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 Control
of Humphree’s loss-free steering systems comprises four main elements:
• Interceptor control unit
• Position indication instrument
• Selector switch panel
• Helm command
The
interceptor control unit is connected to the waterjet control system and
executes the helm command by controlling the servo actuators of the interceptors.
The interceptor blade position is monitored with a high-quality, illuminated,
analogue instrument. The selector switch panel provides the operator with
a choice of using the interceptor system or the normal waterjet steering
system. Helm command is by way of any of the normal modes of operation
of the waterjet control system. Once the interceptor system is selected
and becomes active the operator will command the helm in the same manner
as he would using the waterjet system.
Expanded
functionality of the waterjet control system provides safe and smooth
transition to and from interceptor steering. Below a programmed thrust
lever command position, only the waterjets will steer to ensure safe low
speed manoeuvring. When going above the programmed lever position the
system automatically switches over to interceptor steering (providing
this is requested by the operator), whilst simultaneously centralising
the waterjet buckets. If the interceptors are requested to be deployed
beyond their maximum extension by a steering command, the waterjet buckets
will automatically engage and deflect the jets to give additional steering
force (see diagram).
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