Encyclopedia : Y : YB : YB4 (3 articles)

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YB-40 Flying Fortress
The Boeing YB-40 Flying Fortress was a modification of the B-17 Flying Fortress bomber aircraft, converted to act as a heavily-armed escort for other bombers during World War II. At the time of its development, long-range fighter aircraft such as the P-51 Mustang were not yet available to accompa..

 

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