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. [4]
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.