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Keywords: 1930s pursuit aircraft fighter piston prop vintage blackandwhite monochrome vehicle airplane outdoor black and white 3/4-front view of the Douglas XA-2. Note the lack of cowling on the lower nose to enhance cooling air flow over the cylinder heads of the inverted Liberty engine. (U.S. Air Force photo) 3/4-front view of the Douglas XA-2. Note the lack of cowling on the lower nose to enhance cooling air flow over the cylinder heads of the inverted Liberty engine. (U.S. Air Force photo) |