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The Douglas XB-42 Mixmaster was an experimental bomber aircraft, designed for a high top speed. The unconventional approach was to mount the two engines within the fuselage driving a pair of contra-rotating propellers mounted at the tail, leaving the wing and fuselage clean and free of drag-inducing protrusions.
Messerschmitt Me 329
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Hard to believe they were even considering a plane like this in '44/'45, don't you think?
Not that they were considering a tail - less airplane per say, but that they were considering anything that that couldn't be fielded with the absolute minimum of testing that late in the war. Despite the speeches it must have been clear to many that the war was coming to an end. ..and they were losing.