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The B-29 was the best strategic bomber of World War II. 3970 Boeing B-29s were built, of which 2000 were delivered between 1943 and 1945. A large number remained in service until the end of the fifties. In 1937 the USAAC demanded that a strategic bomber able to transport 907 kg of bombs to more of 8000 km of distance to be built. Technicians of Boeing conceived from these requirements a set of experimental projects. Called Model 345, this new aircraft took part in a contest between the Consolidated, the Douglas and the Lockheed designs. On August 24, 1940, USA ordered the construction of several prototypes. 14 B-29s, were constructed by the end of the summer of 41 and immediately after, 500 and then 1000 other ones left the factories. The plane was a large monoplane and had a fuselage with an entirely pressurized circular section (to the exception of the bomb bay) and propelled by 4 radial turbo-compressors . Given of a heavy defensive armament, the B-29 was put in intensive production.
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