why would it not be?
I would expect the 'traditional' buffet that precedes the 'classic' stall to begin at a specific AoA that changes only slightly with Mach (due to the subsonic effect of compressibility on the pressure distribution). IMHO it is highly probable that the buffet at AoA=6 degrees and M=0.6 is associated with locally supersonic flow.
Last edited by HazelNuts39; 29th July 2012 at 15:00.