Raymarine ST1000 Plus & ST2000 Plus Tiller Pilots ST1000 Plus & ST2000 Plus User Manual
Chapter 5: Commissioning the Tiller Pilot
59
5
The following test will determine whether the rudder gain is set too
high or too low.
high or too low.
1. In clear water and with the autopilot in Auto mode, alter course to
starboard by 40° by pressing +10 four times.
•
•
At cruising speeds, a course change of 40° should result in a
crisp turn followed by an overshoot of no more than 5°.
If this occurs the rudder gain is set correctly.
crisp turn followed by an overshoot of no more than 5°.
If this occurs the rudder gain is set correctly.
•
If rudder gain is too high, the 40° course change will result in a
distinct overshoot of more than 5° (A).
Correct this oversteer by reducing the rudder gain setting.
distinct overshoot of more than 5° (A).
Correct this oversteer by reducing the rudder gain setting.
•
If rudder gain is too low, the boat’s steering performance will
be sluggish – it will take a long time to make the 40° turn and
there will be no overshoot (B).
Correct this understeer by increasing the rudder gain setting.
be sluggish – it will take a long time to make the 40° turn and
there will be no overshoot (B).
Correct this understeer by increasing the rudder gain setting.
Note: It is easier to recognize these actions in calm sea conditions
where wave action does not mask basic steering performance.
where wave action does not mask basic steering performance.
2. Refer to the calibration menu diagram in Chapter 6: Adjusting
Tiller Pilot Settings, for instructions on how to adjust the rudder
gain setting.
gain setting.
3. Repeat the test until you achieve crisp course changes with no
more than 5° of overshoot.
You should set the rudder gain to the lowest setting consistent with
accurate course keeping. This will minimize drive movements and
reduce power consumption and wear and tear.
accurate course keeping. This will minimize drive movements and
reduce power consumption and wear and tear.
New
heading
New
heading
A
New
heading
B
Correct
rudder gain
Rudder gain
too high
too high
Rudder gain
too low
too low
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81130_3.book Page 59 Wednesday, July 25, 2001 11:57 AM