Patent Number: 6,332,818

Title: Propulsion system

Abstract: A propulsion system for a water craft having at least one shaft extendingrearwardly form the transom of the hull of the craft and a drive systemfor driving the at least one shaft. A surface piercing propeller ismounted on the at least one shaft, proximal to the trailing edge of thehull, so that the propeller operates in a transom cavity created behindthe hull, in use of the craft. The ratio (S/C) of the spacing of theblades to the blade cord for each propeller is at least 2.0 alongsubstantially the whole length of the blades. The propulsion system has ahigh operational efficiency particularly suited for high speed marinecraft.

Inventors: Duncan; Ian James (Livingston, GB), Duncan; Hugo Anthony (Livingston, GB)


International Classification: B63H 1/14 (20060101); B63H 5/16 (20060101); B63H 3/00 (20060101); B63H 1/28 (20060101); B63H 5/00 (20060101); B63H 3/04 (20060101); B63H 1/00 (20060101); B63H 001/18 (); B63H 001/00 (); B63H 003/00 ()

Expiration Date: 12/25/2014