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Pegasus

  • World's first Short Take Off and Vertical Landing (STOVL) engine

  • Thrust range up-to 23,800 lbf

The Pegasus powers the Harrier aircraft, providing full Short Take Off and Vertical Landing (STOVL) capabilities which eliminates the need for conventional runways.

The latest variant of the Pegasus, the 11-61, provides up to 15 per cent more thrust at high ambient temperatures, plus benefits of reduced maintenance and twice the hot-end life of earlier versions. These changes enhance the combat effectiveness, while cutting the cost of engine ownership.

This latest engine variant also enables a highly effective radar equipped version of the Harrier II. This aircraft, the Harrier II+, combines the proven advantages of day and night STOVL operations with an advanced radar system and beyond-visual-range missiles.

The engine is still in service today with the United States Marine Corps, but is no longer in production. Since its entry into service, more than 1,200 engines were produced accumulating more than 2 million flying hours.

The Pegasus vectored-thrust turbofan is a 2-shaft design featuring three low pressure (LP) and eight high pressure (HP) compressor stages driven by two LP and two HP turbine stages respectively. The combustor is annular and features vaporisers. The latest variant, the 11-61, is controlled by a Full Authority Digital Engine Control (FADEC) system. The engine employs a simple thrust vectoring system that uses four swiveling nozzles, giving the Harrier thrust for both lift and forward propulsion.

Specification

Pegasus 11-61/-408/Mk107

Pegasus 11-21 family

Thrust (lbf)

23,800

22,000

Bypass ratio

1.2

1.4

Pressure ratio

16.3

15.3

Length (in)

137

137

Diameter (in)

48

48

Basic weight (lb)

3,960

3,960

Compressor

3LP, 8HP

3LP, 8HP

Turbine

2HP, 2LP

2HP, 2LP

Applications


BAE SYSTEMS Harrier, Sea Harrier and Boeing/BAE SYSTEMS, Harrier II, Harrier II+ & AV-8B

* Technical data (ISA SLS)