![]() A few of the final B-24Ds had retractable two-gun belly turrets, but that feature did not become standard until the B-24G, which also introduced a powered nose turret midway through production. The first significant production version, and the first to be combat-worthy, was the B-24D. Turbo-superchargers were added to the R-1830-41 engines of the B-24C to maintain takeoff power to 25,000 feet. 50-caliber guns was added to the B-24C, as was a similar tail turret. The early B-24A had 1,200hp Pratt & Whitney R-1830-33 engines without turbo-superchargers, but no armor or self-sealing fuel tanks, and it was defended by six. The Liberator was continually improved throughout the war. Such rapid development of a new model resulted from fitting a new bomber fuselage to the wing and tail of the existing Model 31 flying boat and adding two engines.
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