초록 ▼

A planing hull for high speed water-craft polysectionally contoured to provide a simple deep vee bow section that develops functionally from a compound vee section to a flattened base at the step-lift having controlled air film supply to break the step-lift generated vacuum and to provide an air fil

A planing hull for high speed water-craft polysectionally contoured to provide a simple deep vee bow section that develops functionally from a compound vee section to a flattened base at the step-lift having controlled air film supply to break the step-lift generated vacuum and to provide an air film support and pathway for a trailing-and-air-film-confining hull portion after the step-lift.

대표청구항 ▼

A watercraft of the step-lift planing type comprising: at least one hull having an intermediate step-lift at its bottom; an at least generally flat bottom hull portion aft of the step-lift, the underside of which is at least generally parallel to the water level; air channel means extending through

A watercraft of the step-lift planing type comprising: at least one hull having an intermediate step-lift at its bottom; an at least generally flat bottom hull portion aft of the step-lift, the underside of which is at least generally parallel to the water level; air channel means extending through the hull to and communicating with the step-lift area through an opening for producing an air stream vacuum break at the step-lift and a thin, substantially non-propulsive, relatively low pressure and velocity air film along substantially all of the bottom of the aft hull portion, said air channel means being substantially free of any mechanical pressure inducing means; retaining means comprising a pair of elongated, relatively narrow, edge protrusions located along each port and starboard edge of the hull at the bottom thereof and extended aft at least generally parallel to the hull and at least generally parallel each to the other from the step-lift area to the stern, the lower tip of each edge protrusion extending vertically downward beyond the bottom of said flat hull portion a very short distance to contact the surface of the water when the watercraft is underway and on plane, said retaining means and said bottom hull portion forming aft hull air film confining means to retain said thin film of air beneath substantially all the entire area of the hull aft the step-lift, said film of air being confined above by the bottom of said aft hull portion, confined below by the surface of the water, and confined laterally by the said pair of elongated protrusions, but having unimpeded egress at the stern.