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Summary: PDF The Boeing B-29 Superfortress was produced in large number of experimental and production models. The XB29, Boeing Model 345, was the first accepted experimental model delivered to the Army Air Corps, incorporating a number of improvements on the design originally submitted, including more and larger guns and self-sealing fuel tanks. Two aircraft were ordered in August 1940, and a third was ordered in December. The rest of this article provides overviews of the other variants of the basic B-29 design.