The Aeroplane Speaks. Fifth Edition

=Wash=--The disturbance of air produced by the flight of an aeroplane. =Wash-in=--An increasing angle of incidence of a surface towards its wing-tip. [38] =Wash-out=--A decreasing angle of incidence of a surface towards its wing-tip. [39] =Wing-tip=--The right or left-hand extremity of a surface. [40] =Wire=--A wire is, in Aeronautics, always known by the name of its function. =Wire, Lift or Flying=--A wire opposed to the direction of lift, and used to prevent a surface from collapsing upward during flight. [41] =Wire, Anti-lift or Landing=--A wire opposed to the direction of gravity, and used to sustain a surface when it is at rest. [42] =Wire, Drift=--A wire opposed to the direction of drift, and used to prevent a surface from collapsing backwards during flight. =Wire, Anti-drift=--A wire opposed to the tension of a drift wire, and used to prevent such tension from distorting the framework. [44] =Wire, Incidence=--A wire running from the top of an interplane strut to the bottom of the interplane strut in front of or behind it. It maintains the "stagger" and assists in maintaining the angle of incidence. Sometimes termed "stagger wire." [45] =Wire, Bracing=--Any wire holding together the framework of any part of an aeroplane. It is not, however, usually applied to the wires described above unless the function performed includes a function additional to those described above. Thus, a lift wire, while strictly speaking a bracing wire, is not usually described as one unless it performs the additional function of bracing some well-defined part such as the undercarriage. It will then be said to be an "undercarriage bracing lift wire." It might, perhaps, be acting as a drift wire also, in which case it will then be described as an "undercarriage bracing lift-drift wire." It should always be stated whether a bracing wire is (1) top, (2) bottom, (3) cross, or (4) side. If a "side bracing wire," then it should be stated whether right- or left-hand.