The following images were taken at Fleet Air Arm Museum, Yeovilton Airfield
and kindly provided by Howard Mason.The Supersonic Transport Advisory Comittee was formed in 1956 and among its early tasks was the identification of potential design problems with a slender delta wing and the means of examining them. Specification ER.197D resulted in the H.P.115 the sole example of which, XP841, flew on 17 August 1961 at RAE Bedford. It had a narrow delta wing of 74.7° sweep and 20ft span while overall length was 50ft. The single Viper engine was mounted in a nacelle above the rear fuselage and the aircraft had a fixed undercarriage. The aircraft provided a considerable amount of invaluable data for the Concorde programme over the next four years and it was finally retired in 1974, currently being preserved at Yeovilton (source).
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