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Aviation History
1964
1964 - 1776.PDF
FLIGHT International, II June 1964 19 Simplified V/STOL installation and control with Bristol Siddeley vectored thrust engines Bristol Siddeley vectored thrust engines provide the sim- plest and most practical power systems for all V/STOL aircraft. The total thrust can be directed vertically for VTOL, at any required intermediate angle for STOL or in-flight manoeuvres, and horizontally for normal flight and for braking. Single Engined V/STOL Aircraft. A high-performance V/STOL aircraft, requiring a very high thrust in normal flight, can be powered by a single engine and thus benefit from the resulting lower manufacturing cost, simplified maintenance and higher rate of serviceability. Forward Facing Intake. Vectored thrust engines have air intakes facing forward in the orthodox way. They therefore avoid the problems and complications inevitable when separate lift and propulsion engines are used. Fixed Centre Of Thrust Whatever the angle of the nozzles, the resultant thrust always passes through the same point. This can be arranged to coincide with the aircraft centre of gravity. Simplicity Of Control. Control of the engine thrust direction can be eifected by a single lever control. This facilitates transitions and in-flight control and simplifies pilot training. The Bristol Siddeley Pegasus, powerplant of the Hawker Siddeley P 1127, has been flying since October 1960 and has effectively demonstrated the advantages of vectored thrust engines over all other forms of V/STOL power. Bristol Siddeley Engines Limited. Cen- tral Office: Mercury House, 195 Knights- bridge, London SW7, England. BRISTOL SIDDELEY SUPPLY THE POWER COVENTBY, NOBTH LONDON AND BRISTOL
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