Bob F. wrote:
WrongO againO. The "coffin corner" is an altitude (point on a chart
where the stall speed and Mach come together) with a max power setting.
If you go faster, you get mach buffet. If you go to slow, you stall.
If you reduce power setting, you stall. If you nose over to recover,
you mach buffet. With your example I can see why you're confused.

I'm not confused and neither are you. :-))

The coffin corner YOU are describing can be found in the flight envelope
of the U2 (as well as other airplanes) at high altitude cruise. The
coffin corner I'm describing can be found on a dragged in approach AT
LOW ALTITUDE with the aircraft behind where the flight test community
defines the area of reverse command; that being below the airspeed for
maximum endurance. The corner is reached as you get the airplane low
enough on the approach where the sink rate can't be stopped with power
as maximum is already applied. The ONLY way out of the corner is to
reduce angle of attack. If the proximity between the aircraft and the
ground won't allow that angle of attack reduction, you hve what we call
the "coffin corner".

--
Dudley Henriques