Boeing B-17 Flying Fortress

The B-17, a heavy high-altitude bomber, had its maiden flight in July of 1935 as the model 299 (unofficially XB-17). 13 Y1B-17-(B-17) one Y1B-17A-(B-17-A)-pre-series aircraft, as well as a small number of B-17B’s, B-17-C’s and B-17D’s followed for testing purposes. The first model to see active duty was the B-17E which incorporated the shape of the tail used by all later versions, and improved defensive armament (one 7,62-mm-MG and twelve 12,7-mm-MGs). 512 B-17E’s were built. The B-17F followed, which varied from the E model only in the nose canopy, which was framed, instead of being a bubble canopy. 3045 F models were built. Afterwards, 8.680 model B-17G’s followed. In the G model, defensive capability had been further improved, y incorporating a new chin turret, staggering the turrets on top of the fuselage, improved tail gun, and the ability to carry more additional ammunition.