Stall Scenarios
Accelerated Stall (High G)
Stalling at a speed higher than normal $V_{s1g}$ due to increased Load Factor.
- Turns: In a 60° bank level turn, Load Factor is 2.0g. Stall speed increases by $\sqrt{2} = 1.41$ (41% higher).
- Recovery from Dive: Pulling up abruptly increases G-load, potentially causing a secondary stall.
Deep Stall (Super Stall)
A condition in T-tail aircraft where the turbulent wake from the stalled main wing blankets the tailplane/elevator.
- Effect: The elevator becomes ineffective. The pilot cannot pitch down to recover.
- Solution: Stick Pusher (activates before deep stall is reached) or designing the tail out of the wake.
Environmental Factors
- Icing: Increases weight (higher stall speed) and disrupts airflow (lower $C_{L_{max}}$). Can lead to stall at speeds well above normal warning thresholds.
- Windshear: A sudden loss of headwind causes an immediate loss of IAS, potentially dropping below $V_{stall}$.
- Heavy Rain: Acts like icing (roughens surface) and adds weight/momentum to the air (downward force).