Stall Recovery Parachute
I understand if that a stall is not dealt with properly immediately - or incorrectly - it may develop into a unrecoverable stall.
At what stall-angle (angle of atack) will the elevator be virtually useless to lower the nose? 30 og 40degrees?
Will it be possible to recover from 40 AoA stall using alternative methods? (asuming the elevator is not able to get the nose down) Indtroduce rotation /spin /wing-drop using rudder or ailron or single-side engine power.
Also - At high altitude - why would anyone use engine force to recover from a complete stall - concerning the potential disastrous delay it introduces to lowering the nose and AoA.
And would it be a idea to introduce an obligatory "stall recovery parachute" - it would perhaps be the only option to safely get a severely stalled aircraft into back in business.
Are even large passenger planes tested for a severe stall in real life?