THE function of the longitudinal control in an aeroplane is to provide at the will of the pilot a pitching moment of the necessary magnitude and the proper sign, to maintain (a) equilibrium throughout the range of angles of attack at which it is desired to fly the aeroplane; (b) a given angular velocity in pitch.
Metcalf, A.G.B. (1936), "Longitudinal Control: The Demerits of the Present System with Suggestions for Improvement", Aircraft Engineering and Aerospace Technology, Vol. 8 No. 4, pp. 109-111. https://doi.org/10.1108/eb030034
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