> for that aircraft?<flameproof jacket on> So maybe the problem could be with the FDM representing the wrong adverse yaw amount
</flameproof jacket on>
As someone else mentioned, it's simply a matter of implementing a yaw-damper in the autopilot -- think of it as a device that keeps adjusting the rudder automatically to keep the ball centred, just like the heading-hold keeps adjusting the ailerons to keep the heading bug at the top of the HI or HSI. It's not all that realistic for a small plane, but I guess that's what people want when they ask for autocoordination. As Matthew mentions, most modern trainers barely need the rudder at all for turns -- we use it mainly for countering yaw in a steep climb and for deliberately-uncoordinated maneuvers like crosswind landings foreward slips.
Some small planes do have a lot of adverse yaw. Rightly or wrongly, our current J3 Cub model wants a lot of rudder when the ailerons are deflected, and I know that a lot over older (pre WWII) planes in real life do because of the lack of differential aileron deflection.
All the best,
David
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