English Electric Canberra PR.7 - PR.9 prototype WH793

English Electric Canberra PR.7 (PR.9 prototype) WH793, at the 1955 SBAC Farnborough Air-show. A brand new PR.7 taken from the production line and converted by D. Napier and Sons Ltd. with increased chord centre-section and Rolls-Royce Avon 200-series engines. The wings had 3 ft 10 in increased span and 85sq ft more area. Flight testing of WH793 revealed that the service-ceiling fell short of the expected 65, 000 ft+, due to unexpected drag rise at high altitude

Air-show Altitude Avon Canberra Chord Converted Drag Expected Farnborough Increased Napier Pr.9 Revealed Rolls-royce Sbac Span Unexpected

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