Counter Rudder; Ship Load (For Adaptive Mode Only) - Raytheon NautoPilot NP 5100 Operator's Manual

1.3.3

Counter rudder

Based on its bulk and load, each ship has a time constant typical to the ship, which
needs to be controlled during heading change manoeuvres.
Before the new set heading is reached, the turning speed of the ship must be reduced
by a counter rudder action (movement).
This effect is achieved by the counter rudder setting.
The possible range for parameter counter rudder is 0 to 9 (in increments of 1)
Default value is 5.
Decrease counter rudder if the rudder movement in counter direction at the end of head-
ing change is too strong or comes too early resulting in too slow setting to the new set
heading value.
Increase counter rudder if the rudder movement in counter direction at the end of a
heading change is too week or comes to late resulting in too much overshoot settling to
the new set heading value.
1.3.4

Ship Load (for Adaptive mode only)

Each ship has a typical behaviour depending on the load of a ship.
This parameter takes into account the ship's load for the steering control by an Autopilot.
This parameter is input according to the load percentage.
10% is for the lowest load condition.
100% is for a maximum ships load.
Edition: September 2014
OPERATION
NautoPilot 5000 Series
Counter rudder too high (parameter = 9):
The ship reaches the new set heading too slowly.
Counter rudder too small (parameter = 0):
The ship overshoots the selected heading.
9
AUTOPILOT
4002.DOC010102