RL10C-3
The RL10C variant under development for the four-engine SLS Block 1B exploration upper stage.
Identity
- Domains
- spaceflight
- Identity Level
- variant
- Kind
- liquid-rocket-engine
- Name
- RL10C-3
- Status
- development
Details
- Description
- The RL10C variant under development for the four-engine SLS Block 1B exploration upper stage.
- Developers
- Dry Mass Kg
- 230.42
- Family
- Length M
- 3.1572
- Propellants
- liquid hydrogenliquid oxygen
- Rocket Specs
- Cycle
- expander
- Restartable
- Yes
- Vacuum Specific Impulse S
- 460.1
- Vacuum Thrust Kn
- 108.3
Links
Assets & Meta
- Creation Time
- July 29, 2026 at 09:03:47 UTC
- Updated Time
- August 22, 2026 at 01:32:55 UTC
Other
- Sources
- 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
- Space Launch System Block 1B official vehicle reference
- 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
- Space Launch System Block 2 official vehicle reference
- Accessed Date
- 2026-07-29
- Publisher
- NASA
- Title
- SLS RL10 Engine Fact Sheet
- Accessed Date
- 2026-08-15
- Note
- NASA identifies RL10C-3 as the four-engine Exploration Upper Stage variant for SLS Block 1B and records Pratt & Whitney as the RL10 developer.
- Publisher
- NASA
- Title
- Space Launch System RL10 Engine
- Accessed Date
- 2026-08-21
- Note
- L3Harris lists RL10C-3 for the SLS Exploration Upper Stage at 24,340 lbf thrust, 508 lb weight, 460.1 sec specific impulse, and 124.3 in length.
- Publisher
- L3Harris
- Title
- RL10 Engine