RD-0125A
KBKhA single-chamber LOX/naphthyl liquid-rocket engine derived from the four-chamber RD-0124A for a proposed Angara-A5 third-stage upgrade. KBKhA publishes 29.5 tf vacuum thrust, 353 s vacuum specific impulse and 160 kgf/cm² chamber pressure; work is paused at the technical-project stage, so no flight or active-service status is asserted.
Identity
- Aliases
- RD-0125ARD0125AKBKhA RD-0125AAngara-A5 third-stage RD-0125A
- Domains
- spaceflight
- Identity Level
- variant
- Kind
- liquid-rocket-engine
- Name
- RD-0125A
- Status
- development
Details
- Description
- KBKhA single-chamber LOX/naphthyl liquid-rocket engine derived from the four-chamber RD-0124A for a proposed Angara-A5 third-stage upgrade. KBKhA publishes 29.5 tf vacuum thrust, 353 s vacuum specific impulse and 160 kgf/cm² chamber pressure; work is paused at the technical-project stage, so no flight or active-service status is asserted.
- Developers
- Lineage
- Note
- KBKhA identifies RD-0125A as a single-chamber LOX/naphthyl engine derived from the four-chamber RD-0124A for a proposed Angara-A5 third-stage upgrade; work is paused at the technical-project stage.
- Related Propulsion System
- Relationship
- direct-derivative-of
- Sources
- Accessed Date
- 2026-08-22
- Note
- The exact KBKhA RD0125A page identifies the engine as derived from RD-0124A for a proposed Angara-A5 third-stage upgrade and states that work is paused at the technical-project stage.
- Publisher
- Chemical Automatics Design Bureau (KBKhA)
- Title
- RD0125A
- Manufacturers
- Propellants
- liquid oxygennaphthyl
- Rocket Specs
- Chamber Count
- 1
- Vacuum Specific Impulse
- …
- Vacuum Thrust
- …
Links
Assets & Meta
- Creation Time
- August 15, 2026 at 04:12:54 UTC
- Updated Time
- August 22, 2026 at 08:20:13 UTC
Other
- Sources
- Accessed Date
- 2026-08-14
- Publisher
- Chemical Automatics Design Bureau (KBKhA)
- Title
- RD0125A
- Accessed Date
- 2026-08-14
- Publisher
- Chemical Automatics Design Bureau (KBKhA)
- Title
- Scientific and technical complex: RD0124/RD0124A modernization