JP3804044B2 - Small ship hull - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure of a hull for a small vessel, and more particularly to a configuration of a bottom shape of the hull.
[0002]
[Prior art]
Conventionally, as shown in FIGS. 9 and 10, fishing boats generally have a boat shape having a flat keel 103 formed on the bottom 102 of the hull 101 and a narrow boat width W1.
Further, the ship bottom shape has a shape in which the central portion in the left-right direction protrudes downward due to the relationship of the engine mounting position, and the sliding surface 104 is twisted in the front-rear direction.
[0003]
That is, as shown in FIG. 11 and FIG. 12, the bottom slope angle b of the sliding surface 104 at the substantially front and rear central part of the hull 101 is compared with the bottom slope angle a of the sliding surface 104 at the substantially front and rear rear end of the hull 101. Then, the ship bottom gradient angle b at the center is formed larger than the ship bottom gradient angle a at the rear end.
The hull form formed in this way can sit on a moored area that is not maintained, and has a synergistic effect that the ship width W1 is narrow in the low ship speed range, which is very moderate and very stable. The boat is easy to fish.
[0004]
On the other hand, the leisure type hull form is a wide V hull form with emphasis on high ship speed and cabin space. That is, as shown in FIGS. 13 and 14, the width W2 of the hull 111 is widened and the sliding surface 114 of the bottom 112 is less twisted in order to quickly reach the high ship speed region beyond the last hump region. It is a flat V shape.
[0005]
In this case, increasing the punching impact resulting from the wide width W2 for securing the cabin space is to increase the V angle (the bottom slope angle c shown in FIG. 15 and the bottom slope angle d shown in FIG. 16). In addition, the cover is provided by eliminating the flat keel 103 formed on the fishing boat. On the other hand, since the ship width W2 is wide, the needle-keeping performance is lowered, and the absence of the flat keel 103 makes it impossible to sit on the beach, forcing a marine mooring.
[0006]
In addition, as shown in FIG. 17, in some cases, skegs are provided from the bow side toward the rear on the bottom of the ship in order to reduce the needle retention and the lateral flow due to wind.
[0007]
[Problems to be solved by the invention]
However, the fishing boat type hull constructed as described above has resistance due to the twisting of the running surface, so it has a large effect on the boat speed and the start-up performance during acceleration, and in some cases the trim angle during hump increases. As a result, the forward visibility deteriorated and it took time to reach the top speed.
[0008]
In addition, the leisure type hull has less twisting of the running surface and a relatively small trim angle at the time of humping. Sitting is impossible.
[0007]
[Means for Solving the Problems]
The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described.
[0010]
A skeg 5 is formed at the front keel of the bottom 2 from the bow to the stern, and a flat keel 3 is formed at the rear keel of the bottom 2, and the flat keel 3 is cut upward as it goes rearward. Raised, formed wider on the rear side than the front side, and has the shape of the bottom 2 where the front end portion of the flat keel 3 and the rear end portion of the skeg 5 overlap, and overlap In the range RL, both the skeg 5 and the flat keel 3 are formed, and the rear portion of the sliding surface 4 of the bottom 2 of the hull 1 has a V-shaped shape having a predetermined bottom slope, The slope of the bottom 2 is substantially the same depending on the position, and the skeg 5 is formed in a push-out shape protruding forward and downward from the bottom 2 .
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described.
1 is a side view showing a small vessel having a hull of the present invention, FIG. 2 is a bottom view of the same, FIG. 3 is a perspective view of the same as seen from the bottom of the vessel, and FIG. FIG. 5 is a diagram showing a BB cross section of the hull in FIG. 1, FIG. 6 is a diagram showing a difference in trim angle during navigation between a conventional fishing boat type vessel and a vessel having the hull of the present proposal, FIG. Fig. 8 is a diagram showing the output required to obtain the speed of a conventional fishing boat type vessel and a vessel having the proposed hull, and Fig. 8 is a graph showing the center of gravity of the conventional fishing vessel type vessel and the vessel having the proposed hull. FIG. 9 is a side view showing a conventional fishing boat type ship, FIG. 10 is a bottom view, FIG. 11 is a cross-sectional view taken along line AA of FIG. 9, and FIG. FIG. 13 is a side view showing a conventional leisure-type ship. 14 is a bottom view, FIG. 15 is a view showing a cross section AA of the hull in FIG. 13, FIG. 16 is a view showing a BB cross section of the hull in FIG. 13, and FIG. It is a side view which shows a leisure type ship.
[0012]
The structure of the small ship hull of the present invention will be described.
A flat keel 3 is formed in a range Ra from the middle part in the front-rear direction to the rear end of the keel part of the ship bottom 2 in the hull 1 of the small boat shown in FIGS. The flat keel 3 is formed in a planar shape substantially parallel to the horizontal plane, and is raised upward as it goes rearward. The rear side is wider than the front side.
[0013]
Further, the sliding surface 4 of the ship bottom 2 in the range Ra of the rear portion of the hull 1 where the flat keel 3 is formed is formed in a V shape having a predetermined gradient in a rear sectional view. The V-shaped gradient angle at the bottom 2 is an angle e as shown in FIG. 4 at the rear in the range Ra, and an angle f at the front within the range Ra as shown in FIG. It has become.
[0014]
The front angle f is formed to be slightly larger than the rear angle e, but there is not much difference between the two angles, and the rear portion of the ship bottom 2 within the range Ra is less twisted.
[0015]
On the other hand, a skeg 5 is formed in the keel part at the front part of the ship bottom 2 from the bow part to the stern direction. The skeg 5 is formed in a pick-up shape that protrudes forward and downward from the ship bottom 2.
The skeg 5 is formed within the range Rb from the front end of the ship bottom 2 toward the rear.
[0016]
The rear end portion of the skeg 5 formed at the front portion of the ship bottom 2 and the front end portion of the flat keel 3 formed at the rear portion of the ship bottom 2 are crossed.
That is, the rear end portion of the range Rb where the skeg 5 is formed and the front end portion of the range Ra where the flat keel 3 is formed overlap, and in this overlapping range RL, Both the flat keel 3 are formed.
[0017]
In this way, the hull resistance at the time of sliding is reduced by forming a ship bottom shape in which the rear end of the skeg 5 formed at the front of the ship bottom 2 and the front end of the flat keel 3 formed at the rear of the ship bottom 2 cross. It will be smaller and will be able to navigate at higher speeds.
Moreover, the trim change at the time of sailing can be reduced, and the hull 1 that is easy to ride and has little punching impact can be configured.
[0018]
In particular, the rear part of the ship bottom 2 is formed in a V-shaped hull with a certain degree of inclination angle and little twist, so that the trim change at the time of rising can be reduced, the resistance at the maximum ship speed can be reduced, Ship speed is possible.
[0019]
In addition, because the keel at the front part of the bottom 2 is formed with a pinch-shaped skeg, the lateral projection area of the flooded part can be increased to prevent lateral flow, and punching impact mitigation and wave surpassing properties can be achieved. Improvement.
[0020]
For example, as shown in FIG. 6, in the small boat of the present plan, the trim angle at the time of start-up at the time of sailing is reduced as compared with the conventional fishing boat type vessel, and the forward visibility can be improved. At the same time, the time to reach the top speed can be shortened.
[0021]
In addition, as shown in FIG. 7, the small boat of the present plan reduces the resistance at the maximum boat speed and enables high boat speed and improves the traveling performance like the conventional leisure type vessel. The output required to obtain the boat speed is the same as that of a conventional fishing boat type ship, so the boat speed does not decrease.
[0022]
Furthermore, as shown in FIG. 8, the small boat of this proposal can reduce the vertical acceleration (punching impact acceleration) at the position of the center of gravity as compared with the conventional fishing boat type vessel.
The degree of reduction in the vertical acceleration is, for example, 7.5% when the boat speed is 25 knots and the wave height is 50 cm.
[0023]
Moreover, since the flat keel 3 is formed in the keel part at the rear part of the ship bottom 2, as well as a conventional fishing boat type ship, not only can it be moored at a marina, but also can be stored on the beach and transported easily. It can be done easily.
[0024]
As described above, the hull 1 of the present ship is formed into a hull shape that mixes a fishing boat type hull shape with a leisure type high speed hull shape and takes advantage of both advantages.
In the ship of this plan, the thrust direction of the thrust of the propulsion device such as outdrive is brought closer to the hull's center of gravity, thereby reducing the vertical rotation moment and further reducing the trim angle at the time of hump for safe front view. It can be secured.
[0025]
【The invention's effect】
As described above, the present invention forms the skeg 5 from the bow portion to the stern direction at the front keel portion of the bottom 2 and the flat keel 3 at the rear keel portion of the bottom 2. upper up cut into toward the rear, wider form towards the rear side than the front side, it has a front end portion of the flat Tokiru 3, the shape of the ship bottom 2 to a rear end portion overlapping the skeg 5 In the overlapping range RL, both the skeg 5 and the flat keel 3 are formed, and the rear portion of the sliding surface 4 of the bottom 2 of the hull 1 has a V-shaped shape having a predetermined bottom slope. In addition to the shape, it has a low twist shape in which the slope of the ship bottom 2 is substantially the same depending on the position in the front-rear direction, and the skeg 5 is formed in a pinching shape that protrudes forward and downward from the ship bottom 2, so that the following effects Because I play That.
That is, a flat keel is formed at the keel portion at the rear of the ship bottom, and a skeg extends from the bow portion to the stern direction at the keel portion at the front of the ship bottom, and the front end portion of the flat keel and the rear end portion of the skeg are connected to each other. Since they have overlapping ship bottom shapes, the hull resistance at the time of sliding is reduced, and it becomes possible to sail at high ship speeds.
Moreover, the trim change at the time of sailing can be reduced, and a hull that is easy to ride and has little punching impact can be configured.
[0026]
Further, the rear part of the ship bottom running surface in the hull has a V-shaped shape having a predetermined ship bottom slope and a low twist shape in which the ship bottom slope is substantially the same depending on the position in the front-rear direction. This makes it possible to reduce the resistance at the maximum boat speed and to increase the boat speed.
[0027]
In addition, the flat keel has a shape that rises upward as it goes backwards, so that it is possible to sail at high ship speeds, and it can be stored on the beach while minimizing trim changes during sailing. Also, the transportability can be improved.
[0028]
Furthermore, since the skeg is formed in a protruding shape that protrudes forward and downward, the lateral projection area of the flooded portion can be increased to prevent lateral flow, and punching impact mitigation and wave surpassing improvement can be achieved. Can be planned.
[Brief description of the drawings]
FIG. 1 is a side view showing a small vessel having a hull of the present invention.
FIG. 2 is a bottom view of the same.
FIG. 3 is a perspective view of the state as seen from the bottom side of the ship.
4 is a view showing a cross section AA of the hull in FIG. 1; FIG.
FIG. 5 is a view showing a BB cross section of the hull in FIG. 1;
FIG. 6 is a diagram showing the difference in trim angle during navigation between a conventional fishing boat type vessel and a vessel having the hull of the present proposal.
FIG. 7 is a diagram showing an output necessary for obtaining a boat speed of a conventional fishing boat type vessel and a vessel having the hull of the present proposal.
FIG. 8 is a diagram showing a difference in vertical acceleration at a center of gravity position between a conventional fishing boat type ship and a ship having the hull of the present plan.
FIG. 9 is a side view showing a conventional fishing boat type ship.
FIG. 10 is a bottom view of the same.
11 is a view showing a cross section AA of the hull in FIG. 9;
12 is a view showing a BB cross section of the hull in FIG. 9. FIG.
FIG. 13 is a side view showing a conventional leisure-type ship.
FIG. 14 is a bottom view of the same.
FIG. 15 is a view showing an AA cross section of the hull in FIG. 13;
16 is a view showing a BB cross section of the hull in FIG. 13;
FIG. 17 is a side view showing a conventional leisure-type ship in which a skeg is formed.
[Explanation of symbols]
1 Hull 2 Ship Bottom 3 Flat Keel 4 Running Surface 5 Skeg

Claims (1)

A skeg 5 is formed at the front keel of the bottom 2 from the bow to the stern, and a flat keel 3 is formed at the rear keel of the bottom 2, and the flat keel 3 is cut upward as it goes rearward. Raised, formed wider on the rear side than the front side, and has the shape of the bottom 2 where the front end portion of the flat keel 3 and the rear end portion of the skeg 5 overlap, and overlap In the range RL, both the skeg 5 and the flat keel 3 are formed, and the rear portion of the sliding surface 4 of the bottom 2 of the hull 1 has a V-shaped shape having a predetermined bottom slope, A hull for a small vessel, characterized in that it has a low twist shape in which the gradient of the ship bottom 2 is substantially the same depending on the position, and the skeg 5 is formed in a push-out shape protruding forward and downward from the ship bottom 2 .

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