sb, high-speed frontline bomber, generally sfb.the most mass-produced aircraft developed by kab tupolev. the speed of the ant-40 was one and a half times greater. speed of serial tb-3 bombers, and the nt-40 had smooth skin, the maximum speed exceeded 420 km / h, higher than ... foreign aircraft of the same class, well, this is a well-known story, in the thirty-seventh year tupolev was arrested on false charges of sabotage, he was imprisoned, worked in the central design bureau-29 of the nkvd, where he was one of the four chief designers, by the way, i saw this sharashka on radio street, it still exists, i think, if you go along radio street, there is an extreme right turn, and such a semicircular building at the top in a glass dome, they work there. this whole story was known as the tupolev sharaga. in prison, tupolev created the tu-2 aircraft, known as the nt-58 and the 103 aircraft, a twin-engine high-speed day, frontline bomber. legendary machines. many experts call it the best bomber in the war area. according to their data, it