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Wiki information Tumansky:
Sergei Konstantinovich Tumansky was a designer of Soviet aircraft engines and the chief designer in the Tumansky Design Bureau, OKB-300. He worked in TsIAM, at the aircraft-engine plant N 29, in Leah. He also worked as a substitute main designer in...
The Tumansky R-25 is a turbojet engine, which is seen as the ultimate development of Tumansky R-11. It was designed under the leadership of Sergei Alekseevich Gavrilov.