The article discusses an attempt to develop a new type of rudder design by selecting a changed total plan and avoiding the expensive miter gear which would provide for an increased propelling performance at equivalent conditions of flow technique. The present arrangement has a drive system propelled through a hollow rudder shaft by an electric motor in the ship. The propelling chamber consists of a cylindrical nosepiece, coaxial to the rudder shaft. A propeller with an opposite blade pitch is driven, by the vertical drive shaft, into the upper and lower inflow opening of the propeller chamber in the same direction of rotation.
Edited trans. of Schiffbautechnik (East Germany) v16 n12 p673-677 1966, by E. Novak.