NK-21
UEC-Kuznetsov NK-21 is a historical LOX/kerosene liquid rocket engine developed for the N1 lunar launch vehicle fourth stage. Rostec reports approximately 41 tf (about 402 kN) thrust and states that testing of the N1-era engines concluded in 1967. The exact N1 installation is represented separately as four upper-stage engines.
Identity
- Aliases
- NK-21Kuznetsov NK-21N1 fourth-stage NK-21UEC NK-21
- Domains
- spaceflight
- Identity Level
- model
- Kind
- liquid-rocket-engine
- Name
- NK-21
- Status
- historical
Details
- Description
- UEC-Kuznetsov NK-21 is a historical LOX/kerosene liquid rocket engine developed for the N1 lunar launch vehicle fourth stage. Rostec reports approximately 41 tf (about 402 kN) thrust and states that testing of the N1-era engines concluded in 1967. The exact N1 installation is represented separately as four upper-stage engines.
- Developers
- Manufacturers
- Propellants
- keroseneliquid oxygen
Links
Assets & Meta
- Creation Time
- July 29, 2026 at 11:49:22 UTC
- Updated Time
- August 22, 2026 at 07:54:55 UTC
Other
- Sources
- Accessed Date
- 2026-07-29
- Publisher
- Rostec
- Title
- Moving upward: Kuznetsov space engines
- Accessed Date
- 2026-07-29
- Note
- Supports the legacy vehicle installation and the narrow canonical identity used for migration.
- Publisher
- Official vehicle or program source
- Title
- N1 Super-Heavy Launch Vehicle official vehicle reference
- Accessed Date
- 2026-07-29
- Publisher
- Rostec
- Title
- Nikolai Kuznetsov and his engines, part II