时间:2011-03-11 23:11来源:蓝天飞行翻译 作者:admin 点击:次
Bowden cable (aircraft control system). A form of control system which uses a spring steel wire, enclosed inside a helically wound wire casing. A Bowden cable transmits both pushing and pulling motion to the device being actuated. Bowden cable systems are often used for moving such aircraft engine controls as the throttle and the mixture control. bowline knot. A handy knot used for such aeronautical purposes as securing an aircraft to prevent wind damage. A properly tied bowline knot will not slip, and it is easy to untie. bow wave (supersonic aircraft flight). A shock wave which forms when an aircraft is flying at a speed faster than the speed of sound, a speed greater than Mach one. A bow wave either forms immediately ahead of the aircraft or is attached to the nose of the aircraft. box beam (aircraft structural member). The main spanwise structural member of a wing made in the form of a box. Tensile and compressive stresses are carried in the top and the bottom of the box beam, and the sides act as webs to give the beam rigidity. The top and bottom of the box beam oppose the greatest loads and are the strongest parts of the beam. A box beam is also called a box spar. box brake (metal-forming shop tool). A metal-forming machine similar to a leaf, or cornice, brake. It is used to make straight bends across a piece of sheet metal. braid (electrical shielding and bonding component). A woven metal tube used to encase a wire carrying alternating current. This braid, called shielding, intercepts the electromagnetic field produced by the AC and prevents the field causing radio interference. |