and crushed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the shape of the bow of a ship that sails on water, and more particularly to a set with low wave-breaking resistance.

Among the wave-making resistance of ships navigating on water, knowledge of wave-breaking resistance has not advanced until recently, and the shape of the "loaded water line" has not received much attention. For this reason,
The shape of the part that covers the bow wave is not favorable in terms of wave-breaking resistance. In other words, the shape of the waterline surface on the full load waterline is rounded at the tip. The reason for this is that it is difficult to come up with a assembly type with low resistance without changing the length between perpendiculars (Lpp) and overall length (LoA).

The object of the present invention is to provide a set that has lower wave-breaking resistance than before by changing the shape of the bow above the planned full-load waterline without changing the length between perpendiculars and the overall length. be.

For this reason, the configuration of the present invention is such that, in a ship navigating on water, the bow profile from the planned full-load water line protrudes rapidly and long forward just above the water line, and the width in the horizontal section gradually increases. It is characterized by a sharp point at the tip of the bow.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings, while comparing it with a conventional mold.

In FIG. 1, 1 is the bow perpendicular line, 2 is the inclined stem of the conventional assembled type, 5 is the vertical stem of the assembled type of the present invention, and 4 is the planned full-load water line. In addition, in FIG. 2, 5 is the water line 4.
6 is the water line plane of cutting line A in FIG. 1, and 7 is the water line plane of cutting line BB in FIG.

In other words, the conventional assembly pattern is as shown by the broken line in Figure 1!
/(, Ame oblique steno, 2, so as shown by the broken line in Figure 2, the tip of the water line has a large radius, and the bow wave 8 that reaches this part while traveling is This causes breaking waves as shown in part C in Figure 3.

On the other hand, in the shape of the bow of the N1RI invention, as shown by the solid line in FIGS. It is long and protruding, and its width in horizontal section gradually decreases to a sharp point at the tip of the bow. Furthermore, there is no change in the length between perpendiculars (11, ) and the overall length (L, A), which are the same as those of conventional ships. That is, since the front ends of the waterline surfaces 6 and 7 are longer, the tip portions are sharper than in the conventional mold, forming vertical stems 1 and 3. With this shape, as shown by the diagonal line D in Figure 4, the bow wave 8 does not separate from the hull and break as described in Figure 3, but forms a thin film on the hull surface. flows backwards along the In other words, wave breaking resistance is significantly reduced.

In the above description, the stem 6 is shown to be vertical, but the stem 6 may be nearly vertical.

As described above, the shape of the bow of the present invention is such that the bow profile above the planned full-load waterline protrudes forward for a long time immediately above the waterline, and the width in the horizontal section gradually decreases to form the tip of the bow. Since the parts are sharp, it is possible to create a ship with less wave-breaking resistance, with the same perpendicular length and overall length as the conventional assembly type, which has the effect of contributing to saving navigational horsepower.

[Brief explanation of the drawing]

Figure 1 is a side view of the bow, Figure 2 is a plan view of the left half of each water line in Figure 1, Figure 6 is a side view showing the action of the conventional assembly type, and Figure 4 is the invention of the present invention. FIG. 1...Light perpendicular line, 2...Conventional assembled type inclined stem,
5... Vertical stem of the present invention, 4... Planned full load water line, 5, 6, 7. 2. 7ki 1 child 1 beat. 8...Lead acid wave. Cha 3 Senka 4 Town

Claims (1)

[Claims] 1. In a ship navigating on water, the bow profile above the planned full-load water line suddenly protrudes for a long time directly forward of the water line, and the width in horizontal section gradually decreases at the tip of the bow. The shape of the lead acid part is characterized by its sharp point.