Explanation Of Parameters And Operation Modes; Yawing; Rudder - Raytheon NautoPilot NP 5100 Operator's Manual

1.3

Explanation of parameters and operation modes

1.3.1

Yawing

Must be set according to sea state.
The yawing setting determines rudder activity and heading accuracy for the Autopilot's
control properties.
The possible range of parameter yawing is 1 to 6 (in increments of 1).
Default value is 2.
The optimum setting is obtained by means of observation.
If the setting is not optimised, the steering gear can become over--stressed. Large
rudder angles can lead to speed loss in a seaway.
Decrease of yawing gives a better control performance but with the drawback of more
rudder activity.
Increase of yawing gives a less rudder activity but with the drawback of less control per-
formance.
1.3.2

Rudder

Heading deviation needs to be corrected by means of a rudder movement effectivity
typical to the ship. The rudder setting determines the ratio of rudder angle to heading
deviation.
The possible range of parameter rudder is 1 to 9 (in increments of 1).
Default value is 5.
Decrease rudder if the intensity of the rudder movement is too strong. Increase the rud-
der intensity if the rudder movement is too weak during heading keeping.
4002.DOC010102
OPERATION
NautoPilot 5000 Series
Yawing = 1 signifies control with the greatest amount of activity
(maximum accuracy level)  calm sea.
Yawing = 6 signifies control with the lowest amount of activity (minimum
accuracy level)  high sea state.
Rudder too large (parameter = 9):
Unstable behaviour  over--reacts to a heading change.
Rudder too small (parameter = 1):
Heading Control too inaccurate
 overshoots when heading is changed.
 pre--configured rate of turn not reached during
heading change manoeuvre
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Edition: September 2014