초록 ▼

Hydrocraft, capable of maintaining comfortable seaworthy performance at both low and high speeds, in both calm and rough seas, wherein its hull form coordinates high efficiency of at least two zero deadrise planing surfaces with a wave piercing, wedge effect bow segment. The forward portion of the r

Hydrocraft, capable of maintaining comfortable seaworthy performance at both low and high speeds, in both calm and rough seas, wherein its hull form coordinates high efficiency of at least two zero deadrise planing surfaces with a wave piercing, wedge effect bow segment. The forward portion of the respective concave sides of the bow intersect at the centerline of the hull. The sides of the forward body of the hull rise from the bottom at the chine, vertically then upwardly and outwardly in a concave curvature, the form of which will load the side skin in tension. At a preselected point above the hull bottom, the sharp edged bow is truncated in a conical, forward sloping surface to provide an upward hydrodynamic force to lift the hull over waves which are higher than the gunwale. The parallel after body is located above the after planing surface, and a conical transom closes the stern. The two zero deadrise planing surfaces, of fluted section will present a positive angle of attack to the water surface when the hull has a zero angle of trim. The craft planing surfaces are step connected.

대표청구항 ▼

A power boat for calm and rough water, capable of efficient, comfortable, seaworthy performance at both slow and fast speeds, through both calm and rough seaways, having a monocoque forebody and afterbody hull construction, comprising in combination. (a) vertical hull sides which are continuously an

A power boat for calm and rough water, capable of efficient, comfortable, seaworthy performance at both slow and fast speeds, through both calm and rough seaways, having a monocoque forebody and afterbody hull construction, comprising in combination. (a) vertical hull sides which are continuously and smoothly of concave curvature from the bottom to the gunwale, the sides of the forebody having greater curvature than sides of the afterbody, wherein both the monocoque construction and curvature provide a stiff and efficient hull structure, said forebody being of wedge-shaped concavity and having an after edge which is terminated vertically and forwardly by an arcuate knuckle between chine and gunwale, said forebody including a bow wherein a sharp concave fairbody line is defined by a default resultant of geometric intersection of respective forebody sides, joining together at an included angle of between 10 and 30 degrees, said fairbody line terminating at its upward extremity in a forward sloped safety transom, the resultant stiffness and weight efficiency of the forebody providing strength to pierce seaways at fast speeds; (b) an afterbody joined to the rear of the forebody, said afterbody having concave sides which create as a portion of said knuckle a sharp-edged corner which is a default resultant of geometrical intersection of the concave forebody sides with the concave afterbody sides, said afterbody sides being parallel to the centerline of the hull and terminating in a vertically offset rear transom, said afterbody providing an internal volume for propulsion and payload while improving static stability; (c) a substantially planar, zero-degree deadrise bottom of forebody and afterbody comprising tandem forward and after planing surfaces which project below a baseline of the hull construction, each defining a single-sided strutless foil, the planing surfaces extending the full width of the hull, and presenting an angle of attack to the water between 5 and 10 degrees when the hull is at zero angle of trim, the respective planing surfaces being disposed forward and aft the overall hull center of gravity, each being offset from the other whereby both may be in concurrent contact with the seaways; (d) an intermediate bottom division step between the tandem foils whereby the summation of the moments of hull mass, propulsion thrust, hydrodynamic lift and drag, and aerodynamic drag are equal to zero about a point which is immediately aft of the forward foil.