O of the main reasons for difficult roll control in the case of fore-wing controlled, cruciform missile-like configurations is the wing-tail interaction. Therefore the extent of wing shed vortex interaction with the tail is an important design factor. Some of the influencing parameters for this effect are the angle of attack, wing deflection angle, Mach number, and roll angle. The purpose of the present experiment is to determine the contribution of wing-tail interaction to overall roll controllability of a typical midwing controlled configuration. Force measurements were made at low speeds for both tail-off and tail-on configurations, at different wing deflection angles and angle of attack.