where:

..\Images\IMG00138_shg.gif

are the control surface tab trim wheel gearing constants.

..\Images\IMG00139_shg.gif

is the control surface tab trim wheel position angle.

..\Images\IMG00140_shg.gif

is the control surface deflection angle.

..\Images\IMG00141_shg.gif

is the control surface tab deflection angle at zero-surface -deflection and neutral-wheel-position.