The Hawker/Bristol funded P.1127 development began in 1957. The Bristol Pegasus engine (originally with only 11,000 lb thrust) was developed for the aircraft with heavy US funding support. It was based on the earlier Orpheus engine, and had a bifurcated jetpipe and vectoring front and rear nozzles.


The P.1127 made its first hover on 21 October 1960 on tethers, but this was not considered to be beneficial to feel out the aircraft response, so the first untethered hover was made less than a month later, on 19 November 1960. First conventional flight was made on 7 July 1961 and first double transition on 12 September 1961. Control power was low about all axes, which, combined with suck-down and limited height control power, resulted in a high pilot workload in hover. Hot gas ingestion was overcome with a low forward speed in takeoff and landing. One of the two initial test aircraft crashed, with the pilot ejecting safely. The British government began supporting the development before the first flight, funding the first two prototypes, and later four more.


Source: AHS V/STOL Wheel


Data on design, manufacture and status

Design authority: Hawker-Siddeley Aviation

Primary manufacturer: Hawker-Siddeley Aviation

Parent type: Hawker Harrier

Aircraft status: No longer flying


Primary flight and mechanical characteristics

VTOL type: Jet lift VTOL

Compound type: N/A

Lift configuration: Vectored thrust (x4)

Dedicated control device: Thruster (x4)

Crew required: 1

Crew seating: Single seater

Landing gear: Wheels (all retractable)

Overall Dimensions

Data on aircraft size

Engine Details

Aircraft powerplant (lift and/or propulsion)

Total number of engines: 1

Weights and Performance

Data on aircraft weight and flight characteristics

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