Stall speed
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Stall speed is an aerodynamic term.
For every weight of every aircraft, there is an airspeed at which the wing's angle of attack will exceed the critical angle of attack. At this angle of attack the air will no longer flow smoothly over the upper surface of the wing. The wing will cease developing sufficient lift and the wing will stall.
There are multiple V speeds which are used to indicate when a stall will occur:
- VS: the stalling speed or the minimum steady flight speed at which the airplane is controllable. Usually synonymous with VS1.
- VS0: the stalling speed or the minimum steady flight speed in the landing configuration.
- VS1: the stalling speed or the minimum steady flight speed obtained in a specific configuration (usually a "clean" configuration of flaps, landing gear and other sources of drag).
- VSR: reference stall speed.
- VSR0: reference stall speed in the landing configuration.
- VSR1: reference stall speed in a specific configuration.
- VSW: speed at which onset of natural or artificial stall warning occurs.
Stall speeds indicated on Airspeed Indicator
On an airspeed indicator, VS0 is indicated by the bottom of the white arc, while VS is indicated by the bottom of the green arc.
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