ORIGINAL: Bax
A "true" deep stall is usually found when certain types of aircraft with high stabilizers get the tail blanked by the turbulence coming off the wing in a stall...
You can force an F-16 in this kind of situation by inducing a snap roll while slightly inverted and nearly stalled when going straight up. The plane will flop over on its back, and begin "shaking like a leaf and falling like a rock". There will be some gentle back-and-forth rocking along the pitch and roll axes (more pitch than roll), but attempting to pull out of it won't work.
You have to disable the AOA circuitry and then begin "rocking" the stick back and forth, in time with the rocking motion of the aircraft. Normally, you can recover in 7-10,000 feet of altitude. If you do this below 5,000 feet, good luck, because your plane will come right down on your head if you punch out...
(Way too much time spent on a flight simulator and yakking with my brother, who was a fighter WSO before going cargo, retiring, and going commercial...)
I also routinely deep-stall (isn't it also called a "Harrier"?) my Delta model to land it in limited space. I can get the descent down to about 2-3 feet per second, and gun the throttle or pitch down to get out of it. Very occasionally, I can manage to maintain altitude with an extreme nose-up attitude and 3/4 throttle, and just coast along at less than walking speed. I haven't quite gotten the knack of doing that consistently yet, though.
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Matt B.