The second prototype Viscount was named the Type 663 and was built as a testbed. This aircraft fitted with two Rolls-Royce Tay (turbojet) engines and first flew in RAF Markings as VX217 at Wisley on 15 March 1950. It was demonstrated at the Farnborough SBAC Show in September and was later used in the development of powered controls for the Valiant bomber. Subsequently, Boulton Paul Ltd used it as a test bed for electronic control systems until scrapping in 1960 at Seighford airfield, Staffordshire.
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