時間：2011-03-11 23:18來源：藍天飛行翻譯 作者：航空 點擊：次
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stability (aircraft flight condition). The characteristic of an aircraft that causes it to return to its original attitude after it has been disturbed from this condition. stability (meteorology). A state of the atmosphere in which the vertical distribution of temperature is such that a parcel of air will resist displacement from its initial level. stabilizer (airplane control surface). The fixed horizontal tail surface on an airplane. The stabilizer is set on the airplane so it provides the correct amount of stabilizing downward aerodynamic force when the aircraft is flying at its normal cruise speed. The elevators are hinged to the trailing edge of the stabilizer. stabilons (airplane control surface). Small wing-like horizontal surfaces mounted on the aft fuselage of some airplanes to improve longitudinal stability. Stabilons are installed on airplanes that have an exceptionally wide center of gravity range. stable isotope. An isotope of an element that does not undergo radioactive disintegration. An unstable isotope, or radioisotope, emits radioactive energy as it decays. stage length. The distance between landing points in airline operation. stage of a compressor (turbine engines). One disk of rotor blades and the following set of stator vanes in an axial-flow compressor. stagger (airplane rigging). The relationship between the longitudinal location of the two wings of a biplane. If the upper wing is further forward than the lower wing, the airplane has positive stagger; but if the lower wing is ahead of the upper wing, the airplane has negative stagger. staggered timing (reciprocating engine ignition). A method of timing the dual ignition of a reciprocating engine. When the timing is staggered, the spark plug nearest the exhaust valve fires before the spark plug nearest the intake valve. In some engines, the exhaust gases are not completely scavenged, and they dilute the fuel-air charge in the cylinder. This diluted charge near the exhaust valve burns more slowly than the undiluted charge near the intake valve, and it is therefore ignited earlier. stagger wires (airplane rigging component). High-strength steel wires that connect diagonally fore and aft across the cabane struts of an biplane. Adjustment of the length of the stagger wires determines the fore-and-aft relationship of the upper wing to the lower wing. stagnation point (fluid dynamics). A location on a body in a stream of moving fluid at which the fluid has stopped—it has no velocity. The stagnation point on an airfoil is at the leading edge where the air splits, with some air passing over the top of the airfoil and the rest passing below it. stain (finishing material). A form of nonprotective finish used on wood to color the wood without hiding the grain. After a piece of wood is stained, it is usually covered with varnish to protect it. stainless steel. An alloy of iron, chromium, and nickel that is resistant to rust and corrosion. Stainless steel is more correctly called corrosion-resistant steel. |
