Variometer
See VSI (Vertical Speed
Indicator).
Vent
Verb: "to vent" is the action of opening
the vent to cool the air in the envelope. Noun: an
envelope opening that will automatically close.
Vent Line
The line that activates the cooling
vent. |
VFR (Visual Flight Rules)
Flight rules
governing aircraft flight when the pilot has visual
reference to the ground at all times.
VHF (Very High Frequency)
The frequency
range used for air/ground voice and navigational
facility communications.
Virga
Precipitation that falls from a cloud and
evaporates before reaching the ground. |
Volume
The total amount of air or gas
(expressed in cubic feet) contained in a balloon
envelope.
VSI (Vertical Speed Indicator)
An instrument
that continuously records the rate at which an
aircraft climbs or descends. Usually measured in
FPM. A required instrument in a balloon.
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