초록 ▼

An unventilated, stepped hydroplaning boat hull has at least one midship step. Two separated wetted planing surfaces are thereby established--a forward surface just forward of the step and an aft surface just forward of an aft edge of the hull. The angles of attack of each planing surface preferably

An unventilated, stepped hydroplaning boat hull has at least one midship step. Two separated wetted planing surfaces are thereby established--a forward surface just forward of the step and an aft surface just forward of an aft edge of the hull. The angles of attack of each planing surface preferably lie in the range 2.0-6.5 degrees, and are preferably equal. The midship step is preferably located longitudinally in a range of 0.45 to 0.51 times the projected chine length of the hull, measured aftward from a forwardmost point of the chine.

대표청구항 ▼

An unventilated, stepped hydroplaning boat hull has at least one midship step. Two separated wetted planing surfaces are thereby established--a forward surface just forward of the step and an aft surface just forward of an aft edge of the hull. The angles of attack of each planing surface preferably

An unventilated, stepped hydroplaning boat hull has at least one midship step. Two separated wetted planing surfaces are thereby established--a forward surface just forward of the step and an aft surface just forward of an aft edge of the hull. The angles of attack of each planing surface preferably lie in the range 2.0-6.5 degrees, and are preferably equal. The midship step is preferably located longitudinally in a range of 0.45 to 0.51 times the projected chine length of the hull, measured aftward from a forwardmost point of the chine. second expandable fluid-containing cell and into said at least a first expandable fluid-containing cell, said first expandable fluid-containing cell expands, thus causing the hydraulic actuator to contract longitudinally while expanding latitudinally thereby causing at least two of said connection elements to move substantially toward each other. 16. The hydraulic actuator of claim 15, wherein both said first displaceable containment-wall and said second displaceable containment-wall are implemented as flexible walls. 17. The hydraulic actuator of claim 15, wherein said second displaceable containment-wall is implemented as a cylindrical wall of a piston