So if VNE is an indicated airspeed (which it clearly is), then is it safe to assume that one would have flutter margins if a IV was in a descent from  FL 290 and was indicating 276 knots as it passed through FL250.  I think everyone agrees that flutter is a function of TAS.  So what we really need to know is what TAS that flutter should be expected on the various Lancair airframes.  If you cannot get into a flutter situation all on the models if you stay below VNE at the service ceiling, then its a moot point and all we need to know is VNE.   But if trouble can begin at speeds below VNE at high altitudes, then we really need to know the flutter TAS for the models.

 

Dennis Ramsey

Lancair IV 

65 hours