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refraction (radar technology). The bending of a radar beam by variations in atmospheric density, water
vapor content, and temperature.
refrigerant. A chemical compound used in a refrigerator or air conditioning system to absorb heat, then
carry it to another location where it is given up to the outside air.
refrigerant-12. The refrigerant that was formerly widely used in aircraft vapor-cycle air cooling systems.
Refrigerant-12 (R-12) is the name generally used for dichlorodifluoromethane, which is sold under such
registered trade names as Freon-12, Genetron-12, and Ucon-12. R-12 is being replaced by R-134a, which is
more environmentally friendly.
regeneration (electronic amplification). A method of increasing the gain of an amplifier by feeding part
of the amplified signal back into its input in phase with the input signal. If too much energy is fed back into
the input, the amplifier will oscillate and produce an unwanted signal, often in the form of a whistle, or
squeal. Regeneration is also called regenerative feedback or positive feedback.
regenerative braking (electrical braking). A method of slowing the rotating armature of an electric motor.
When the brake control switch is moved to the STOP position, it removes power from the motor and
connects the armature across an electrical load. As long as the armature is rotating, it produces electrical
Printed from Summit Aviation's Computerized Aviation Reference Library, 2/7/2007
Page 482
current, and power is required to force this current through the load. This power taken from the rotating
armature causes it to slow down.
registration certificate (aircraft document). A document issued by the FAA which shows the name and
address of the owner of the aircraft. The registration certificate must be displayed in the aircraft at all times.
regulated power supply (electrical power supply). An electrical device that changes line-voltage
alternating current into direct current with the required voltages. The regulator circuit causes the voltage to
remain constant as the load current varies.
regulator tube (electron tube voltage regulator). A gas-filled, glow-discharge electron tube. A regulator
tube is installed in parallel with the load across the output of a DC power supply. The regulator tube
maintains a constant voltage across its terminals, even as the current flowing through it changes.
reheat system. The British name for afterburner. See afterburner.
Reid vapor pressure. The amount of pressure that must be exerted on a liquid to keep it from vaporizing.
The vapor pressure of a liquid is affected by its temperature, and the Reid vapor pressure of a liquid is
specified at 100°F.
reinforce. To strengthen something by adding additional structural components or by using additional
material.
reinforcing tape (aircraft fabric covering component). A narrow strip of woven fabric material placed
over the fabric at the points it is being attached to the aircraft structure with ribstitching cord. The
reinforcing tape carries a large amount of the load and prevents the fabric from tearing at the stitches.
rejuvenation (aircraft finishes). The process of restoring resilience to an old dope film on a
fabric-covered aircraft. When aircraft dope is exposed to the sun for several years, the plasticizers migrate
from it, and the dope film become brittle and cracks. Rejuvenator, which is a mixture of strong solvents and
plasticizer, is sprayed over the old dope. The solvents penetrate the dope, and the plasticizer restores
resilience to the dope film.
rejuvenator (aircraft finishing material). A finishing material used to restore resilience to an old dope
film. Rejuvenator contains strong solvents to open up the dried-out dope film and plasticizers to restore
resilience to the old dope.
relative bearing (navigation). The number of degrees measured clockwise between the heading of the
aircraft and the direction from which the bearing is taken.
relative humidity. The ratio of the amount of water vapor in the air to the amount of water vapor the air
can hold at its present temperature.
relative motion. Motion of one object with reference to another. One object can be moving and the other
object still, or both objects may be moving, but at different rates, or directions.
relative vorticity (meteorology). Vorticity of the air relative to the earth, disregarding the component of
vorticity resulting from the earth’s rotation.
relative wind. The direction the wind strikes an airfoil.
relaxation oscillator. A type of electronic oscillator that changes direct current into pulsating DC with a
sawtooth waveform. A capacitor is charged through a resistor to produce a slow rise in voltage. At a
specified voltage, the gas in a gas-filled electron tube becomes ionized and conducts. The capacitor
　
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