Aeronautical Terms beginning with V
V1
The maximum speed in the takeoff at which the pilot must take the first action (e.g., apply brakes, reduce thrust, deploy speed brakes) to stop the airplane within the accelerate-stop distance. Also the minimum speed in the takeoff, following a failure of the critical engine at Vef, at which the pilot can continue the takeoff and achieve the required height above the takeoff surface within the takeoff distance.
V2
Takeoff Safety Speed.
V2min
Minimum Takeoff Safety Speed.
Va
Design maneuvering speed.
Vb
Design speed for maximum gust intensity.
Vc
Design cruising speed.
Vd
Design diving speed.
Vdf / Mdf
Demonstrated flight diving speed.
Vef
The speed at which the critical engine is assumed to fail during takeoff.
Vf
Design flap speed.
Vfc / Mfc
Maximum Speed For Stability Characteristics.
Vfe
Maximum flap extended speed.
VFR
Visual Flight Rules.
VFR over-the-top
With respect to the operation of aircraft, the operation of an aircraft over-the-top under VFR when it is not being operated on an IFR flight plan.
Vfto
Final Takeoff Speed.
Vh
Maximum speed in level flight with maximum continuous power.
VHF
Very High Frequency.
Vle
Maximum landing gear extended speed.
Vlo
Maximum landing gear operating speed.
Vlof
Lift-off speed.
Vmc
Minimum control speed with the critical engine inoperative.
Vmo/ Mmo
Maximum operating limit speed.
Vmu
Minimum unstick speed.
Vne
Never-exceed speed.
Vno
Maximum structural cruising speed.
VOR
Very High Frequency Omnirange Station.
VORTAC
Collocated VOR and TACAN.
Vr
Rotation speed.
Vref
Reference Landing Speed.
Vs
The stalling speed or the minimum steady flight speed at which the airplane is controllable.
Vs1
The Stalling Speed or The minimum steady flight speed obtained in a specific configuration.
Vso
The Stalling Speed or The minimum steady flight speed in the landing configuration.
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.
Vtoss
Takeoff Safety Speed For Category A Rotorcraft.
Vx
Speed For Best Angle Of Climb.
Vy
Speed For Best Rate Of Climb.
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