Boeing YB-40 Flying Fortress Boeing YB-40 Flying Fortress The Boeing YB-40 Flying Fortress was a modification for operational testing purposes of the B-17 Flying Fortress bomber aircraft, converted to act as a heavily armed gunship for other bombers during World War II. At the time of its development, long-range fighter aircraft such as the North American P-51 Mustang were just entering quantity production, and thus were not yet available to accompany bombers all the way from England to Germany and back. Work on the prototype, Project V-139, began in September 1942 by converting the second production B-17F-1-BO (serial number 41-24341) built. Conversion work was
RAF Bomber Command aircrew of World War II Airmen's memoirs mention flying over target areas below which were like "Dante's Inferno", with acres of red and orange flame punctuated by percussions shock waves as bombs exploded and, while sympathy with anybody on the ground is sometimes expressed, mention is usually made of the prior German Blitz bombing of Coventry and London. Wartime reports and aircrew memoirs make regular mention of intense brightly coloured violent explosions within the bomber stream which often showered clouds of sparks which aircrew referred to as "scarecrows" and believed were a type of pyrotechnic shell designed to scare aircrew. Post-war assessment confirmed that these