I don’t pretend to know anything about flutter, strength or stiffness other than you can get in trouble “improving” the strength of an airframe.  From what I have read over the years, unless a proven problem exists you might create one by making changes.  One example is a 6’ tapered fishing rod that will support say 25 lbs..  If you clamp it to a table with one foot hanging over the edge, it will break with a 10 lb. load.   Even I can understand that example.  All the factors that affect flutter are way beyond me.

Tail shake is occurring every time a Legacy applies full power for takeoff.  If you want to see for yourself, watch the tail of a Legacy (or probably most highly powered prop planes) when the brakes are set and full power is applied.  The tail is moving around A LOT.  Apparently it’s not a problem since the high time airframes seem to be doing just fine.  After thousands of hours maybe our composite airframes will have structural problems (like the Cessna 210

 I understand).

Steve Colwell  Legacy