Northrop XB-35 on takeoff

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Taken from the escorting P-61, the XB-35's eight contra-rotating propellers are seen to advantage. Four Pratt & Whitney R-4360 Wasp Major engines each drove a pair of four-bladed propellers rotating in opposite directions by means of an extension shaft and specialized gear box. Unfortunately, chronic problems with the propeller governors and the complicated gear boxes doomed the innovative bomber to early extinction.

The basic concept was sound, however, and its 172-foot wingspan, sweepback angle, and total wing surface area were virtually identical to the B-2 which appeared decades later.

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Northrop XB-35 on takeoff

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