The SB (High-speed bomber) was one of the world's first twin-engine bombers with smooth metal plating and retractable chassis. SB (ANT-40) has constructed in the Tupolev design bureau under the supervision of Archangelsky. It made his maiden flight in October 7, 1934. First serial aircraft were powered by M100 engines. They took part in Spanish Civil War (nicknamed 'Katiushka' by Republicans and 'Martin Bomber' by Nationalists). In total in 1936-1937 Soviet Union delivered near 70 SB planes. After the end of the Civil War SB were in Spanish Air Force service as bombers and trainer aircraft.
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