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| Tumansky R-79 | |
|---|---|
| Name | Tumansky R-79 |
| Type | Afterburning turbojet |
| Country | Soviet Union |
| First run | 1970s |
| Manufacturer | OKB-300 Tumansky |
| Status | Prototype/cancelled |
Tumansky R-79 was a Soviet afterburning turbojet prototype developed in the late 1960s and early 1970s by OKB-300 under the leadership of Sergei Tumansky, intended for high-performance interceptors and supermaneuverable fighters. The program intersected with design bureaus such as Mikoyan, Sukhoi, and Yakovlev and with ministries like the Ministry of Aviation Industry, competing with powerplants from Klimov and Ivchenko-Progress during the Cold War and Anglo-American aerospace developments.
Development began as part of Soviet initiatives to match Pratt & Whitney J58, Rolls-Royce/Snecma Olympus, and General Electric J79 performance for sustained supersonic flight and high-altitude interception roles. The project received direction from figures linked to Nikolai Kuznetsov era design philosophy and drew on turbomachinery research from institutes such as TsIAM, TsAGI, and MBI, while interacting with requirements issued by the Ministry of Defence and the Council of Ministers. Flight-test programs were planned alongside experimental airframes from Mikoyan-Gurevich, Sukhoi Design Bureau, and Yak-41-era concepts, and coordination involved enterprises like Znamya Truda factories and the Moscow Aviation Institute. International context included contemporaneous efforts by Northrop, McDonnell Douglas, and Dassault to field high-thrust low-weight engines.
The R-79 featured a two-spool axial-flow core with an annular combustion chamber and variable geometry nozzle concept influenced by work at TsIAM and Bristol-based research linked to Harrier V/STOL exhaust vectoring studies. Compressor stages reflected lessons from earlier engines such as the R-11, R-13, and R-15, and materials selection referenced refractory alloy programs led by institutes like NIIstali and VNIIMet. Thermodynamic aims targeted high turbine inlet temperature comparable to engines by Snecma, Rolls-Royce, and General Electric, with afterburner architecture evaluated against US designs like the J79 and J58. Control systems were to integrate analog FADEC predecessors similar to projects at NPO Avtomatika, while testing of friction bearings, fuel systems, and start-up sequences involved collaboration with TsIAM test stands and the Gromov Flight Research Institute. Projected specifications included thrust class, specific fuel consumption, and weight comparable to contemporary Soviet engines such as Klimov VK-10 and Ivchenko AI-25 families, with nozzle thrust-vectoring options considered for maneuverability enhancements.
Planned variants spanned non-afterburning and afterburning versions, naval adaptations, and high-altitude intercept derivatives intended for platforms analogous to Su-27-class roles and carrier-capable designs paralleling MiG-29K development trajectories. Specialized versions were proposed for V/STOL concepts influenced by Yak-141 studies and VTOL experiments at the Gromov Institute, and maritime patrol derivatives were envisaged with corrosion-resistant materials similar to programs by Zaporozhye enterprises. Some conceptual variants explored mixed propulsion combinations akin to mixed-cycle proposals by Soviet spaceplane research teams and were discussed in inter-bureau technical councils alongside Klimov, Ivchenko, and Tumansky projects.
The R-79 program remained largely at bench-test and prototype stages, with engine test-beds run at TsIAM and static trials at the Gromov Flight Research Institute rather than entering mass production or frontline service with the Soviet Air Forces or Naval Aviation. Competing procurement decisions favored established engines like the Klimov RD-33 and Saturn/Lyulka AL-31, shaped by cost, reliability, and industrial capacity considerations debated in meetings involving the Council of Ministers, Ministry of Aviation Industry, and aerospace bureaus such as OKB-29 and NPO Saturn. Cold War export dynamics and cooperation with Warsaw Pact air arms, and pressures from NATO developments including F-15 Eagle, F-16 Fighting Falcon, and F-14 Tomcat performance benchmarks, influenced cancellation and resource reallocation.
Although intended for advanced interceptors and multirole fighters, the R-79 did not reach operational installation on service aircraft; proposed platforms included designs from Mikoyan, Sukhoi, and Yakolev bureaus, and conceptual fits were examined for projects related to the Su-27 family and naval fighter initiatives. Testbed installations were planned on prototypes similar to the way other engines were trialed on converted airframes such as modified MiG-21 and converted Il-76 test platforms used by TsIAM and Gromov for propulsion evaluation. Collaborative evaluations considered integration with avionics suites developed by NPO Vympel and radar fits comparable to those in Sukhoi Su-27 prototypes.
Remaining artifacts and components associated with the R-79 project are scarce; pieces and mockups have been reported in technical archives and museum exhibits related to Soviet propulsion history, including collections at the Central Air Force Museum near Monino, the Gromov Flight Research Institute museum, and displays curated by the Moscow Aviation Institute and TsIAM archives. Exhibits focusing on Cold War aerospace development often juxtapose Tumansky work with engines on display from Klimov, Ivchenko-Progress, Lyulka, and NPO Saturn to illustrate design evolution, with some documentation retained in state archives linked to the Ministry of Aviation Industry and military-technical museums in Moscow and Zhukovsky.
Category:Aircraft engines