YF-75D
YF-75D is the cryogenic liquid-hydrogen/liquid-oxygen engine used as a pair on the Long March 5 core second stage. CNSA-hosted technical material publishes 8.83 tonnes-force of vacuum thrust and identifies the engine as an expander-cycle design; these are recorded as per-engine model values rather than family-wide launch-vehicle capability.
Identity
- Aliases
- YF-75D hydrogen-oxygen engine
- Domains
- spaceflight
- Identity Level
- model
- Kind
- liquid-rocket-engine
- Name
- YF-75D
- Status
- active
Details
- Description
- YF-75D is the cryogenic liquid-hydrogen/liquid-oxygen engine used as a pair on the Long March 5 core second stage. CNSA-hosted technical material publishes 8.83 tonnes-force of vacuum thrust and identifies the engine as an expander-cycle design; these are recorded as per-engine model values rather than family-wide launch-vehicle capability.
- Propellants
- liquid hydrogenliquid oxygen
- Rocket Specs
- Cycle
- expander
- Vacuum Thrust Kn
- 86.6
Links
Assets & Meta
- Creation Time
- August 1, 2026 at 15:00:37 UTC
- Updated Time
- August 20, 2026 at 09:33:18 UTC
Other
- Sources
- Accessed Date
- 2026-08-20
- Note
- CNSA-hosted technical article identifies two YF-75D engines on the Long March 5 core second stage and publishes 8.83 tonnes-force of vacuum thrust per engine; the article identifies the engine as an expander-cycle hydrogen/oxygen engine.
- Publisher
- People Daily, republished by China National Space Administration
- Title
- Long March 5: numbers behind the rocket
- Accessed Date
- 2026-08-20
- Note
- CNSA material identifies YF-75D among the new hydrogen/oxygen expander-cycle engines developed for the Long March 5 family; no family-wide payload or vehicle performance is inferred here.
- Publisher
- China National Space Administration
- Title
- New features of the Long March 5 carrier rocket