Originally Posted by PJ2
I would be interested in hearing if you believe it is possible to differentiate between high speed buffet and low speed buffet at cruise altitude.
PJ2 and Bergerie1;
I believe that the aerodynamic 'mechanism' that I described in post #3447 is the same for high speed buffet and low speed buffet. The curves in the buffet boundary graph produced by mm43 a little while ago are continuous across the maximum at about M=0.82. That is even more apparent if you reduce these curves to a
lift-coëfficient. Therefore I wouldn't expect a discontinuity in 'feel' across that maximum.
EDIT: That said, it may well be that when looking at a range of Mach, say from .75 to .86, that the frequency content of buffet felt at the pilot's station changes with Mach.
Regards,
HN39
PS: The graph linked above combines in a continuous curve FCOM 3.01.20 Page 4: Buffet Boundary for 0.5<M<0.86 and
Page 7: Stalling Speeds for 0.2<M<0.425 .