Ships – Hull or hull adjunct employing fluid dynamic forces to... – Having fluid channeling or entrapping configuration
Patent
1997-02-12
1999-08-10
Swinehart, Ed L.
Ships
Hull or hull adjunct employing fluid dynamic forces to...
Having fluid channeling or entrapping configuration
114290, B63B 132
Patent
active
059342188
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to boats and ships, and more particularly, to a planning vessel.
BACKGROUND OF THE INVENTION
Typical displacement ships have good stability to meet the needs for various cargo tonnage. However, when a displacement ship carries more cargo, its hull draft becomes high. An increased draft can cause more water resistance during the ship movement which, in turn, leads to more power consumption and thus makes it difficult to increase its speed and improve its performance.
Hydrofoil crafts can reduce a large portion of water resistance and, therefore, enhance their travel speed. However, Hydrofoil crafts have low load capability and poor seaworthiness.
Surface effect crafts, such as hovercrafts, can reduce water resistance and thus increase their travel speed. However, surface effect crafts are unable to use the hydrodynamic buoyancy to support their weight. Moreover, a large amount of power has been consumed in order for them to generate dynamic air cushion. Further, their advantages can all disappear when there is a raid of lateral wind.
Typical planing boats have low draft in planing state and therefore can have an increased travel speed. They usually adopt a deep or a shallow V-shaped hull to improve the moving stability and lateral stability. However, a planing boat has dihedrals on its hull. Hence, the wet area at the hull bottom and splash at both boards increase to cause more water resistance. Moreover, a planing boat usually rides at an angle relative to the water surface with its bow up high and its stem low, which can further increase water resistance and induce bounce and pitching when traveling at a high speed or on rough waters. Certain improved planing boats, as disclosed in U.S. Pat. Nos. 5,265,554, 5,016,552, 5,231,949, 4,722,294, etc., adopt a shallow V-shaped hull or partly deep-V bottom to acquire certain merits. However, the performance of such improved planing boat are still similar to those V-shaped bottom planing boats. The improvements are very limited.
Sea-knife boats can be one kind of planing boats. They have faster speed and better performance in storms than other planing boats. However, sea-knife boats have triangular plane hull bottoms, which results in reduced stability and poor operative function.
SUMMARY OF THE INVENTION
In order to overcome the problems existing in conventional boats and ships to improve the performance of boats and ships, the present invention provides a novel planing vessel which comprises a hull and a propulsion and control system. The hull consists of a bottom, two boards, a deck, one or more swell guideways, a pair of wave-splash guards, cabin and upper constructions. The bottom is composed of an equicrural triangle portion in the front and a rectangle portion at the back. One or more swell guideways are provided at the bottom denting upwardly into the space between the bottom and deck and extending through the entire length of the bottom. The swell guideways are symmetrical and parallel to a centerline at the bottom. When there is only one swell guideway, its bottom centerline coincides with the centerline of the bottom. Each swell guideway opens downwardly, forwardly and backwardly. The cross section of each swell guideway is a or or -shaped. The longitudinal section of the swell guideway is -shaped, whose top line is inclined with a lower front and a higher back. Wave-splash guards are provided on the boards below the deck and above the bottom. Wave-splash guards are inclined baffles with a lower front and a higher rear. They can be inlaid onto boards or dented thereinto to form integrated boards.
The planing vessel hull so formed can generate the hydrodynamic flow field and corresponding sufficient hydrodynamic buoyancy with reasonable distribution as designed during its movement. Thus, the vessel hull can reduce water resistance to increase its travel speed. In the mean time, the vessel hull can use the hydrodynamic buoyancy generated during its movement to increase the load capability so as t
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