High Quality Content by WIKIPEDIA articles! The Northrop N-9M was a one-third scale aircraft used for the development of the Northrop XB-35 and YB-35 Flying Wing long-range bomber program. First flown in 1942, the N-9M (M for Model) was the third in a lineage of all-wing Northrop aircraft designs that began in 1929 when Jack Northrop succeeded in early experiments with his single-prop, twin-tailed, stressed metal skin Northrop Flying Wing monoplane, and a decade later, the dual-prop N-1M of 1939–1941. Northrop`s pioneering all-wing aircraft would lead Northrop-Grumman many years later to eventually develop the advanced B-2 Spirit stealth bomber, which debuted in Air Force inventory in 1989.