- 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 projection used for laying out the grid of latitude and longitude for a chart or map. In a polyconic projection, the parallels of latitude are represented by arcs of a circle whose center is the north or south pole. The meridians of longitude are straight lines radiating from the poles.
Industry:Aviation
A projection used in mechanical drawing that shows a solid, rectangular object inclined in such a way that three of its faces are visible. An isometric projection is a form of axonometric projection.
Industry:Aviation
A propeller blade made of a number of materials such as metal, graphite, glass, or aramid fibers, and foam.
Industry:Aviation
A propeller governor is in its underspeed condition when the engine is operating at a speed lower than the governor calls for. The speeder spring holds the pilot valve down and the flyweights in. With the pilot valve down, the governor directs oil in the proper direction to decrease the pitch of the propeller blades. When the blade pitch decreases, the RPM increases, the governor flyweights spin out to an on-speed condition, and oil is trapped in the propeller to hold the pitch.
Industry:Aviation
A propeller installed on an aircraft engine whose propeller shaft faces the rear of the aircraft. Thrust produced by the propeller pushes the aircraft, rather than pulling it.
Industry:Aviation
A propeller mounted on an airplane in such a way that its thrust pulls the airplane through the air. Most modern airplanes use tractor propellers.
Industry:Aviation
A propeller on an aircraft engine that is driven from the crankshaft through a set of reduction gears. The engine is allowed to operate at a speed at which it is most efficient, and the propeller turns slowly enough that its tips do not exceed the speed of sound.
Industry:Aviation
A propeller shaft with a tapered end that fits into a tapered hole inside the propeller hub. A tapered propeller shaft is prevented from turning in the hub by a hardened steel key that fits in matching grooves in the shaft and the hub.
Industry:Aviation
A propeller shaft with splines along its periphery that fit into mating splines in the steel propeller hub. A splined propeller shaft is indexed to the hub by a master spline which allows the propeller to be installed with only one orientation to the engine crankshaft.
Industry:Aviation
A propeller whose blade pitch angle can be changed in flight. Takeoff is made with a low blade angle (low pitch) that allows the engine to develop its maximum power.
When the airplane is set up for cruise flight, the pitch of the blades is increased so the propeller advances farther through the air each revolution of the engine. This allows the engine to operate at a slower, more economical speed.
A controllable-pitch propeller and a constant-speed propeller are similar, the main difference being the control. The pitch of a constant-speed propeller is controlled by a governor, and the pitch of a controllable-pitch propeller is controlled by a manually actuated valve or switch.
Industry:Aviation
