Pleuger rudder

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The Pleuger rudder (also known as a Dutch rudder) is a power assisted ship's rudder. It creates a flow of water in the direction the rudder points powered by an auxiliary electric motor. This aids maneuverability at low speeds greatly, since it operates on a similar principle to a thruster.

A ducted propeller is mounted as an integral part of the rudder and is fixed to it. The duct is a Kort nozzle and enables the propeller to develop more thrust than an unducted propeller.

The Pleuger rudder is necessarily mounted in the flow from the main engine's propeller in a ship with an odd number of propellers. If the Pleuger and the main engine are run at the same time, the Pleuger can often be torn away.[1] The thrust produced by the Pleuger rudder is sufficient to power the ship in slow speed maneuvers when the force required to move the vessel is relatively small. The pleuger rudder is meant to be assisting in the fast maneuverability of ships, in tight harbor operations. Thus, it is only an improvement of rudder by controlling the water flow pattern passing a rudder and thus giving it an artificial flow and thus an extra power to steer even in slow engine r.p.m.  It is absolutely not a substitute of propeller, without which, the mammoth energy required to make a ship move over water  is hard to generate.

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  1. ^ "m.s Elizabeth Bowater". The Bowater Steamship Company. Retrieved 17 October 2010. "...the maiden voyage of the Elizabeth Bowater, which got off to a bad start (serves them right for sailing from Dundee on Friday 13th, June 1958) as the propeller for the Pleuger"Activ" rudder fell off while leaving the Caledon Shipyard in Dundee." 

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