the Aviation Dictionary

VSSE . VYSE
VA -- Design maneuvering speed. The speed below greatest altitude gain over a specified distance with one
which abrupt and extreme control movements are engine inoperative.
possible (though not advised) without exceeding the
airframe's limiting load factors.
VYsE - In multi-engine aircraft, best rate of climb, single
engine airspeed. VYsE is the speed that produces the
VFE - Maximum flap extension speed (top of white arc
greatest gain in altitude in a given amount of time with
on ASI).
one engine inoperative.
VFTO - Final takeoff speed.
VMca - Minimum control speed (air). The minimum
speed at which control of a twin-engine aircraft can be
maintained after failure of one engine.
VMCG - Minimum control speed (ground). The minimum
speed at which control of a multi-engine aircraft can be
maintained after failure of a wing mounted engine on
the ground.
VNE - Never-exceed speed, 'redline speed' denoted by a
red radial on an ASI.
VMo - Maximum operating speed. Also MMO, Mach
limit maximum operating speed.
VNO - Nonnal operating speed. The maximum structural
cruising speed allowable for normal operating
conditions (top of green arc on ASI).
VR - Rotation speed, at which to raise the nose for takeoff.
VREF - Reference landing speed.
Vso - Stalling speed at max takeoff weight, in landing
configuration with flaps and landing gear down, at sea
level, ISA conditions (bottom of white arc on ASI).
Vx -Best angle of climb speed on all engines.
VXsE - Best engine-out angle of climb speed.
Vy -Best rate of climb speed on all engines.
VYs~ - Best engine-out rate of climb speed, 'blue line
speed' (blue radial on airspeed indicators of light twins)
VssE - In multi engine aircraft, intentional one engine
inoperative airspeed. VssE is not an airspeed defined by
the FAA, but rather an airspeed developed by the
manufacturer. It is considered the minimum speed for
intentionally rendering one engine inoperative in flight
for pilot training.
V-tail - A glider with two tail surfaces mounted to form
a V. V-Tails combine elevator and rudder movements.
V-tail surface - An empennage consisting of two fixed
and two movable surfaces arranged in a V shape. These
two surfaces have the same aerodynamic hnction as
the more conventional three surfaces.
VTOL aircraft - An aircraft that can takeoff and land
without forward motion. Capable of vertical climbs
andlor descents and of using very short runways or
small areas for takeoff and landings. These aircraft
include, but are not limited to, helicopters.
vulcanize - A process of treating crude rubber with
sulfur and subjecting it to heat. Vulcanizing increases
the strength and elasticity of the rubber.
VXsE - In multi-engine aircraft, best angle of climb,
single engine airspeed. VXsE is used for obstruction
clearance with engine inoperative. It provides the
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