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the static ports and an external
capacity. Variometers can be
mechanical or electrical and can
be compensated to eliminate unrealistic
indications of lift and sink
G-7
due to rapid speed changes.
VERTICAL AXIS—An imaginary
straight line drawn through the
center of gravity and perpendicular
to the lateral and longitudinal
axes. Yaw movement occurs
around the vertical axis and is
controlled by the rudder.
VISUAL
METEOROLOGICAL
CONDITIONS (VMC)—Meteorological
conditions expressed in
terms of visibility, distance from
cloud, and ceiling equal to or better
than a specified minimum.
VMC represents minimum conditions
for safe flight using visual
reference for navigation and traffic
separation. Ceilings and visibility
below VMC constitutes
Instrument Meteorolog-ical
Conditions (IMC).
WASHOUT—Slight twist built in
towards the wingtips, designed to
improve the stall characteristics of
the wing.
WATER VAPOR—Water present
in the air while in its vapor form. It
is one of the most important of
atmospheric constituents.
WAVE LENGTH—The distance
between two wave crests or wave
troughs.
WAVE WINDOW—Special areas
arranged by Letter of Agreement
with the controlling ATC wherein
gliders may be allowed to fly under
VFR in Class A Airspace at certain
times and to certain specified altitudes.
WEIGHT—Acting vertically through
the glider’s center of gravity, weight
opposes lift.
WIND TRIANGLE Navigational
calculation allowing determination
of true heading with a correction
for crosswinds on course.
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本文链接地址：
Glider Flying Handbook(169)
