Turboprop on 20 September 1945. From their experience with the Trent, Rolls-Royce developed the Rolls-Royce Clyde, the first turboprop engine to be fully type certificated for military and civil use, and the Dart, which became one of the most reliable turboprop engines ever built. Dart production continued for more than fifty years. The Dart-powered Vickers Viscount was the first turboprop aircraft of any kind to go into production and sold in large numbers. It was also the first four-engined turboprop. Its first flight was on 16 July 1948. The world's first single engined turboprop aircraft was the Armstrong Siddeley Mamba-powered Boulton
British Aircraft Corporation operational today as Bristol Cars. Most of the BAC designs were taken over from the individual companies that formed it. BAC did not apply its new identity retrospectively, hence the VC10 remained the Vickers VC10. Instead the company applied its name to marketing initiatives, the VC10 advertising carried the name "Vickers-Armstrongs (Aircraft) Limited, a member company of the British Aircraft Corporation". The first model to bear the BAC name was the BAC One-Eleven (BAC 1–11), a Hunting Aircraft study, in 1961. Bristol had eschewed the subsonic airliner market and was working on the Bristol 223 supersonic transport, which was eventually