Instruction manual

Robertson AP11 Autopilot
82 20220513E
Rudder sets the rudder gain which is the ratio between the
commanded angle and the heading error (P-factor) .
• Too little Rudder and the autopilot fails to keep a steady
course.
• Too much Rudder gives unstable steering and reduces
speed.
• Low speed requires more rudder than high speed.
Counter Rudder is the parameter that counteracts the effect
of the boats turn rate and inertia. For a short time period it is
superimposed on the normal rudder response as provided
by the Rudder parameter. It may sometimes appear as if it
tends to make the rudder move to the wrong side (counter
rudder).
The best way of checking the value of the Counter Rudder
setting is when making turns. The figures illustrates the
effects off various Counter Rudder settings .
Too little rudder
Too much rudder
Course to steer
Course to steer
New course
Counter rudder setting too
low, overshoot response