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Originally Posted by Chperplt When someone says an aircraft is in a deep stall, they are saying that the aircraft speed has decayed well below stall speed. |
Technically speaking it's not speed but angle of attack. At too high an angle of attack the air passing over the top of the wing starts separating from the wing. Airstream that isn't attached to the wing doesn't generate lift. When you get to the point where lift no longer equals gravity, you go down.
The aircraft may or may not buffet. The nose may or may not "break." In fact the attitude of the aircraft might not change at all. You are just nose up and accellerating down. (A constant rate descent requires that lift = gravity).
Depending on aircraft design, distrupted air flow over the wing may also disrupt air flow over the flight controls as well.
I have flown airplanes with the needle momentarily pegged below the minimum indicated speed and still been sluggishly in control of them, however I was not stalled. Nor was I pulling a lot of G. The G force was closer to 0 than it was to 1.
On the other hand I have been on the verge of a stall at hundreds of knots. In this case the G's were closer to 7 than to one.