RS-68
The original gas-generator-cycle hydrogen engine developed for Delta IV's common booster core.
Identity
- Domains
- spaceflight
- Identity Level
- model
- Kind
- liquid-rocket-engine
- Name
- RS-68
- Status
- retired
Details
- Description
- The original gas-generator-cycle hydrogen engine developed for Delta IV's common booster core.
- Family
- Propellants
- liquid hydrogenliquid oxygen
- Rocket Specs
- Chamber Count
- 1
- Cycle
- gas generator
- Sea Level Specific Impulse S
- 357
- Sea Level Thrust Kn
- 2,949
- Vacuum Specific Impulse S
- 409
- Vacuum Thrust Kn
- 3,372
Links
Assets & Meta
- Creation Time
- July 29, 2026 at 09:31:28 UTC
- Updated Time
- July 29, 2026 at 09:32:26 UTC
Other
- Sources
- Accessed Date
- 2026-07-29
- Publisher
- United Launch Alliance
- Title
- Final Delta IV Heavy launch
- Accessed Date
- 2026-07-29
- Publisher
- NASA Technical Reports Server
- Title
- Liquid Rocket Propulsion: RS-68 and Linear Aerospike
- 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
- Delta IV Medium official vehicle reference