Each form of normal, steady aeroplane flight dictates a particular setting of the control surfaces and engine throttle. In whatever circumstances a desired steady motion may be pre‐arranged in this way, a completely stable aeroplane will establish of its own devices the speed and other conditions necessary for equilibrium. No help is demanded from the pilot, or from automatic operation of the controls, which are supposed to remain fixed, but only a sulficient space for transitional manoeuvring. It follows that if the aeroplane be subsequently disturbed, whether by accident or design, left to itself it will return to its arranged motion.
Piercy, N.A.V. (1931), "Aerodynamics for Engineers: VI.—An Introduction to the Study of Aeroplane Stability with a Section on Control", Aircraft Engineering and Aerospace Technology, Vol. 3 No. 3, pp. 67-75. https://doi.org/10.1108/eb029379
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