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
South East England Instruments of Byfleet developed the world's first multi-channel flight data recorders in 1965. Although the Comet is generally accepted as the world's first production-run jet airliner, the first jet airliner ever built (individual) was a Nene-powered Vickers VC.1 Viking on 6 April 1948 from Wisley Airfield; the world's first turboprop airliner would fly from there on 16 July 1948 by Mutt Summers. In 1939 at Cowes (Northwood) John Godeck invented the plan position indicator method of radar display as most commonly known ever since; the site became Plessey Radar in 1965, and currently is run by BAE Systems. Sperry Gyroscope