Stern shape of displacement-type marine vessel

Details Stern shape of displacement-type marine vessel Stern shape of displacement-type marine vessel

2008-01-30

2011-10-04

Olson, Lars A (Department: 3617)

Ships

Displacement-type hull

Screw propeller type

Reexamination Certificate

active

08028636

ABSTRACT:
A stern shape of a displacement-type marine vessel enables reduction of the hull resistance and prevents propeller cavitation. The displacement-type marine vessel which travels in a velocity range in which the Froude number is smaller than the last hump and the stern includes knuckle lines connecting knuckle points provided on the surface of the hull, from a starting point in front of a propeller to an end point behind the propeller. A portion of the stern located inside the knuckle line in the direction of the width of the hull has a dome shape with upward curvature, and the length of the portion which has the dome shape is set to 10% or more of the entire hull length or at least the diameter of the propeller.

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International Search Report mailed May 13, 2008 for International Application No. PCT/JP2008/051389.
Extended European Search Report issued Jun. 1, 2011 in corresponding European Patent Application No. 08704156.2.

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