The odd-ball thing is that, having entered the deep stall (usually by 'wind-up), if the wing dropped to vertical, or you went inverted, you were 'out of the poo', because you now had normal airflow over the tail surfaces. If you mismanaged the ensuing rapid descent with increasing speed, you were back in the poo of a different type.
Normal 'full back stick' stall testing is done with idle thrust, and stabiliser trim trimmed for Vs+10, and a controlled deceleration at 1Kt/sec until stall occurs. 747FOCAL's and my definition of a 'wind up' stall may differ, but for deliberate efforts to enter the deep stall, large UP stabiliser trim was used with large thrust settings to gain high pitch attitudes just pre-stall, and then chopping the thrust and rapidly applying full UP elevator. Disneyland offers no more exciting ride.
corporal klinger, tried many fully developed spins in the simulator "just in case". Never recovered successfully from one of them.
Regards,
Old Smokey