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 F.B.5 trainers. The Vickers company persisted with an active experimental program during the First World War period, including a line of single-seat pusher fighters that culminated in the Vickers F.B.26 Vampire of 1917-18, but the F.B.5 remained their only significant production aircraft until the Vickers Vimy bomber, which entered service too late to affect the war. Despite its moderate effectiveness, the Vickers F.B.5 did have a lasting legacy as German pilots continued to refer to British pusher aircraft as "Vickers-types". Many victories over D.H.2 or F.E.2b pushers were reported as destruction of a "Vickers". A flying replica of the F.B.5 Gunbus