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h1000 pilot
description/installation
Page 7
rudder reference unit (rru)
description
The Rudder Reference Unit (rru) is a sealed, high specification potentiometer in a robust casing,
providing rudder position information to the pilot computer unit. The operating arm is constructed from
aluminium with three positions pre-drilled for the adjustable drag-link. The drag-link has ball-joints at
each end which connect the unit operating arm to the tiller arm or steering quadrant. The unit base has
four holes to allow for mounting. The unit is supplied with 10m (30ft) of 3-core screened cable.
key points when installing the rru
x
General consideration must be given to the steering system and its geometry before starting the
RRU installation. Many factors must be contemplated for a practical solution. The information
given here is for guidance only, although where a maximum or a minimum value is given these
must be adhered to.
x
Mount the rru on a flat surface next to the tiller arm or steering quadrant; construct a small
platform if necessary.
x
Do not lengthen the drag-link arm as this can transmit excessive vibration loads to the rru and
will invalidate the warranty.
x
The unit operating arm can be rotated through 360
q
; the mid-point of the potentiometer travel is
when the operating arm is opposite the cable entry point.
x
When the rudder is moved from hardover port to hardover starboard the rru arm should swing
through a minimum of 90
q
. This will ensure that there is sufficient voltage swing to the autopilot.