时间:2011-03-11 23:18来源:蓝天飞行翻译 作者:航空 点击:次
wet-type vacuum pump. An engine-driven air pump which uses steel vanes lubricated with engine oil drawn into the pump through holes in the base. The oil passes through the pump, where it seals and lubricates, and is then exhausted with the air. Wet-type pumps must have oil separators in their discharge line to trap the oil and return it to the engine crankcase. wet wing (aircraft structure). A type of aircraft construction in which part of the wing structure is sealed and used as a fuel tank. Wet wings are more properly called integral fuel tanks. Wheatstone bridge (electrical circuit). A four-arm electrical bridge circuit used to measure resistance. An unknown resistance is placed in one arm of the bridge and is compared with a variable, or known, resistance in an opposite arm. When the variable resistor is adjusted until no current flows through the indicator, the bridge is balanced and the unknown resistance is exactly the same as that of the variable resistor. wheel well (aircraft structural component). A part of an aircraft structure that houses the landing gear when it is retracted. Wheel wells may be part of the wing, engine nacelle, or fuselage. whip antenna (radio antenna). A flexible, vertical antenna often used with high-frequency (HF) and very-high-frequency (VHF) radio equipment. The length of a whip antenna is one-quarter the wavelength of the frequency to which the antenna is resonant. A whip antenna is nondirectional; it transmits or receives its signals equally well in all directions. |