時間：2011-03-11 23:13來源：藍天飛行翻譯 作者：admin 點擊：次
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double flare (rigid fluid line component). A flare made on a piece of rigid tubing in which the tubing in the flare is doubled back on itself to produce two thicknesses of metal in the flare. A double flare is acceptable in aircraft fluid systems on soft aluminum tubing having an outside diameter no larger than 3/8 of an inch. double-loop rib stitching (aircraft fabric attachment). A type of stitch used to attach fabric to an aircraft structure in which the rib-stitching cord is wrapped around the rib two times to form a double loop before the knot is tied. double magneto (reciprocating engine component). An aircraft engine magneto that uses a single rotating magnet to supply the magnetic flux for two magneto circuits. A double magneto has two coil assemblies, two sets of breaker points, and two distributors, but only one rotating magnet and one cam. doubler (sheet-metal structural component). A piece of sheet metal used to strengthen and stiffen an aircraft skin at the location some component is to be attached. A doubler is normally riveted to the inside of the aircraft skin where a radio antenna is mounted. double-row radial engine (reciprocating engines). A radial engine with two rows of cylinders whose pistons are connected to a single crankshaft. The crankshaft of a double-row radial engine has two throws, 180° apart. The master rod for the front row of cylinders attaches to one throw, and the master rod for the rear row of cylinders attaches to the other throw. Most double-row radial engines have either 14 or 18 cylinders. double-shear loading (riveted joint). A riveted joint that contains two shear planes. The total shear strength of the joint is approximately twice the shear strength of a joint with a single-shear load. double spread (adhesive application). The application of a layer of adhesive to each of the two surfaces being bonded together. |
