时间：2011-03-11 23:13来源：蓝天飞行翻译 作者：admin 点击：次
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electrostatic energy. Energy stored by an electric stress in the dielectric of a capacitor when two opposing electrical charges act across the dielectric. When a battery is connected across the two plates of a capacitor, electrons are pulled from one plate and forced into the other. When all the electrons that can be moved by the battery have been moved, the capacitor is charged and no more current flows. The battery can be disconnected, but electron pressure still remains between the plates. This voltage across the dielectric (the voltage on the plates) is caused by electrostatic energy. electrostatic field. The space between two bodies that have opposite electrical charges. Lines of electrostatic force are considered to leave the negatively charged body and enter the body having the positive charge. The strength of the electrostatic field is determined by the number of electrons that make up the charge, and by the square of the distance separating the bodies. electrostatics. The aspect of electricity that deals with electrical charges caused by electrons that are stationary, or not moving. Electrodynamics is the aspect of electricity that deals with electrons in motion. elevator (airplane control). The horizontal, movable control surface in the tail section, or empennage, of an airplane. The elevator is hinged to the trailing edge of the fixed horizontal stabilizer. Moving the elevator up or down, by fore-and-aft movement of the control yoke or stick, changes the aerodynamic force produced by the horizontal tail surface. elevator downspring. A spring in the elevator control system that produces a mechanical force that tries to lower the elevator, and thus the nose of the airplane. In normal flight this spring force is overcome by the aerodynamic force from the elevator trim tab. But in slow flight with an aft CG position, the trim tab loses its effectiveness and the downspring lowers the nose to prevent a stall. elevon (airplane control surface). A combination elevator and aileron. Elevons are installed on the trailing edge of a delta wing or a flying wing airplane. Fore-and-aft movement of the control yoke causes the elevons to operate together. This causes the airplane to rotate about its lateral, or pitch, axis. Movement of the stick or control wheel to the right or left causes the elevons to move differentially. The left elevon moves up and the right elevon moves down. Differential movement of the elevons causes the airplane to rotate about its longitudinal, or roll, axis. ellipse. A figure formed when a plane cuts across the axis of a cylinder at an angle other than a right angle. ELT (emergency locator transmitter). A small self-contained radio transmitter carried in an aircraft. If the aircraft crashes, the force of the impact automatically sets the transmitter into operation, transmitting a series of down-sweeping tones on the two emergency frequencies of 121.5 and 243.0 megahertz. Searchers who receive the signal from the ELT are able to locate the wreckage by using radio direction finding equipment. |
