- Industria: Aviation
- Number of terms: 16387
- Number of blossaries: 0
- Company Profile:
Aviation Supplies & Academics, Inc. (ASA) develops and markets aviation supplies, software, and books for pilots, flight instructors, flight engineers, airline professionals, air traffic controllers, flight attendants, aviation technicians and enthusiasts. Established in 1947, ASA also provides ...
A vaned wheel used to move and add energy to a fluid. The fluid enters the center of the impeller and is thrown outward by centrifugal force. As the fluid leaves the impeller, it is collected in a diffuser where it is slowed and its pressure is increased.
Impellers can move either liquids or gases. Some applications are: moving cooling fluid through a reciprocating engine, compressing the air before it goes into the carburetor of a reciprocating engine, and compressing the air in a gas turbine engine.
Industry:Aviation
A vane-type, engine-driven fuel pump that has a diaphragm connected to the pressure-regulating valve. The chamber above the diaphragm is vented to the carburetor upper deck where it senses the pressure of the air as it enters the carburetor.
The diaphragm allows the fuel pump to compensate for altitude changes and keeps the carburetor inlet fuel pressure a constant amount higher than the carburetor inlet air pressure.
Industry:Aviation
A variable displacement pump which moves fluid by taking it into the center of a scroll-type impeller and slinging it outward by centrifugal action. Aircraft fuel boost pumps installed inside the fuel tanks are almost always centrifugal pumps.
Industry:Aviation
A variable radio-frequency electronic oscillator used with communications receivers when receiving unmodulated CW (continuous wave) signals.
The unmodulated CW has a frequency that is too high to hear, so it is mixed with the output of the BFO. When the BFO is adjusted so its frequency is nearly the same as that of the CW signal being received, the two signals beat together and produce an audio-frequency signal that can be heard. The frequency of this AF is the difference between the frequency of the unmodulated CW and that produced by the BFO.
Industry:Aviation
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.
Industry:Aviation
A vector by ATC which takes an aircraft off a previously assigned route. Altitudes assigned by ATC during such vectors provide required obstacle clearance.
Industry:Aviation
A vector quantity expressing both the speed an object is moving and the direction in which it is moving. “One hundred miles per hour” is a measure of speed, because it tells only the rate at which an object is moving. But “one hundred miles per hour, northward” is a measure of velocity. It tells both the rate and the direction the vehicle is moving.
Industry:Aviation
A vent line in an aircraft engine that allows the air pressure inside the engine crankcase to be the same as the pressure of the surrounding air.
An effective breather system prevents pressure building up inside the engine and forcing oil out of the crankcase.
Industry:Aviation
A venturi in a line between a turbine engine compressor or turbocharger and the pressurization system of an aircraft. When the air flowing through the venturi reaches the speed of sound, a shock wave forms across the throat of the venturi and restricts the flow. A sonic venturi is also called a flow limiter.
Industry:Aviation
A vertical stick in the cockpit of an airplane with which the pilot operates the ailerons and elevators. Side-to-side movement of the stick moves the ailerons, and back-and-forth movement moves the elevators. Most modern airplanes use control wheels, rather than control sticks.
Industry:Aviation
