The prototype Bristol 170 was first flown at Filton, Bristol, on December 2,1945. The type became an instant success: 214 were built up to 1957. An all-passenger version, known as the Wayfarer, was available, but the most numerous was simply called the Freighter and its 6ft 8in (2m) sguare fuselage section and 31ft 8in long cargo floor permitted the carriage of bulky items. Built in 1947 Freighter G-AIFF served as the Mk.Ⅺ prototype with a longer wing, before being remodelled the following year to become the first of the more powerful Mk.21s and finally in 1949 as the initial, much-improved Mk.31.
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