NK-31
UEC-Kuznetsov NK-31 is a historical LOX/kerosene liquid rocket engine developed as a modification of the N1 fourth-stage NK-21. Rostec reports approximately 41 tf (about 402 kN) thrust and states that NK-31 successfully passed testing; the cited material does not specify sea-level versus vacuum conditions. No flight installation is asserted.
Identity
- Aliases
- NK-31Kuznetsov NK-31N1 fourth-stage NK-31UEC NK-31
- Domains
- spaceflight
- Identity Level
- variant
- Kind
- liquid-rocket-engine
- Name
- NK-31
- Status
- historical
Details
- Description
- UEC-Kuznetsov NK-31 is a historical LOX/kerosene liquid rocket engine developed as a modification of the N1 fourth-stage NK-21. Rostec reports approximately 41 tf (about 402 kN) thrust and states that NK-31 successfully passed testing; the cited material does not specify sea-level versus vacuum conditions. No flight installation is asserted.
- Developers
- Lineage
- Note
- Rostec identifies NK-31 as the modification developed from the N1 fourth-stage NK-21.
- Related Propulsion System
- Relationship
- direct-derivative-of
- Sources
- Accessed Date
- 2026-07-29
- Publisher
- Rostec
- Title
- Moving upward: Kuznetsov space engines
- Manufacturers
- Propellants
- keroseneliquid oxygen
Links
Assets & Meta
- Creation Time
- July 29, 2026 at 11:49:25 UTC
- Updated Time
- August 22, 2026 at 07:54:08 UTC
Other
- Sources
- Accessed Date
- 2026-07-29
- Publisher
- Rostec
- Title
- Moving upward: Kuznetsov space engines
- Accessed Date
- 2026-07-29
- Publisher
- Rostec
- Title
- Nikolai Kuznetsov and his engines, part II