Patent ID: 7806068

Claim:
A rudder ( 1 ) for changing the direction of motion of a marine vehicle, which rudder is adaptable to a rudder shaft ( 4 ) having an axis; said rudder ( 1 ) having opposing lateral surfaces each defining a surface area of said rudder, said rudder being rotatable by a drive unit ( 2 ) around an axis substantially vertical to the lateral surfaces of the rudder ( 1 ), wherein the rudder ( 1 ) is actuated to rotate in a manner that the surface area of the rudder ( 1 ) behind the axis of shaft ( 4 ) is greater than the surface area of the rudder ( 1 ) in front of the axis of shaft ( 4 ) when said marine vehicle moves forward and is actuable to rotate such that the surface area of the rudder behind the axis of shaft ( 4 ) is smaller than the surface area of the rudder in front of the shaft when said marine vehicle moves in reverse.