From the NK-12 to the NK-33: the chief engine designer who powered Soviet skies and space
After the N-1 moon rocket was cancelled, Kuznetsov defied orders and hid dozens of NK-33 engines in a Samara warehouse. Thirty years later, American engineers tested them and called them the most efficient rocket engines ever built.
Nikolai Kuznetsov was the Soviet General Designer of aircraft and rocket engines who led OKB-276, creating turboprop, turbofan, and liquid-rocket engines that shaped aviation history. His NK-12 remains the most powerful turboprop ever built, powering the Tu-95 strategic bomber and An-22 transport, while the NK-32 became the heart of the Tu-160 supersonic strategic bomber. At Sergei Korolev's request he developed the closed-cycle NK-33 engine for the first stage of the N-1 moon rocket, engines that survived the program's cancellation in storage and were later refurbished for the American Antares rocket in the 1990s. Twice a Hero of Socialist Labor, a Lenin Prize laureate, and a full member of the USSR Academy of Sciences, he also served as a deputy to the RSFSR Supreme Soviet (1963–1990).
Activities and affiliations
Career Timeline
- 1930–1933Moscow Aviation College (evening) & mechanic at Plant No. 24
- 1933–1938Zhukovsky Air Force Engineering Academy (graduated with honors)
- 1938–1942Teaching/research at Zhukovsky Academy; defended candidate dissertation (1941)
- 1942Senior engineer, 239th Fighter Division, 6th Air Army (frontline)
- 1943–1949Ufa Aviation Plant No. 26 → Deputy Chief Designer → Chief Designer
- 1949–1994Chief Designer / General Designer, OKB-276 (later SNTK named after him), Kuybyshev/Samara
- 1963–1990Deputy, Supreme Soviet of the RSFSR
- 1974Full member, USSR Academy of Sciences
Related historical events
Engines of a Cancelled Moon Program Fly Again
The liquid-propellant engines Kuznetsov developed at Sergei Korolev's request for the first stage of the N-1 rocket did not end with the program itself. The NK-33, built in the late 1960s and early 1970s, and its vacuum-optimized derivative the NK-43, were intended to be deployed thirty and eight at a time on the first and second stages of the improved N1F. When the Soviet Union abandoned its crewed lunar landing effort in 1974, manufactured engines remained alongside two completed N1Fs, and a bureaucratic decision spared more than 60 of them in a warehouse. More than 150 NK-33 engines were reportedly produced in all, and as of 2011 the engine was rated the most efficient LOX/kerosene engine ever built in terms of thrust-to-mass ratio.
In the mid-1990s, after the Cold War, Russia sold 36 of the stored engines to the American firm Aerojet at US$1.1 million each. Aerojet refurbished them and renamed the modified engines the AJ26 series, and the Antares launch from NASA's Wallops Flight Facility on 21 April 2013 marked the first successful flight of NK-33 heritage engines built in the early 1970s. After the 2014 Antares launch failure, the American side dropped the AJ-26 first stage in favour of the RD-181, while in Russia RKTs Progress adopted stockpiled NK-33s for the first stage of the small-lift Soyuz-2.1v, which made its maiden flight on 28 December 2013.
That lineage ended as the stock ran out. The supply of NK-33 engines was reportedly exhausted by early 2025, and the Soyuz-2.1v made its final launch from Plesetsk on 5 February 2025, after 13 flights in all. The planned transition to the RD-193 was never completed, and the Angara 1.2 and Rokot-M were to take its place. The United States did not explore oxygen-rich kerosene combustion in earnest until the Integrated Powerhead Demonstrator project in the early 2000s, a delay that owed something to the technical difficulty of this engine, whose exposed metal surfaces had to carry an inert enamel coating against oxidation in the hot oxygen environment.