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V-speed designator |
Description |
|
V1 |
Maximum speed during takeoff at which a pilot
can safely stop the aircraft without leaving the runway. This is
also the minimum speed that allows the pilot to safely continue (to
V2 takeoff) even if a critical engine failure occurs (between V1 and
V2).
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|
V2 |
Takeoff safety speed.
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V2min |
Minimum takeoff safety speed.
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VA |
Design maneuvering speed, also known as the
"Speed for maximum control deflection." This is the speed at which
it is unwise to make an abrupt application of any single flight
control as it may generate a force greater than the aircraft's
structural limitations.
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|
VB |
Design speed for maximum gust intensity.
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|
VC |
Design cruising speed, also known as the
optimum cruise speed, is the most efficient speed in terms of
distance, speed and fuel usage.
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VD |
Design diving speed.
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VDF |
Demonstrated flight diving speed.
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VEF |
The speed at which the critical engine is
assumed to fail during takeoff.
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|
VF |
Designed flap speed.
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VFC |
Maximum speed for stability characteristics. |
|
VFTO |
Final takeoff speed. |
|
VH |
Maximum speed in level flight at maximum
continuous power. |
|
VLE |
Maximum landing gear extended speed. This is
the maximum speed at which it is safe to fly a retractable gear
aircraft with the landing gear extended. |
|
VLO |
Maximum landing gear operating speed. This is
the maximum speed at which it is safe to extend or retract the
landing gear on a retractable gear aircraft. |
|
VLOF |
Lift-off speed. |
|
VMC |
Minimum control speed with Critical engine
inoperative. |
|
VMO |
Maximum operating limit speed. |
|
VMU |
Minimum unstick speed. |
|
VNE |
Never exceed speed. |
|
VNO |
Maximum structural cruising speed. |
|
VR |
Rotation
speed. The speed at which the airplane's nosewheel leaves the
ground. |
|
VRef |
Landing reference speed. |
|
VS |
Stall speed or minimum steady flight speed for
which the aircraft is still controllable in the landing
configuration. |
|
VS0 |
Stall speed or minimum flight speed in landing
configuration. |
|
VS1 |
Stall speed or minimum steady flight speed for
which the aircraft is still controllable in a specific
configuration. |
|
VSR |
Reference stall speed. |
|
VSR0 |
Reference stall speed in landing configuration.
|
|
VSR1 |
Reference stall speed in a specific
configuration. |
|
VSW |
Speed at which the stall warning will occur.
|
|
VTOSS |
Category A rotorcraft takeoff speed. |
|
VX |
Speed that will allow for best angle of climb.
|
|
VY |
Speed that will allow for the best rate of
climb. |
|
V-speed designator |
Description |
|
Vmbe |
Maximum brake energy speed |
|
Vmd |
Minimum drag |
|
Vmca |
Minimum control speed, air – the minimum flight
speed at which the aircraft is directionally controllable. Aircraft
certification conditions include the most critical engine becoming
inoperative and windmilling (propeller unfeathered), not more than a
5 degree bank towards the operative engine, takeoff power on the
operative engine, landing gear up, flaps in takeoff position, and
most unfavorable center of gravity. Defined by FAR Part 25.149, in
the United States. |
|
Vmcg |
Minimum control speed, ground, with nose wheel
steering assumed inoperative |
|
Vmcl |
Minimum control speed, approach and landing |
|
Vme |
Max endurance |
|
Vmini |
Minimum IFR speed for helicopters |
|
Vmp |
Minimum power |
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Vmr |
Max range |
|
Vnd |
Max structural cruising speed |
|
Vp |
Aquaplaning speed |
|
Vra |
Rough air speed |
|
Vs1g |
One g tall speed |
|
Vsse |
Safe single engine speed |
|
Vt |
Threshold speed |
|
Vtmax |
Max threshold speed |
