Tumansky R-11
The Tumansky R-11 (initially AM-11) is a Soviet Cold War-era turbojet engine. == Design and development == The Tumansky R-11 was developed by A.A. Mikulin, Sergei Tumansky, and B.S. Stechkin as a twin-spool axial-flow high-altitude non-afterburning turbojet for Yakovlev Yak-25RV reconnaissance aircraft.