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frequency can be changed).
resonant frequency (alternating current). The frequency of alternating current that produces the same
inductive reactance and capacitive reactance in a circuit. Capacitive reactance decreases as the frequency
increases, but the inductive reactance increases with the frequency. At only one frequency, the resonant
frequency (fr), the inductive reactance, and capacitive reactance are the same.
resonant frequency (mechanical vibration). The frequency at which a mechanical object vibrates, or
oscillates, with the maximum amplitude for the amount of energy used to produce the vibration. The
resonant frequency of an object is sometimes called its natural frequency.
respirator. A device worn over the mouth and nose of a person working in an atmosphere of dangerous
gases or contaminated air. Some respirators supply oxygen or clean air for the wearer, while others simply
filter the contaminants from the air.
restricted area. 14 CFR Part 1: “Airspace designated under Part 73 of this chapter within which the flight
of aircraft, while not wholly prohibited, is subject to restriction.”
restrictor (fluid-flow system component). An orifice installed in a fluid flow system to decrease the
amount of fluid allowed to flow under a specific amount of pressure.
resultant flux (aircraft magneto flux). The total magnetic flux that cuts across the secondary winding of
the magneto coil. Resultant flux is the combination of the permanent magnet flux and the flux produced by
current flowing in the primary winding of the coil.
Printed from Summit Aviation's Computerized Aviation Reference Library, 2/7/2007
Page 488
resultant vector. A single vector which is the sum of two or more vectors.
“Resume normal speed” (air traffic control). A phrase used by ATC to advise that previously issued
speed control (controller assigned or as part of a published procedure) restrictions are deleted. This
statement does not relieve the pilot of those speed restrictions which are applicable to 14 CFR, Part 91.117.
“Resume own navigation” (air traffic control). A phrase used by ATC to advise a pilot to resume his
own navigation responsibility. This is issued after completion of a radar vector or when radar contact is lost
when the aircraft is being radar vectored.
retard. To slow something down or cause it to operate later than it normally does. In a reciprocating engine,
the spark that ignites the fuel-air mixture inside the cylinders must be timed so the burning gases produce
the greatest amount of push on the piston. When the engine is started, the pistons move slowly, and the
spark must be delayed until the pistons begin to move downward. The spark for starting must be retarded.
retard breaker points (aircraft magneto component). An extra set of breaker points installed in aircraft
magnetos equipped with the “Shower of Sparks” starting system.
When the ignition switch is moved to the START position, a second set of breaker points is
connected in parallel with the normal breaker points. These points open later than the normal points, and
the spark does not occur inside the cylinder until the engine has rotated far enough beyond its normal firing
position for these retard points to open.
retarded sparks. The timing of the firing of the spark plugs used to start a reciprocating engine. The
sparks for starting occur later in terms of crankshaft rotation than those used for normal operation.
Retarding the sparks prevent the engine from kicking back when it is being started.
retarder (finishing system component). A special thinner used in some types of finishing material, such
as lacquer, to slow its drying time. When lacquer or dope dries too fast, the evaporation of the solvents
often drops the temperature of the surrounding air enough that moisture condenses out of the air onto the
wet finish. This causes the finish to blush, or become dull and porous.
Retarder, added to the lacquer or dope before it is sprayed onto the surface, keeps it from drying
too fast. When it dries slowly, the temperature does not drop enough to condense moisture out of the air.
retentivity (magnetism). The ability of a magnetizable material to retain the alignment of the magnetic
domains after the magnetizing force has been removed. Hard steel normally has a high retentivity, while
soft iron and electrical steel both have very low retentivity.
retort. A vessel used to distill a material. The material to be distilled is put into the retort and boiled.
Vapors from the boiling material are picked up from the top of the retort and cooled enough for them to
condense back into a liquid. The liquid is collected from the retort in a suitable container.
retrace line (cathode-ray tube). The line followed by the beam of electrons in a cathode-ray tube after it
　
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