The Tumansky R-11 is a Soviet turbojet engine that was developed in the 1950s primarily to serve in the Soviet Air Force's newest combat aircraft. It powered various aircraft, such as the Mikoyan-Gurevich MiG-21 (Fishbed) interceptor and the Yak-28 bomber. The engine had a six-stage low pressure and a three-stage high pressure compressor, a can-annular combustor with 10 flame tubes, and a single-stage high pressure and a single-stage low pressure turbine. It could produce up to 60.6 kN of thrust with afterburner. The R-11 was later improved into the R-13 and R-25 engines, both of which were used for more or less the same.