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Rolls-Royce Bristol Pegasus, engine of the vertical takeoff Harrier, in the Bristol Industrial Museum, England. Pegasus 1 (BE53-2) The two prototype engines were demonstrator engines which developed about 9,000 lbf (40 kN) on the test bed. Neither engine was installed in a P.1127. Pegasus 2 (BE53-3) Used in the initial P.1127s, 11,500 lbf (51 kN)
the rear of the F135 engine (nozzle rotated down) that powers the Rolls-Royce LiftSystem. Instead of using separate lift engines, like the Yakovlev Yak-38, or rotating nozzles for engine bypass air, like the Harrier, the "LiftSystem" has a shaft-driven LiftFan, designed by Lockheed Martin and developed by Rolls-Royce, [3] and a thrust vectoring nozzle for the engine exhaust that provides lift ...
Diagram of a Pegasus engine. Created on demand at w:en:Wikipedia:Graphics Lab/Illustration workshop. Date: 3 August 2013, 14:09 (UTC) Source: Own work: Author: Fama Clamosa (talk) 14:09, 3 August 2013 (UTC)
A full authority digital engine (or electronics) control (FADEC) is a system consisting of a digital computer, called an "electronic engine controller" (EEC) or "engine control unit" (ECU), and its related accessories that control all aspects of aircraft engine performance.
The equivalent vanes on the Rolls-Royce Nene reduced the inlet losses to the extent that thrust was increased from 4,000 to 5,000 lb at the same turbine temperature. [ 103 ] Modern subsonic inlet with rounded inlet lip to prevent boundary layer separation in cross winds on the ground and high angle of attack during take-off rotation.
Combined with thrust from the LiftFan (20,000 lbf or 89.0 kN) and two roll posts (1,950 lbf or 8.67 kN each), the Rolls-Royce LiftSystem produced a total of 41,900 lbf (186 kN) of thrust. [35] This compares with the maximum thrust of 23,800 lbf (106 kN) for the Harrier's Rolls-Royce Pegasus engine.
Only thrust-vectoring stood the test of time, with the introduction of the Rolls-Royce Pegasus bypass turbofan engine having separate vectoring nozzles for the cold fan (bypass) and hot exhaust flows, which first flew in the Hawker P.1127 VTOL research aircraft of 1960.
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