Rolls Royce Pegasus 11 (Mk 103)

This powerful turbofan engine built by Rolls-Royce was fitted to the vertical take-off and landing (VTOL) British Aerospace Harrier, using vectored thrust to enable the aircraft to both fly conventionally and to hover.

The Pegasus engine was devised by Bristol-Siddeley to enable aircraft to combine fixed-wing and rotary wing capability. The engine's rotating nozzles could change the direction of thrust so that both conventional and hovering flight were possible. Early versions of the Pegasus powered experimental and prototype VTOL aircraft in the 1960s. The Pegasus 11 was developed by Rolls-Royce in 1974 and was used in the Harrier GR 3, Sea Harrier and AV-8A.