Ships – Hull or hull adjunct employing fluid dynamic forces to... – Having hydrofoil
Patent
1989-07-10
1991-03-26
Swinehart, Ed
Ships
Hull or hull adjunct employing fluid dynamic forces to...
Having hydrofoil
114 61, B63B 124
Patent
active
050020048
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a planing boat which skims over the surface of water at high speeds.
BACKGROUND ART
Generally, in a single-hull type planing boat, as the speed of the boat increases, the center of lift shifts too much toward the stern with respect to the center of gravity, causing a porpoising and a large pitching, making the traveling unstable.
On the other hand, in a 3-point-support type planing boat whose forepart is supported by two planing portions and its afterpart is supported by one planing portion, the center of gravity is located between three front and rear lifts even when the speed of the boat increases. This prevents a porpoising and a large pitching, realizing a stable planing on the surface of water.
In the latter type, however, since the number of planing portions in the forepart of the hull is greater than that in the afterpart, the ability of making a turn is degraded. Another drawback is that since only one planing portion is provided in the afterpart, it is difficult to mount two or more engines. Furthermore, there is a limitation in the arrangement of the cabin space.
DISCLOSURE OF THE INVENTION
This invention has been accomplished with a view to overcoming the abovementioned drawbacks. The object of the invention is to provide a planing boat that can realize a stable high-speed skimming over the surface of water and which has an improved performance of advancing straight ahead and making a turn and an improved sea kindliness, compared with the conventional 3-point-support type planing boat.
Another object of the invention is to provide a planing boat which can mount a plurality of engines and has reduced restriction in the arrangement of cabin space.
The planing boat of this invention is characterized in comprising: the rear hull portion being formed with a recess, the recess opening downwardly from the bottom part of the rear hull portion, the recess also opening rearwardly from the stern, the rear hull portion having a plurality of bottom parts on the left and right side of the recess; portion; and parts of the rear hull portion.
The planing boat of this invention with the above construction has the following advantages. plurality of rear planing portions in the rear hull portion improves the course keeping performance over the conventional 3-point-support type glide boat. keel effect of the stern assures a good overall turning performance. the skeg effect of the stern also improves the course stability in following seas. hull portion, a plurality of engines can be mounted. the conventional 3-point-support type planing boat.
In this invention, it is desirable to provide a step to the rear end of the front planing portion to reduce the water contact area as much as possible and therefore the influence of waves.
It is also desired that front fins be provided to each side of the front hull portion to generate lift for floating the hull.
Further, by providing the lift generating fins to the rear hull portion as well as to each side of the front hull portion, it is possible to further reduce the depth of the draft when the boat is running at high speeds.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGS. 1A and 1B are schematic views showing the characteristic of a single-hull type planing boat;
FIGS. 2A and 2B are schematic views showing the characteristic of a conventional 3-point-support type planing boat with two support points at the forepart of the hull and one support point at the afterpart;
FIG. 3 is a side view of the planing boat as a first embodiment of the invention;
FIG. 4 is a bottom view of FIG. 3;
FIG. 5 is a front view of FIG. 3;
FIG. 6 is a back view of FIG. 3;
FIG. 7 is a perspective view showing the state of the planing boat while it is running at a high speed;
FIG. 8 is a bottom view showing the essential portion of the planing boat as a second embodiment of the invention;
FIG. 9 is a back view of FIG. 8;
FIG. 10 is a bottom view showing essential portions of the planing boat as a third embodiment of the invention;
FIG. 11 is a bottom view sh
REFERENCES:
patent: 2269801 (1942-01-01), Willrich, Jr.
patent: 2397683 (1946-04-01), Nelson
patent: 3469549 (1969-09-01), Rae
patent: 3477400 (1969-11-01), Walker
patent: 3650239 (1972-03-01), Gast
patent: 3763810 (1973-10-01), Payne
patent: 4609360 (1986-09-01), Whitehead
patent: 4665853 (1987-05-01), Gerdsen et al.
patent: 4689026 (1987-08-01), Small
patent: 4748929 (1988-06-01), Payne
patent: 4915668 (1990-04-01), Hardy
Kunitake Yoshikuni
Kurihara Kazuaki
Nojiri Takeo
Mitsui Engineering & Shipbuilding Co. Ltd.
Swinehart Ed
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