Pratt & Whitney Rocketdyne J-2X
Exact J-2X liquid-rocket-engine variant developed for the Ares/SLS upper-stage architecture. This packet creates propulsion identity only; no J-2 family link, actor attribution, vehicle relationship, or lineage edge.
Identity
- Aliases
- J-2XJ2XPratt & Whitney Rocketdyne J-2X
- Domains
- spaceflight
- Identity Level
- variant
- Kind
- liquid-rocket-engine
- Name
- Pratt & Whitney Rocketdyne J-2X
- Status
- unknown
Details
- Description
- Exact J-2X liquid-rocket-engine variant developed for the Ares/SLS upper-stage architecture. This packet creates propulsion identity only; no J-2 family link, actor attribution, vehicle relationship, or lineage edge.
- Lineage
- Note
- J-2X incorporated J-2S tap-off-cycle heritage and lessons while remaining a separate development engine.
- Related Propulsion System
- Relationship
- technology-derived-from
- Sources
- Nested value
- Nested value
Links
Assets & Meta
- Creation Time
- August 6, 2026 at 18:32:33 UTC
- Updated Time
- August 6, 2026 at 19:08:08 UTC
Other
- Sources
- Note
- NASA identifies J-2X as a distinct next-generation upper-stage engine, describes its SLS role and testing, and distinguishes it as a redesign of the heritage J-2.
- Publisher
- NASA
- Title
- J-2X Engine Ready for Higher Level of Tests
- Note
- NASA technical history documents J-2X as an evolved J-2 variant selected for Ares upper stages, with distinct performance and development requirements.
- Publisher
- NASA Technical Reports Server
- Title
- The J-2X Upper Stage Engine: From Heritage to Hardware
- Note
- NASA records J-2X development by Pratt & Whitney Rocketdyne for the SLS upper stage; current lifecycle is left unknown rather than inferred from historical development pages.
- Publisher
- NASA
- Title
- J-2X Engine Ready For Second Test Series