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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skid (aircraft flight maneuver). A flight maneuver in which the aircraft is turned without using a steep enough angle of bank. Centrifugal force caused by the turning aircraft is not opposed by enough inward lift (from banking), and the aircraft skids out from its curved flight path away from its direction of turn. A skid is the opposite of a slip. In a slip, the angle of bank is too steep for the rate of turn, and the aircraft slides to the inside of the turn. skin antenna (aircraft antenna). A type of flush antenna (an antenna even with the surface of the aircraft skin). A part of the metal skin of the aircraft is electrically isolated by an insulating material and is used as the antenna conductor. Skin antennas are used on many high-speed aircraft. skin effect (radio-frequency electrical energy). The cause of the unequal distribution of radio-frequency alternating current throughout a conductor. AC at radio frequencies tends to have a greater current density (more current flow) on the surface of a conductor than it does near the center. Because of skin effect, some conductors used to carry high radio-frequency AC are hollow tubes. skin friction (aerodynamic drag). A type of aerodynamic drag caused by air flowing over the surface of the aircraft. Skin friction is a component of parasite drag. skin radiator. A type of radiator used on some of the liquid-cooled racing airplanes. The radiator is made of two thin sheets of brass, slightly separated so the heated coolant can flow between them. A skin radiator may be mounted on the surface of the wing, the sides of the fuselage, or on the floats of seaplanes. Air flowing over the smooth surface of the radiator removes heat from the coolant. skip distance (radio transmission characteristic). The distance from a radio transmitting antenna to the point on the surface of the earth the reflected sky wave first touches after it has been bounced off the ionosphere. ski plane. An airplane whose wheeled landing gear has been replaced with skis so it can operate from snow or ice. Some types of skis require the wheels to be removed, and others can be installed without removing the wheels. Retractable skis have a slot in their bottom surface so they can be pulled up enough for the wheel to protrude below the ski, enabling the airplane to land on a hard surface on its wheels. skip welding. A method of welding thin material. Skip welding is done in a series of short beads, with a space between each bead about as long as one of the beads. After the first series of beads is made, a second series is made between each of the first ones. Skip-welded material is less likely to warp than material welded with one continuous bead. Skip welding is sometimes called step welding. skull-cap spinner (propeller spinner). A small, conical, streamlined cover retained by a bracket attached to the hub of a fixed-pitch wood or metal propeller. The diameter of a skull-cap spinner is the same as that of the propeller hub. The spinner serves as a cover over the propeller retaining bolts or nuts and provides a degree of streamlining. |
