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Autotrim
Under differing conditions a tiller bias (sometimes known as
standing helm or rudder trim) is applied in order to steer a straight
course. An example is when sailing close-hauled, where the vessel
will normally pull into the wind, and the helmsman applies a
standing helm to leeward, in order to maintain course. The amount
of this standing helm varies according to factors such as strength of
wind, boat speed, sail trim, and amount of sail set. If no account of
these were taken, then the vessel would tend to veer off course, or
pull around head-to-wind when sailing close-hauled.
The Tillerpilot continuously
monitors the average course
error and applies a bias to the
tiller to compensate, until the
optimum condition is reached.
This bias, or standing helm, is
applied gradually, so as not to
upset the normal performance
of the Tillerpilot. Thus, it may
take up to a minute or so
to fully compensate after
changing tack. Once optimum
trim is reached, the pilot will
still monitor for changes in
the prevailing conditions and
update the trim accordingly.
Wind
and
Tide
Course
without
Autotrim
Ideal
course
¼ Note: Autotrim is applied automatically and cannot be manually
adjusted.