V Flashcards
Va
The design maneuvering speed. The maximum speed
at which full, abrupt control movement can be used without
overstressing the airframe.
Vapor lock
A problem that mostly affects gasoline-fuelled
internal combustion engines. It occurs when the liquid fuel
changes state from liquid to gas while still in the fuel delivery
system. This disrupts the operation of the fuel pump, causing
loss of feed pressure to the carburetor or fuel injection system,
resulting in transient loss of power or complete stalling.
Restarting the engine from this state may be difficult. The fuel
can vaporise due to being heated by the engine, by the local
climate or due to a lower boiling point at high altitude.
Variation
Compass error caused by the difference in
the physical locations of the magnetic north pole and the
geographic north pole.
Vector
A force vector is a graphic representation of a force
and shows both the magnitude and direction of the force.
Vectoring
Navigational guidance by assigning headings.
Velocity
The speed or rate of movement in a certain direction.
Venturi tube
A specially shaped tube attached to the outside of an aircraft to produce suction to allow proper operation of gyro instruments.
Vertical axis
An imaginary line passing vertically through the center of gravity of an aircraft. The vertical axis is called the z-axis or the yaw axis.
Vertical card compass
A magnetic compass that consists of an azimuth on a vertical card, resembling a heading indicator with a fixed miniature airplane to accurately present the heading of the aircraft. The design uses eddy current damping to minimize lead and lag during turns.
Vertical speed indicator (VSI)
A rate-of-pressure change instrument that gives an indication of any deviation from a constant pressure level.
Vertical stability
Stability about an aircraft’s vertical axis. Also called yawing or directional stability.
Very-high frequency (VHF)
A band of radio frequencies falling between 30 and 300 MHz.
Very-high frequency omnidirectional range (VOR)
Electronic navigation equipment in which the flight deck instrument identifies the radial or line from the VOR station measured in degrees clockwise from magnetic north, along which the aircraft is located.
Vestibule
The central cavity of the bony labyrinth of the car or the parts of the membranous labyrinth that it contains.
Vfe
The maximum speed with the flaps extended. The upper limit of the white arc.