On Sep 15, 8:09*am, Kenneth Kilbourne
wrote:
What causes the buckling/oil canning on the bottom of the ailerons and the
elevator on Grobs? I have looked at 6 ships and they all have the same
problem.
What's the fix?
KK

not sure about the fix, but am guessing the cause is no foam core on
the lower skin, and several ribs that are now giving the "starved
horse" look.

I've seen the same thing on the Grob Astir's on our field.

Brad