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high angles of attack required to compensate
for dissymmetry of lift. In a
gyroplane the stall occurs at 20 to 40
percent outboard from the hub.
RIGID ROTOR—A rotor system
permitting blades to feather but not
flap or hunt.
ROTATIONAL VELOCITY—The
component of relative wind produced
by the rotation of the rotor blades.
ROTOR—A complete system of
rotating airfoils creating lift for a helicopter
or gyroplane.
ROTOR DISC AREA—See disk
area.
ROTOR BRAKE—A device used to
stop the rotor blades during shutdown.
ROTOR FORCE—The force produced
by the rotor in a gyroplane. It is
comprised of rotor lift and rotor drag.
SEMIRIGID ROTOR—A rotor system
in which the blades are fixed to the
hub but are free to flap and feather.
SETTLING WITH POWER—See
vortex ring state.
SHAFT TURBINE—A turbine
engine used to drive an output shaft
commonly used in helicopters.
SKID—A flight condition in which
the rate of turn is too great for the
angle of bank.
SKID SHOES—Plates attached to
the bottom of skid landing gear protecting
the skid.
SLIP—A flight condition in which
the rate of turn is too slow for the
angle of bank.
SOLIDITY RATIO—The ratio of
the total rotor blade area to total rotor
disc area.
SPAN—The dimension of a rotor
blade or airfoil from root to tip.
SPLIT NEEDLES—A term used to
describe the position of the two needles
on the engine/rotor tachometer
when the two needles are not superimposed.
STANDARD ATMOSPHERE—A
hypothetical atmosphere based on
averages in which the surface temperature
is 59°F (15°C), the surface pressure
is 29.92 in. Hg (1013.2 Mb) at
sea level, and the temperature lapse
rate is approximately 3.5°F (2°C) per
1,000 feet.
STATIC STOP—A device used to
limit the blade flap, or rotor flap, at
low r.p.m. or when the rotor is
stopped.
STEADY-STATE FLIGHT—Acondition
when a rotorcraft is in straightand-
level, unaccelerated flight, and all
forces are in balance.
SYMMETRICAL AIRFOIL—An
airfoil having the same shape on the
top and bottom.
TAIL ROTOR—A rotor turning in a
plane perpendicular to that of the main
rotor and parallel to the longitudinal
axis of the fuselage. It is used to control
the torque of the main rotor and to
provide movement about the yaw axis
of the helicopter.
TEETERING HINGE—A hinge
that permits the rotor blades of a semirigid
rotor system to flap as a unit.
THRUST—The force developed by
the rotor blades acting parallel to the
relative wind and opposing the forces
of drag and weight.
TIP-PATH PLANE—The imaginary
circular plane outlined by the rotor
blade tips as they make a cycle of
rotation.
TORQUE—In helicopters with a single,
main rotor system, the tendency of
the helicopter to turn in the opposite
direction of the main rotor rotation.
TRAILING EDGE—The rearmost
edge of an airfoil.
TRANSLATING TENDENCY—
The tendency of the single-rotor helicopter
to move laterally during hovering
flight. Also called tail rotor drift.
G-5
TRANSLATIONAL LIFT—The
additional lift obtained when entering
forward flight, due to the increased
efficiency of the rotor system.
T R A N S V E R S E - F L O W
EFFECT—A condition of increased
drag and decreased lift in the aft portion
of the rotor disc caused by the air
having a greater induced velocity and
angle in the aft portion of the disc.
TRUE ALTITUDE—The actual
height of an object above mean sea
level.
TURBOSHAFT ENGINE—A turbine
engine transmitting power
through a shaft as would be found in a
turbine helicopter.
TWIST GRIP—The power control
on the end of the collective control.
UNDERSLUNG—A rotor hub that
rotates below the top of the mast, as
on semirigid rotor systems.
UNLOADED ROTOR—The state of
a rotor when rotor force has been
removed, or when the rotor is operating
under a low or negative G condition.
USEFUL LOAD—The difference
between the gross weight and the
basic empty weight. It includes the
flight crew, usable fuel, drainable oil,
if applicable, and payload.
VARIATION—The angular difference
between true north and magnetic
north; indicated on charts by isogonic
lines.
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ROTORCRAFT FLYING HANDBOOK2(81)
