"John R Weiss" wrote in message
...
"Tarver Engineering" wrote...

So one doesn't use rudder when doing a manual turn as one does on
every
other aircraft made?

The YAW damper moves the rudder for the airplane, no human workload is
involved.

The yaw damper does move the rudder, but its function is not to keep the
ball
centered. Its function is to reduce yaw oscillations around the [normally
0]
slip angle induced by the current airplane trim.

The YAW damper also co-ordinates turns and cancels fugoids. It is not an
optional thing, except where much vomiting is considered desirable.

Only if there is an active
3-axis autopilot will the rudder be trimmed automatically.

You are as usual, attepting to change the subject, Weiss.

There is NO
automatic rudder trim in the 747-400 except during autoland operations
below
1500' AGL.

The automatic YAW damper is always there on the 747-400.

Please expalin what automatic rudder trim has to do with this discussion.