Were the Blackburn Blackburn and Avro Bison shaped mainly by their mission or by their engines?
Short answerMainly by the mission, especially the need for an observer's chart-working space.
NotesThe Avro Bison and Blackburn Blackburn needed enough room for a full map to be spread out inside the aircraft. That working-space requirement accounts for their large, awkward appearance. Their shape is attributed directly to the mission, rather than an engine choice.