时间：2011-03-11 23:18来源：蓝天飞行翻译 作者：航空 点击：次
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spike knot (wood defect). A knot that runs through the depth of a beam, perpendicular to the annual rings. Spike knots appear most frequently in quartersawed wood. spin (aircraft maneuver). A maneuver of an airplane in which one wing is stalled while the other wing continues to produce lift. An airplane is put into a spin by getting it very nearly into a stall and then quickly rotating it about its vertical axis by pushing on one of the rudder pedals. As the airplane rotates about its vertical axis, one wing moves backward and stalls. The other wing moves forward and picks up a bit of extra lift. The nose drops, and the airplane descends slowly, with the wing producing lift pulling it around in a spiral path. To recover from a spin, the nose is forced down so air flows over the stalled wing. With both wings producing lift, the airplane recovers from the spin. spinner (aircraft propeller component). A streamlined housing over the hub of the propeller. A spinner smooths the airflow as it enters the cooling openings in the engine cowling. It also gives the airplane a streamlined shape. spiral (aircraft maneuver). A maneuver in which an airplane descends in a steeply banked, turning flight path. A spiral is sometimes confused with a spin, but the two maneuvers are totally different. In a spin, one wing is stalled and the other is producing lift, while in a spiral, both wings produce lift. The airspeed does not increase as an airplane spins, but in a spiral, the speed can increase to a dangerous level if the spiral is allowed to continue. spirit level. An instrument used to determine whether or not something is level, or perpendicular to a line that points directly toward the center of the earth. A spirit level is a curved glass tube partially filled with liquid. Enough liquid is left out of the tube so there is a bubble in it. The tube is mounted in a long, straight metal or wood bar in such a way that when the bar is level, the bubble in the liquid is in the center of the tube. Spirit levels are also called bubble levels. spirit varnish. A finishing material for wood made of a resin dissolved in a volatile solvent such as alcohol. The varnish is brushed or sprayed on a surface, and it forms a hard, resin film when the solvent evaporates from it. splayed patch (plywood patch). A type of patch made in an aircraft plywood structure in which the edges of the patch are tapered for approximately five times the thickness of the plywood. A splayed patch is not recommended for use on plywood less than 1/10-inch thick. splice connector (electric wiring). A solderless, crimped-on connector used to join two wire ends. The splice connector is made in the form of an insulated metal tube. The insulation is stripped from the ends of the wires to be spliced, and the bare wire is slipped into the tube. The tube is then crimped onto the wire. A solderless splice connector forms a joint that is physically as strong as the wire, and it has an extremely low electrical resistance. See illustration for solderless connectors. |
