The use of waterjets in vessels operating in the displacement and pre-planing regimes can lead to restrictions in transom geometry that impose significant drag penalties. The degree of freedom to which the designer has room to optimise the stern design of such vessels is restricted by the geometrical constraints of the propulsor fit. The design development of two specific examples are given; the first being a large high speed containership and the second a high speed patrol boat. The development of a novel, 'gullied' stern design and its application to both of these vessels is described in the paper together with drag predictions in support of its merit in reducing the drag of waterjet propelled craft operating in the pre-planing regime.
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