ESDU 96026:2014

ESDU 96026 provides an empirical method applying to a spoiler on
one wing panel. The drag increment is considered as the sum of a
profile drag component and an induced drag component which includes
the effect of deploying a trailing-edge flap. The increment in
yawing moment arises from the direct moment associated with the
drag increment but includes an indirect effect due to the sidewash
at the tail unit caused by the spoiler flow field. Comparisons are
shown of the predicted results against experimental data. A worked
example illustrates the use of the method.

A computer program of the method is provided as ESDUpac
A9626.