Wire, Lift or Flying--A wire opposed to the direction of lift, and used
to prevent a surface from collapsing upward during flight.
Wire, Anti-lift or Landing--A wire opposed to the direction of gravity,
and used to sustain a surface when it is at rest.
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.
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.''
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 de-
scribed 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.
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