- Industry: 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 condition of fluid flow in which the flow is not smooth. The velocity of the flow changes rapidly, and the flow direction often reverses itself.
Industry:Aviation
A condition of fuel starvation that can occur in a reciprocating engine fuel system.
If the fuel in the line between the tank and the carburetor is heated enough to cause it to vaporize, a bubble of fuel vapor will form in the line. If the vapor pressure of this bubble is high enough, it will block the fuel and prevent it from flowing to the engine. This is a vapor lock.
Industry:Aviation
A condition of helicopter flight in which the machine holds a fixed position over the earth. When a helicopter is hovering, it is not moving in any direction relative to the terrain below it.
Industry:Aviation
A condition of operation of a semiconductor device, such as a transistor or a diode, in which a positive voltage is connected to the P-type material, and a negative voltage is connected to the N-type material. When the device is forward-biased, the barrier voltage is minimum, and the maximum amount of current can flow through it.
Industry:Aviation
A condition of permanent elongation of a turbine blade. Creep causes the turbine blades to actually grow in length when they are acted on by high temperature and high centrifugal loading.
Industry:Aviation
A condition of static stability in which an aircraft, if disturbed from its condition of rest, will neither attempt to deviate farther from this condition nor to return to its original condition.
Industry:Aviation
A condition of uneven lift produced by the rotor system of a helicopter when it is in forward flight.
When a helicopter is hovering in still air, the lift is uniform across its rotor disk. But when it is moving in flight, the blade traveling in the same direction as the helicopter, the advancing blade, has a speed equal to its own speed plus the speed of the helicopter. The blade on the other side, the retreating blade, has a speed equal to its own speed minus the speed of the helicopter.
Since the amount of aerodynamic lift is determined by airspeed, the difference between the airspeed over the rotor blades on the two sides of the helicopter causes the lift on the side of the advancing blade to be greater than the lift produced by the retreating blade.
Industry:Aviation
A condition of unstable airflow through the compressor of a gas turbine engine in which the compressor blades have an excessive angle of attack. Surge normally affects an entire stage of compression.
Industry:Aviation
A condition of wood which causes it to have low shock resistance so that it fails abruptly when it is bent.
Industry:Aviation
A condition that can exist in a reciprocating engine when an excessive amount of fuel is taken into the cylinders. Some of this fuel is still burning when it is forced out of the cylinders, and it continues to burn in the exhaust system.
Afterfiring is sometimes called torching.
Industry:Aviation
