FROM the early clays of flying, aeroplanes have been provided with surfaces intended to give separate control about the rolling and yawing axes. In practice, however, the control surfaces themselves and the stability characteristics of the aeroplane combine to defeat the independence of rolling and yawing control. Recognition of this fact has lately resulted in attempts to arrange the stability characteristics of the aeroplane so that a combined rolling and yawing motion, of the type required in normal flying, is produced by only one control surface.
Aircraft Engineering and Aerospace Technology – Emerald Publishing
Published: Feb 1, 1936