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The most constructed American plane at the time of World War II was the B-24 with 18 188 units. The B-24 proved to be an excellent and agile machine. The project started at the beginning of 1939 when the Consolidated Aircraft Corporation received a proposal from the USAAC to create a new bomber more modern and more effective than the one that was then in service, the Boeing B-17. The Chief engineer, Isaac Landon, chose to build the Liberator. The wings on the Liberator were longer than normal creating a larger load capacity and climbing speed. The first model flew on December 29, 1939 and then in 1940, USA ordered a first share of 36 planes. The first version to be produced in a large quantity was the D. With a total of 2 738 units, they were the first Liberator to really fight. Then came the E and G versions with different engines. A big evolution arrived on the 26th unit of the E version: the adoption of a mechanically-controlled turret on the nose. Next the B-24H (3 100 units) and J equipped with various transformations like new engine control instruments, etc. The L version (1 667 units) and M (2 593 units) were given improvements in the armament with the addition of new tail turrets and the N version had a simple vertical stabilizer.
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