Mach buffet

[Ref Pilot’s Handbook of Aeronautical Knowledge, FAA-H-8083-25B Page 5-48, 5-49]

What’s Mach buffet?

Mach buffet (vibrate) is “high-speed” buffet. It occurs when too fast in an airspeed or too high in an AOA near the Mmo. Usually, airflow separation due to shock wave as well as wave drag produces a turbulent wake behind the wing, which causes the tail surface to buffet (vibrate).

In an other case – “low-speed Mach buffet”, is possible to happen when an aircraft flying at a speed too slow for its weight and the AOA increases to have the same effect of wave drag induced buffet.

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Mach tuck v.s Tuck under

 

 

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