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Conventional rudders are placed behind the propeller with the rudder cross section arranged symmetrically about the vertical rudder centre plane. However, this arrangement does not consider the fact that the propeller induces a strong rotational flow that impinges on the rudder blade. This results in areas of low pressure on the blade that induce cavitation and associated erosion problems. To avoid cavitation and to improve the manoeuvrability performance of a full spade rudder, Becker has enhanced the development of twisted leading edge rudder types.