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In page 16th Bombardment Group:

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The B-29B was a limited production aircraft, built solely by Bell-Atlanta. It had all but the tail defensive armament removed, since experience had shown that by 1944 the only significant Japanese fighter attacks were coming from the rear. The tail gun was aimed and fired automatically by the new AN/APG-15B fire-control radar system that detected the approaching enemy plane and made all the necessary calculations. The elimination of the turrets and the associated General Electric computerized gun system increased the top speed of the Superfortress to 364 mph (586 km/h) at 25,000 feet (7,600 m) and made the B-29B suitable for fast, unescorted hit-and-run bombing raids and photographic missions.