4.1_ V Speeds

In aviation predefined speeds are called "V speeds" here are the abbreviations of the V speeds you will use most.

Va ....... Design maneuvering speed or maximum airspeed for turbulence
Vb ....... Maximum gust intensity speed
Vc ....... Design cruising speed
Vd ....... Diving Speed
Vh ....... Maximum level flight speed at full power
Vg ....... Best glide speed
Vfe ...... Maximum speed at which flaps may be extended
Vle ...... Maximum speed at which the aircraft may be operated with landing gear down
Vlo ...... Maximum speed at which lading gear can be extended
Vne ..... Never exceed speed
Vno ..... Maximum structural cruising speed, to be exceeded only in smooth air
Vmc .... Minimum controllable speed with an engine out, any slower and the control surfaces will not be able to counter asymmetric thrust
Vs0 ..... Stall speed in landing configuration gear down flaps down
Vs ....... Stall speed in clean configuration (Flaps and Gear Up) sometimes referred to as VS1
Vref .... Landing reference speed (1.3 x VSO)
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Vx ....... >The airspeed that provides the best angle of climb (Highest altitude in shortest distance). It’s typically a fairly slow speed and it most useful for taking off over obstacles like trees
Vy ....... The airspeed that provides the best rate of climb (higest altitude in least amount of time) It is faster than VY and is most useful for getting to an altitude as quickly as possible
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V1 ....... Critical engine failure recognition speed, the maximum speed at which take-off can be aborted
VR ....... Rotation speed
V2 ....... Take-Off Speed, the speed at which the aircraft creates enough lift to fly.
V2min .. Minimum take-off speed

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