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automatically controlling the aircraft.
AUTOROTATION—The condition
of flight during which the main rotor
is driven only by aerodynamic forces
with no power from the engine.
AXIS-OF-ROTATION—The imaginary
line about which the rotor
rotates. It is represented by a line
drawn through the center of, and perpendicular
to, the tip-path plane.
BASIC EMPTY WEIGHT—The
weight of the standard rotorcraft,
operational equipment, unusable fuel,
and full operating fluids, including
full engine oil.
BLADE CONING—An upward
sweep of rotor blades as a result of lift
and centrifugal force.
BLADE DAMPER—A device
attached to the drag hinge to restrain
the fore and aft movement of the rotor
blade.
BLADE FEATHER OR FEATHERING—
The rotation of the blade
around the spanwise (pitch change)
axis.
BLADE FLAP—The ability of the
rotor blade to move in a vertical direction.
Blades may flap independently
or in unison.
BLADE GRIP—The part of the hub
assembly to which the rotor blades are
attached, sometimes referred to as
blade forks.
BLADE LEAD OR LAG—The fore
and aft movement of the blade in the
plane of rotation. It is sometimes
called hunting or dragging.
BLADE LOADING—The load
imposed on rotor blades, determined
by dividing the total weight of the helicopter
by the combined area of all the
rotor blades.
BLADE ROOT—The part of the
blade that attaches to the blade grip.
BLADE SPAN—The length of a
blade from its tip to its root.
BLADE STALL—The condition of
the rotor blade when it is operating at
an angle of attack greater than the
maximum angle of lift.
BLADE TIP—The further most part
of the blade from the hub of the rotor.
BLADE TRACK—The relationship
of the blade tips in the plane of rotation.
Blades that are in track will move
through the same plane of rotation.
BLADE TRACKING—The mechanical
procedure used to bring the blades
of the rotor into a satisfactory relationship
with each other under dynamic
conditions so that all blades rotate on a
common plane.
BLADE TWIST—The variation in
the angle of incidence of a blade
between the root and the tip.
BLOWBACK—The tendency of the
rotor disc to tilt aft in forward flight as
a result of flapping.
GLOSSARY
G-2
BUNTOVER—The tendency of a
gyroplane to pitch forward when rotor
force is removed.
CALIBRATED AIRSPEED (CAS)
—Indicated airspeed of an aircraft,
corrected for installation and instrumentation
errors.
CENTER OF GRAVITY—The theoretical
point where the entire weight
of the helicopter is considered to be
concentrated.
CENTER OF PRESSURE—The
point where the resultant of all the
aerodynamic forces acting on an airfoil
intersects the chord.
CENTRIFUGAL FORCE—The
apparent force that an object moving
along a circular path exerts on the
body constraining the object and that
acts outwardly away from the center
of rotation.
CENTRIPETAL FORCE—The
force that attracts a body toward its
axis of rotation. It is opposite centrifugal
force.
CHIP DETECTOR—A warning
device that alerts you to any abnormal
wear in a transmission or engine. It
consists of a magnetic plug located
within the transmission. The magnet
attracts any metal particles that have
come loose from the bearings or other
transmission parts. Most chip detectors
have warning lights located on the
instrument panel that illuminate when
metal particles are picked up.
CHORD—An imaginary straight line
between the leading and trailing edges
of an airfoil section.
CHORDWISE AXIS—A term used
in reference to semirigid rotors
describing the flapping or teetering
axis of the rotor.
COAXIL ROTOR—A rotor system
utilizing two rotors turning in opposite
directions on the same centerline. This
system is used to eliminated the need
for a tail rotor.
COLLECTIVE PITCH CONTROL—
The control for changing the
pitch of all the rotor blades in the main
rotor system equally and simultaneously
and, consequently, the amount
of lift or thrust being generated.
CONING—See blade coning.
CORIOLIS EFFECT—The tendency
of a rotor blade to increase or
decrease its velocity in its plane of
rotation when the center of mass
moves closer or further from the axis
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ROTORCRAFT FLYING HANDBOOK2(78)
