時間：2011-03-11 23:18來源：藍(lán)天飛行翻譯 作者：航空 點擊：次
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varnish (finishing material). A material used to produce an attractive and protective coating on wood or metal. Varnish is made of a resin dissolved in a solvent, and thinned until it is the proper viscosity to spray or brush. The varnish is spread evenly over the surface to be coated, and when the solvents evaporate, a tough film is left. Enamel is made by mixing a finely ground colored pigment into a varnish base. varnish (reciprocating engine damage). A hard, glass-like deposit that forms on the cylinder walls of a reciprocating engine when the lubricating oil bakes onto the surface. Varnish often forms on the cylinder walls of an engine that is not operated properly when it is first run after it has been overhauled. Varnish on the cylinder walls prevents the piston rings seating as they should. varsol (cleaning fluid). A petroleum product similar to naphtha. Varsol is used in aircraft maintenance shops as a degreaser. V-belt. An endless belt used to drive a pump or generator from a source of power. The cross section of a V-belt has the shape of a trapezoid, and it fits into V-shaped pulleys, with the top of the V-belt even with the top of the pulleys. V-blocks (wood). Blocks of wood with a V-shaped cut in one of their edges. Two V-blocks are used to hold a round object when clamping it in a vise. V-blocks (metal). A fixture that allows a shaft to be centered and rotated to measure any out-of-round condition. vector (aircraft navigation). Aircraft approaching a busy terminal area are directed from the ground by a process known as vectoring. The air traffic controller on the ground has radar contact with the aircraft, and by giving the pilot a vector, or a heading to fly, the aircraft can be positioned to avoid other traffic, to fly around bad weather, or be directed to a position from which a landing can be made. vector (mathematics). A quantity which has both direction and magnitude. vectored-thrust engine. A turbojet or turbofan engine whose exhaust nozzle is mounted on a swivel in such a way that it may be rotated in flight to produce forward, vertically upward, or rearward thrust. vector sum (mathematics). A single vector with the same magnitude and direction as a number of vectors would have if they acted on a single point, one at a time. The vector representing the vector sum is called the resultant vector, or just the resultant. veering (meteorology). Shifting of the wind in a clockwise direction with respect to either space or time. Veering, which is the opposite of backing, is commonly used by meteorologists to refer to an anticyclonic shift, clockwise in the northern hemisphere, and counterclockwise in the southern hemisphere. velocity. A vector quantity expressing both the speed an object is moving and the direction in which it is moving. “One hundred miles per hour” is a measure of speed, because it tells only the rate at which an object is moving. But “one hundred miles per hour, northward” is a measure of velocity. It tells both the rate and the direction the vehicle is moving. |
