1.1.1 For
the purposes of these Rules, a water jet propulsion unit is described
as a machine which takes in water, by means of a suitable inlet and
conduit and accelerates the mass of water using an impeller and nozzle
to form a jet propulsion system. The water jet system comprises the
unit and its associated actuation and control devices. The detail
of the prime mover is excluded but not its effect on the water jet
system.
1.1.3 The
requirements for a fixed or steerable water jet propulsion system
rated at 500 kW and above, which is integral with the ship’s
hull structure and forms a means of main propulsion, are detailed
in this Chapter. This includes support arrangements, controls and
the systems necessary to maintain operation and functionality of the
water jet unit.
1.1.4 These
requirements relate to water jets driven by axial or mixed flow pumps.
Where units driven by radial flow pumps or inducers are proposed,
details are to be submitted for consideration.