> With the turbulence zero, both behave the same.
> 
> The SenecaII wing rock with light turbulence appears to result from a
> very exaggerated adverse aileron yaw.  So I did the same experiment with
> the c172p and pa28-140 which both use the kap140.  With the default
> turbulence, the c172p oscillates so bad that you cannot complete the
> approach with the LOC needle going full stop to full stop near the
> runway.  The pa28-161 (also yasim) is as solid as a rock all the way
> down the glide slope with light to moderate turbulence.
> 
> If you watch the oscillation for either jsbsim model, you should note
> that when the yoke is rotating counter clockwise, the nose is yawing
> right and then finally swings back left, as would be expected with
> extreme adverse aileron yaw.

I looked at the configuration file for the Seneca II in flightgear cvs. It
appears to me (at least given the quick glance I took) that adverse aileron
yaw (Cnda) is turned off - the data is all zeros.

Still looking.

Jon



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