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reverse-flow combustor (gas turbine engine component). A type of turbine engine combustor in which
the air flowing from the compressor follows an S-shaped pattern and enters the combustor at its rear end.
As the air flows forward through the combustor, fuel is sprayed into it and burned. The burning fuel heats
and expands the air. After the hot gases leave the combustor, they complete the S-turn and flow rearward,
through the turbine.
Reverse-flow combustors allow the engine to be shorter than it could be if straight-through
combustors were used.
reverse-polarity welding. DC electric arc welding in which the electrode is positive with respect to the
work.
Printed from Summit Aviation's Computerized Aviation Reference Library, 2/7/2007
Page 490
reversible-pitch propeller (airplane propeller). An aircraft propeller whose blades can be moved to a
pitch angle that produces reverse thrust. Reversible-pitch propellers are used to decrease the length of the
landing roll needed by the airplane.
revision block (aircraft drawing). An area on an aircraft drawing, usually in the lower right-hand corner,
where a record is made of the number of the revision of the part shown in the drawing.
revolved section (aircraft drawing). A detailed view of a part cut from one of the main views of the
drawing and revolved to show its cross section.
Reynolds number (fluid mechanics). A dimensionless number used to determine the flow characteristics
of a fluid passing over a body. Reynolds number (RN) is determined by the velocity of the fluid, the
distance the fluid travels over the body, and the kinematic viscosity of the fluid. Kinematic viscosity is the
absolute viscosity of the fluid divided by its density.
RN = Vx / ν
V = Velocity in feet per second
x = Distance from leading edge in feet
n = kinematic viscosity in square feet per second
RF energy. Radio frequency energy. Electromagnetic energy with a frequency high enough that it will
radiate from any conductor through which it is flowing.
RFI (radio-frequency interference). Interference with the operation of radios, televisions, and other types
of electronic equipment caused by electromagnetic radiation. RFI is caused by spurious (unwanted and
unintentional) radiation of electromagnetic energy. Improperly filtered amateur radio transmitters,
radio-frequency electrical heaters, and certain types of medical equipment cause radio-frequency
interference.
rheostat (electrical component). A variable resistor having two connections to install it in a circuit. The
resistance element of a rheostat is made either of wire wound on a circular insulating card or of a carbon
compound molded onto a disk. A wiper moves across the resistance element to change the amount of
resistance put into the circuit.
A rheostat is similar to a potentiometer except that the potentiometer has three connections rather
than two.
RHI (range-height indicator) scope (radar meteorology). A radar indicator scope that displays a vertical
cross section of targets along a selected azimuth.
rhomboid. A plain, four-sided, closed figure in which the opposite sides are parallel, and the adjacent sides
have different lengths. None of the angles in a rhomboid are right angles (90° angles).
rhumb line (navigation). A line drawn on a navigational chart that crosses all the meridians of longitude at
the same angle.
rib (aircraft structure). The part of an aircraft wing structure that gives the wing its aerodynamic cross
section. Sheet metal or fabric covers the ribs and gives the wing its airfoil shape.
Printed from Summit Aviation's Computerized Aviation Reference Library, 2/7/2007
Page 491
ribbon direction (honeycomb material). The direction in a piece of honeycomb material that is parallel to
the length of the strips of material that make up the core.
ribbon parachute. A parachute whose canopy is made of a series of cloth tapes that resemble ribbons. A
ribbon parachute has less opening shock than a solid-canopy parachute because of the air escaping between
the ribbons.
rib lacing. See rib stitching.
rib stitching (aircraft fabric covering). A method of attaching fabric to the structure of an aircraft by
sewing it with a strong waxed string called rib-stitching cord. The cord is passed around the wing ribs,
through the top and bottom fabric, and over a reinforcing tape. Each stitch is locked with a modified seine
knot.
rib tread (tire tread). A series of circumferential grooves cut into the tread of a tire. A rib tread pattern
provides superior traction and directional stability on hard-surfaced runways.
rich flameout (gas turbine engine operation). A condition in which the flame in a gas turbine engine
goes out because of an overly rich fuel-air mixture. For fuel to burn in a turbine engine, it must be mixed
　
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