Douglas DC-4E
US airliner prototype with 4 piston engines, 1938
Douglas DC-4E
The Douglas DC-4E was an American experimental airliner that was developed before World War II. The DC-4E never entered production due to being superseded by an entirely new design, the Douglas DC-4/C-54, which proved very successful. Many of the aircraft's innovative design features found their way into the Nakajima G5N bomber after the single DC-4E prototype was sold to a Japanese airline and clandestinely dismantled for study by Nakajima at the behest of the Imperial Japanese Navy.
Read on Wikipedia · Image Carl Malamud, CC BY 2.0
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