AS has often been iterated, the Harrier is a close support fighter with the facility for extremely short, or even zero, ground takeoff runs. This facility is achieved by directing the jet efflux of the RollsRoyce Bristol Engine Division Pegasus engine out of four rotating nozzles moving in symmetry, these rotating nozzles vectoring the engine thrust over 98 deg. of movement from aft to forward of the vertical. The nozzles are rotated by shafting and chains, powered by an air motor, and controlled by a single lever in the cockpit. The complete system is termed the Engine Nozzle Actuation System, and pilot selection and air motor output comprise the input and error signals of a simple servo loop controlling engine nozzle position Fig. 1.
Aircraft Engineering and Aerospace Technology – Emerald Publishing
Published: Feb 1, 1970
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