THE Bristol Aeroplane Company entered the field of helicopter production when a design office was inaugurated at the wartime dispersal factory at Banwell, Somerset, in July 1944. The first Bristol helicopter flew in July 1947.
Stokes, F.W. (1951), "Notes on the Development of the Bristol 171 Helicopter: An Outline of the Distinctive Features of the Type that Were Evolved as a Result of Experience", Aircraft Engineering and Aerospace Technology, Vol. 23 No. 3, pp. 67-71. https://doi.org/10.1108/eb032007
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