Instruction manual

Simrad AP26 and AP27 Autopilots
128 20221586F
• 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.
Note ! See also “Minimum Rudder” on page 116.
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 proportional rudder response as provided
by the heading error. 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 illustrate the effects off
various Counter Rudder settings.
Autotrim
standard value is 40 sec. which should work well on
most boats.
Rudder Limit
should be kept at 20 degrees unless there is a
need for more rudder when performing dockside manoeuvres.
N
ew course
Counter rudder setting too
low, overshoot response
Correct setting of counter
rudder, ideal response
N
ew course
Counter rudder setting too high,
sluggish and creeping response
N
ew course