The de Havilland DH.108 Swallow was a three-aircraft British research family built to investigate swept-wing, tailless, and transonic flight after the Second World War. Retaining a Vampire-derived nacelle but adopting radically swept wings, the prototypes became a bridge between wartime jet research and the high-speed design work that informed later British aircraft; one reached supersonic speed in a dive in 1948.
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