Bill Daniels wrote:
"nafod40" wrote in message

Interesting observation. Flying in ground effect places the center of
pressure of the wing at about mid-chord, while out of ground effect the
center of pressure is about 1/4 chord. So in short, ground effect
usually has a stabilizing effect by essentially shifting the CG forward
with respect to the center of lift.


Al I can say is put a G103 in ground effect and see for yourself.
Obviously, flying qualities in ground effect deals with the whole glider and
not just the wing. No doubt the flow over the tail is involved as well.

I have, and i don't remember any decrease in longitudinal stab. Having
the ground that close certainly tends to "up the gain" in the soft mushy
grey matter autpilot though.