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. Since 1937 were produced SB with M100A engines and three-blade propellers. These aircraft became the basis of Soviet bomber aviation. SB took part in many armed conflicts in late 30s, such as Soviet-Japan conflict on the Khalkin-Gol river, Soviet-Finnish winter war and in the initial stage of WWII.
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