R-11 | |
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Preserved Tumansky R-11 turbojet engine at the Polish Aviation Museum | |

Type | Turbojet |

National origin | Soviet Union |

Manufacturer | Tumansky |

First run | 1956 |

Major applications | Sukhoi Su-15 Mikoyan-Gurevich MiG-21 Yakovlev Yak-28 |

Number built | 20,900 |

The **Tumansky R-11** (initially AM-11) is a Soviet Cold War-era turbojet engine.

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. This engine was the first Soviet twin-spool turbojet. It was first run in early 1956^{[1]} and was later employed in some variants of the Yakovlev Yak-26 and Yakovlev Yak-27, as well as the Yak-28.^{[2]} The R-11's basic design was very successful and it was later developed into the Tumansky R-13 and Tumansky R-25 along with the experimental Tumansky R-21. A total of 20,900 R-11 engines were built.

- R-11V-300 - first production version, high-altitude, non-afterburning
- R-11F-300 (R-37F) - afterburning version, entered production in 1956, used on MiG-21F, P and U.
- R-11AF-300 - improved version for Yakovlev Yak-28B, L and U.
- R-11F2-300 - new compressor, afterburner and nozzle, used on MiG-21P, PF and FL.
- R-11AF2-300 - R-11F2-300 adapted for Yakovlev Yak-28I, R and P.
- R-11F2S-300 - upgraded version for MiG-21PFM, PFS, S, U and UM, and for Sukhoi Su-15, UT and UM.
**Shenyang WP-7**, Chinese license built copies of the R-11

**Type:**Afterburning turbojet**Length:**4,600 mm (181.1 in)**Diameter:**906 mm (35.7 in)**Dry weight:**1,124 kg (2,477 lb)

**Compressor:**Axial compressor, 3-stage LP, 3-stage HP**Turbine:**one stage LP, one stage HP

**Maximum thrust:**- 38.7 kN (8,708 lbf) military power
- 60.6 kN (13,635 lbf) with afterburner
**Overall pressure ratio:**8.9:1**Turbine inlet temperature:**955 °C (1,750 °F)**Specific fuel consumption:**- 97 kg/(h·kN) (0.95 lb/(h·lbf)) at idle
- 242 kg/(h·kN) (2.37 lb/(h·lbf)) with afterburner
**Thrust-to-weight ratio:**3.51; 5.50 with afterburner.