In recent years there has been a revival of interest in hydraulic jet propulsion as a means of propulsion for seacraft. In this paper the important design variables for this type of system are established and the theoretical relationships between them derived. The sphere of application of this method of propulsion is considered and the effect of the different variables discussed. This discussion is illustrated by reference to a typical design and the results of field tests are examined to check the validity of data on which the design is based. In conclusion some general comments are offered on the types of water jet units which show promise for commercial development.
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