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Hawker Siddeley Harrier GR.1 (PCB test aircraft)  XV798
(Bristol Aero Collection - 22 July 2001)

'Plenum Chamber Burning' (PCB) was an attempt to develop a form of afterburning engine for a supersonic STOVL aircraft (the proposed HS1154). One Harrier (XV798) was rebuilt to test the concept, with the modified engine in a longer fuselage. Although the aircraft never actually flew in this configuration, it did perform a number of 'flights' in a specially-built test rig. Despite some success the PCB approach was later discontinued, and the P1154 was cancelled anyway.

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