ESDU 76003:2012

ESDU 76003 gives expressions (in terms of wing geometry) for the
length, and position of the quarter-chord point, of the geometric
(or standard) mean and aerodynamic mean chords of a wing whose
leading- and trailing-edges are formed of straight line segments
and whose leadingand trailing-edges have any arbitrary number of
cranks; the wing has either pointed or straight streamwise tips.
For the special case of the straight-tapered wing, curves give the
lengths of the chords and their quarter chord position as a
function of taper ratio, centre-line chord, aspect ratio, and
quarter-chord sweep. Also given for that case are curves relating
the sweep angles of any two fixed percentage chord lines. Addendum
A shows how to obtain the geometry of a straight-tapered wing
equivalent to some arbitrary planform mounted on a fuselage so that
the two have the same aerodynamic characteristics. This technique
has been found most useful by ESDU as a means of correlating
lifting-surface aerodynamic data. Finally, Addendum B gives a
simple geometrical construction for obtaining the size and
longitudinal location of the aerodynamic mean chord for a
straight-tapered wing.