Biplane--An aeroplane of which the main lifting surface consists
of a surface or pair of wings mounted above another surface or
pair of wings.
Bay--The space enclosed by two struts and whatever they are fixed to.
Boom--A term usually applied to the long spars joining the tail of a
``pusher'' aeroplane to its main lifting surface.
Bracing--A system of struts and tie wires to transfer a force from
one point to another.
Canard--Literally ``duck.'' The name which was given to a type of
aeroplane of which the longitudinal stabilizing surface (empennage)
was mounted in front of the main lifting surface. Sometimes
termed ``tail-first'' aeroplanes, but such term is erroneous,
as in such a design the main lifting surface acts as, and is, the
empennage.
Cabre--To fly or glide at an excessive angle of incidence; tail down.
Camber--Curvature.
Chord--Usually taken to be a straight line between the trailing and
leading edges of a surface.
Cell--The whole of the lower surface, that part of the upper surface
directly over it, together with the struts and wires holding them
together.
Centre (Line) of Pressure--A line running from wing-tip to wing-tip,
and through which all the air forces acting upon the surface may
be said to act, or about which they may be said to balance.
Centre (Line) of Pressure, Resultant--A line transverse to the
longitudinal axis, and the position of which is the resultant of the
centres of pressure of two or more surfaces.
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