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The Saunders Roe SR53 was designed in response to Specification F.124D for a rocket powered inteceptor. The resulting aircraft designed by Maurice Joseph Brennan was of orthodox construction with both wing and tail of delta planform, with provision for two Firestreak AAM's mounted on the wingtips. Unusually, the SR53 had an Armstrong Siddeley Viper jet engine mounted in the upper fuselage and a De Haviland Spectre variably-throttleable rocket engine using aviation kerosene and hydrogen peroxide as the oxidant mounted in the lower fuselage.