The control characteristics of aircraft employing direct-lift control

Abstract

Summary. The theory is developed for the control characteristics of aircraft in which direct lift is commanded directly by the pilots\\' stick. Basic requirements are established for acceptable response characteristics; of particular importance is the location at which direct lift acts relative to the centre of gravity, the aerodynamic centre, and manoeuvre point. The affective line of action of the control lift can be controlled by mechanical interconnections between the conventional pitch control and direct-lift systems. Potential benefits of direct-lift control include improved precision in landing large aircraft, more effective control of gust effects, and reduced possibility of stalling.