![]() Often the time between engine overhaul periods was five times that of the best piston engines. These were almost always turboprops, which had fuel economy on par with piston engine designs, but had far lower maintenance costs. This "hand-me-down" process of supplying aircraft continued with designs like the Convair 440 and Douglas DC-6 also serving in this role while the first jets were introduced.īy the mid-1950s, demand for even more economical designs led to the production of the first custom feederliners. Some smaller turboprop airliners were developed in the 1960s like the British Shorts Skyvan (19 seats, 1963), and French Nord 262 (29 seats, 1964) or Brazilian Embraer EMB 110 Bandeirante (1973). The first turboprop powered aircraft emerged like the Vickers Viscount (75 seats, introduced in 1953) and Fokker F27 (48–56 seats, 1958). The Fokker F27 Friendship was introduced in November 1958
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