Patent ID: 7381109
Filing Date: 2008-06-03
Classification: B63B,B63H,Y02T

Abstract:
1. A watercraft comprising: two pairs of rotatively driven active hulls and one pair of stationary hulls in a longitudinal configuration with right and left symmetry that consists of a frontal pair of rotatively driven active hulls, each active hull having an axis of rotation positioned forty five degrees relative to the horizontal and projected laterally from the center line of the watercraft and each active hull being of a conical frustum design, with a planar end wall toward the said center line, a pair of stationary hulls longitudinally following the frontal pair of rotatively driven active hulls, each stationary hull having two longitudinal walls, one being a vertical wall which is the side wall located at the extreme lateral position of the pair of stationary hulls, the other being a slanted wall coplanar with the planar end wall of the active hull preceding, and each stationary hull having two lateral curved walls, the one in front being a curved surface that follows in proximity the curved surface of the rotatively driven active hull preceding, and the one in back being a curved surface that is symmetrical to the front one relative to the lateral center line of the stationary hull, and a rear pair of rotatively driven active hulls that is identical to the frontal pair.