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
Vickers Valetta Vickers Valetta The Vickers Valetta is a British twin-engine military transport aircraft of the late 1940s. It was an all-metal mid-wing monoplane with a tailwheel undercarriage. The Valetta was a military transport development of the Viking civil airliner. The 58th Viking (c/n 158) became the prototype Valetta, which was first flown from Brooklands by test pilot Mutt Summers on 30 June 1947. The Valetta differed from the Viking fundamentally in being fitted with more powerful engines, a strengthened floor and large loading doors. Although named after the Maltese capital Valletta, the aircraft name is spelt with only one "l". The