- 行业: 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 fluid-power actuator whose output is rotary movement. A hydraulic motor is a rotary actuator.
Industry:Aviation
A fluid-power pump used to force fluid through a hydraulic system. Hydraulic pumps may be engine driven, or they may be operated by an electric motor or by hand.
Industry:Aviation
A fog that conceals less than six tenths of the sky and is not a part of the cloud base.
Industry:Aviation
A force caused by electrons moving from one atom to another. A deficiency of electrons is called a positive charge, and an excess of electrons is called a negative charge. The difference in electrical charges causes electrical pressure. When electrical pressure forces electrons to move in a conductor, heat is produced, and a magnetic field surrounds the conductor.
Industry:Aviation
A force caused by the inertia of a moving body trying to keep the body moving in the same direction, at the same speed or, if the body is at rest, trying to keep it at rest. The momentum of a body is the product of its mass times its velocity.
Industry:Aviation
A force produced by air moving over a specially shaped surface called an airfoil. Lift acts in a direction perpendicular to the direction the air is moving. Airplane wings and helicopter rotors produce vertical lift, and propellers produce aerodynamic lift (thrust) in a horizontal plane.
The amount of aerodynamic lift is determined by the density of the air, the speed of the air, and the direction the air is flowing as it approaches the airfoil.
: L = (CL σ V2 S) / 295
: L = Lift (pounds)
: CL = Coefficient of lift (dimensionless)
: σ = Air density ratio (dimensionless)
: V2 = Square of airstream velocity (knots)
: S = Airfoil planform area (square feet)
: 295 = A constant used when velocity is given in knots
Industry:Aviation
A force that acts outwardly on any body moving in a curved path. Centrifugal force tries to move a body away from the center of its rotation, and this force is opposed by centripetal force.
Industry:Aviation
A force that causes or tries to cause an object to rotate. The moment of a lever is the distance, in inches, between the point at which a force is applied and the fulcrum, or the point about which a lever rotates, multiplied by the force, in pounds. Moment is expressed in inch-pounds.
Moment = distance . force
In weight and balance, a moment that causes a nose-down condition is a negative moment, and one that causes a nose-up condition is a positive moment.
Industry:Aviation
A force that produces a magnetic field. The magnetomotive force caused by current flowing in a coil of wire is determined by both the amount of current and the number of turns of wire.
The gilbert is the unit of magnetomotive force, with one gilbert being the amount of mmf needed to cause one maxwell (one line of magnetic flux) to flow through a magnetic circuit having a reluctance (the opposition to the passage of magnetic flux) of one unit. One gilbert is also the amount of mmf produced by 0.7957-ampere turn. The constant 0.7957 is 10 divided by four π.
Industry:Aviation
A force that produces or tries to produce rotation. torque limited (turboprop or turboshaft engine limitation). A limit placed on a turboprop or turboshaft engine that restricts the amount of power the engine is allowed to deliver to the propeller or to the rotor-drive system. This limit is imposed because of the strength of the drive-train mechanism or the strength of the aircraft structure. torque links (aircraft shock absorber component). A hinged link between the cylinder and piston of an aircraft shock absorber. Torque links prevent the piston from turning inside the cylinder, but they allow it to move up and down to absorb the landing and taxi shocks. Torque links are also called scissors and nutcrackers.
Industry:Aviation
