Aeon V
Aeon V is Relativity Space's vacuum-optimized LOX/methane rocket engine for Terran R's second stage. Relativity's current Terran R reference lists a high-pressure gas-generator cycle and 323,000 lbf (about 1,436.8 kN) of vacuum thrust per engine; its 2025 program update describes roughly 80% design commonality with Aeon R, with differences including nozzle size and vehicle interfaces. This record describes the engine model, not the Terran R installation.
Identity
- Aliases
- Aeon Vac
- Domains
- spaceflight
- Identity Level
- variant
- Kind
- liquid-rocket-engine
- Name
- Aeon V
- Status
- development
Details
- Description
- Aeon V is Relativity Space's vacuum-optimized LOX/methane rocket engine for Terran R's second stage. Relativity's current Terran R reference lists a high-pressure gas-generator cycle and 323,000 lbf (about 1,436.8 kN) of vacuum thrust per engine; its 2025 program update describes roughly 80% design commonality with Aeon R, with differences including nozzle size and vehicle interfaces. This record describes the engine model, not the Terran R installation.
- Developers
- Family
- Manufacturers
- Propellants
- liquid methaneliquid oxygen
- Rocket Specs
- Cycle
- gas-generator
- Vacuum Thrust Kn
- 1436.776
Links
- Official Url
- https://www.relativityspace.com/terran-r/
Assets & Meta
- Creation Time
- July 29, 2026 at 08:05:14 UTC
- Updated Time
- August 21, 2026 at 16:44:55 UTC
Other
- Sources
- Accessed Date
- 2026-08-21
- Note
- Relativity's current Terran R reference identifies Aeon V as the single vacuum engine on the second stage, using LOX-methane and a high-pressure gas-generator cycle and producing 323,000 lbf of vacuum thrust.
- Publisher
- Relativity Space
- Title
- Terran R
- Accessed Date
- 2026-08-21
- Note
- Relativity's 2025 program update describes the second-stage engine as vacuum-optimized, producing 323,000 lb of thrust, sharing roughly 80% design commonality with Aeon R, and differing in nozzle size and vehicle interfaces.
- Publisher
- Relativity Space
- Title
- Relativity Space Achieves Major Design and Production Milestones for Terran R, Demonstrating Momentum Towards Launch
- Accessed Date
- 2026-08-21
- Note
- Relativity's November 2025 company update reports a completed first second-stage Aeon V development test campaign and continued production of Aeon V development hardware.
- Publisher
- Relativity Space
- Title
- November 2025 Company Update