Boeing B-17 Flying Fortress Four-Engined Heavy Bomber Aircraft
The legendary Boeing B-17 Flying Fortress accounted for over 290,000 sorties with 640,000 tons of ordnance dropped during World War 2.
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Though the Consolidated B-24 Liberator was built in greater numbers, the Boeing B-17 Flying Fortress is often regarded as the more important heavy bomber for the American Allies in the Second World War, accounting for over 290,000 sorties against ground installations and dropping over 640,000 tons of bombs. By war's end, the B-17 Flying Fortress was a mainstay in both the Pacific and European Theaters of War. The system became the symbol of American bomber might in the Second World War and continues with its legendary status even today. Incidentally, the name "Flying Fortress" is purported to have come from one of the reporters present during the unveiling of the machine at the Boeing plant, remarking as to how the aircraft looked like a 15-ton "flying fortress".
Designed to a US requirement for a four-engine bomber capable of long distance travel with a full 2,000lb bombload and reach speeds between 200 and 250 miles per hour. The result was the Boeing Model 229 which first flew in 1934, though was later lost to pilot error. Nevertheless, the US Army Air Corps pursued the design with an order for further developmental models fitted with differing powerplants. Early B-17 models were mostly developmental production variants that included the additions of seal-sealing fuel tanks, better armor protection and a redesigned tail. The initial definitive Flying Fortress model would arrive with 512 examples of the B-17E model which were the first to incorporated the twin .50 caliber tail armament for defense. This model was followed by the similar B-17F models of which 3,405 were produced. This latter model featured revised defensive armament positions. Often regarded as the ultimate B-17 production model, the B-17G featured the identifiable and effective Bendix powered chin turret fitted with 2 x 12.7mm machine guns under the nose. Revised turbochargers and an increase to 13 .50 caliber machine guns also arrived with this G model. In the end, the B-17G would account for over 8,600 units with production split between Boeing (4,035 samples), Douglas (2,395 samples) and Lockheed Vega (2,250 samples).