ESDU 83040 gives a simple and rapid means of estimating the spanwise loading of a wide range of twisted wing planforms for unseparated subcritical flow. It is based on lifting-surface theory and extends, to take account of twist, the basic method of ESDU T.D.Memo 6403 for spanwise loading due to incidence of untwisted and uncambered wings. A simple artifice is used to represent any spanwise twist distribution by a combination of linear segments. From the linear representation, effective values of local twist are derived for use in the method. Spanwise loadings can be estimated either at a given incidence or for a given wing lift coefficient. The method is applicable to wing planforms for which bA lies between 1.5 and 12 and A tanf lies between 0 and 6, where b is root of one minus Mach number squared, f is half-chord sweep and A is aspect ratio. The wings can have any taper ratio, with straight, cranked or curved leading-edges. The method is illustrated by three detailed worked examples. ESDU 95010 introduces a program for the calculation of spanwise loading of wings with camber and twist based on the method of Multhopp-Richardson.