Patent ID: 8028636
Filing Date: 2011-10-04
Classification: B63B,B63H,Y02T

Abstract:
1. A stern of a displacement-type marine vessel which travels in a velocity range which is below a velocity at which resistance is at its highest value, the stern comprising two knuckle lines respectively disposed on two sides of a hull of the vessel, each knuckle line being configured such that: the knuckle line extends from a starting point in front of a propeller to an end point behind the propeller; a first portion of the stern is disposed outwardly of the knuckle line relative to the propeller in a width direction of the stern, the first portion of the stern having a convex curvature; and a second portion of the stern is disposed inwardly of the knuckle line relative to the propeller in a width direction of the stern, the second portion of the stern being formed into a dome shape having a concave curvature, wherein a length of the second portion having the dome shape is at least 10% of an entire length of the hull of the vessel or at least as long as a diameter of the propeller, and wherein the starting point of the knuckle line is positioned outside a radius of the propeller in the width direction of the stern, and wherein the end point of the knuckle line is spaced apart from the end point of the other knuckle line on the other side of the hull.