Patent ID: 6966804
Filing Date: 2005-11-22
Classification: B63H,Y02T

Abstract:
1. A marine vessel comprising: a hull, a rudder support structure attached to the hull, a rudder device attached to the rudder support structure in a manner allowing pivotal movement of the rudder device relative to the rudder support structure, a first drive train including a first propeller shaft mounted in the hull and extending from the hull, a first propeller unit attached to the first propeller shaft and positioned forward of the rudder device, a second drive train including a second propeller shaft that is mounted rotatably in the rudder support structure, and a second propeller unit attached to the second propeller shaft, said second propeller unit being aft of the first propeller unit and coaxially aligned therewith, and wherein the rudder support structure includes a torpedo-shaped section behind the first and second propeller units, the first propeller unit includes a first propeller hub, the second propeller unit includes a second propeller hub, and the first propeller hub, the second propeller hub and the torpedo-shaped section form a substantially streamlined body having a cross-sectional area that substantially continuously increases in the aft direction through said first propeller hub and through said second propeller hub.