V-speeds defined in 14 CFR part 1

• 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                   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
• VFTO                final takeoff speed
• VH                    maximum speed in level flight with maximum continuous power
• VLE                   maximum landing gear extended speed
• VLO                   maximum landing gear operating speed
• VLOF                 lift-off speed
• VMC                 minimum control airspeed with the critical engine inoperative
• VMO/MMO     maximum operating limit speed
• VMU                 minimum unstick speed
• VNE                  never-exceed speed
• VNO                  maximum structural cruising speed
• VR                     rotation speed
• VREF                reference landing speed
• VS                     stalling speed or minimum steady flight speed at which the airplane is controllable
• VS0                  stalling speed or minimum steady flight speed in the landing configuration
• VS1                   stalling speed or minimum steady flight speed obtained in a specific 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 aircraft
• VX                    speed for best angle of climb
• VY                     speed for best rate of climb
• V2                     takeoff safety speed
• V2min             minimum takeoff safety speed
• V1                      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. V1 also means 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.