The Northrop XP-56, informally called 'Black Bullet', was third of the pusher fighters conceived in 1940 (together with the Vultee XP-54 and Curtiss XP-55) and first flew on 6 September 1943 in secrecy at Muroc Dry Lake, California. It was the only one of the three designs to actually employ contra-rotating propellers and it was also the first true flying wing tested by the US Army.
Source: Fighters of the United States Air Force
Published byTemple Press/Aerospace.
