R-11
Preserved Tumansky R-11 turbojet engine at thePolish 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

TheTumansky R-11 (initially AM-11) is aSovietCold War-eraturbojet engine.

TheTumansky R-11 was developed byA.A. Mikulin,Sergei Tumansky, andB.S. Stechkin as a twin-spoolaxial-flow high-altitude non-afterburning turbojet forYakovlev 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 theYakovlev Yak-26 andYakovlev Yak-27, as well as theYak-28.^[2] The R-11's basic design was very successful and it was later developed into theTumansky R-13 andTumansky R-25 along with the experimentalTumansky 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 onMiG-21F, P and U.
• R-11AF-300 - improved version forYakovlev Yak-28B, L and U.
• R-11F2-300 - new compressor, afterburner and nozzle, used onMiG-21P, PF and FL.
• R-11AF2-300 - R-11F2-300 adapted forYakovlev Yak-28I, R and P.
• R-11F2S-300 - upgraded version forMiG-21PFM, PFS, S, U and UM, and forSukhoi Su-15, UT and UM.
• Shenyang WP-7, Chinese license built copies of the R-11

• Sukhoi Su-15
• Mikoyan-Gurevich MiG-21
• Yakovlev Yak-25
• Yakovlev Yak-26
• Yakovlev Yak-27
• Yakovlev Yak-28

• Type: Afterburningturbojet
• 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

• Maximumthrust:
  
• 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.

• List of aircraft engines
• Pratt & Whitney J57

Wikimedia Commons has media related toTumansky R-11.

• LeteckeMotory.cz - R-11(in Czech) -(in Slovak)

• Tumansky aircraft engines
• 1950s turbojet engines

• Articles with short description
• Short description is different from Wikidata
• Commons category link from Wikidata
• Articles with Czech-language sources (cs)
• Articles with Slovak-language sources (sk)