Rolls-Royce Pegasus

Pegasus / F402
Rolls-Royce Pegasus on display at the Royal Air Force Museum London
Type	Turbofan
National origin	United Kingdom
Manufacturer	Rolls-Royce
First run	September 1959
Major applications	Hawker Siddeley Harrier BAE Sea Harrier McDonnell Douglas AV-8B Harrier II
Number built	Over 1,200 (through 2008)
Developed from	Bristol Siddeley Orpheus

The Rolls-Royce Pegasus is a British turbofan engine originally designed by Bristol Siddeley. It was manufactured by Rolls-Royce plc. The engine is not only able to power a jet aircraft forward, but also to direct thrust downwards via swivelling nozzles.^[1] Lightly loaded aircraft equipped with this engine can manoeuvre like a helicopter. In particular, they can perform vertical takeoffs and landings.^[2] In US service, the engine is designated F402.

Originally the Bristol Siddeley Pegasus, the engine powers all versions of the Harrier family of multi-role military aircraft. Rolls-Royce licensed Pratt & Whitney to build the Pegasus for US built versions. However Pratt & Whitney never completed any engines, with all new build being manufactured by Rolls-Royce in Bristol, England. The Pegasus was also the planned engine for a number of aircraft projects, among which were the prototypes of the German Dornier Do 31 VSTOL military transport project.^[3]