YJSP Elysium
YJSP Elysium is the Yellow Jacket Space Program’s experimental regeneratively cooled liquid rocket engine for its Vespula-class propulsion work. The team’s design combines a GRCop-42 converging-diverging nozzle with a conventionally manufactured copper combustion chamber, developed using its in-house design code. Its stated design objective is steady thermal operation at a mixture ratio of 2.0 without film cooling. Elysium is documented separately from the Prometheus ablative engine used on the April 2026 Vespula flight.
Identity
- Aliases
- ElysiumYellow Jacket Space Program Elysium
- Domains
- spaceflight
- Identity Level
- model
- Kind
- liquid-rocket-engine
- Name
- YJSP Elysium
- Status
- development
Details
- Description
- YJSP Elysium is the Yellow Jacket Space Program’s experimental regeneratively cooled liquid rocket engine for its Vespula-class propulsion work. The team’s design combines a GRCop-42 converging-diverging nozzle with a conventionally manufactured copper combustion chamber, developed using its in-house design code. Its stated design objective is steady thermal operation at a mixture ratio of 2.0 without film cooling. Elysium is documented separately from the Prometheus ablative engine used on the April 2026 Vespula flight.
Links
Assets & Meta
- Creation Time
- October 29, 2026 at 15:56:32 UTC
- Updated Time
- October 29, 2026 at 15:56:32 UTC
Other
- Sources
- Accessed Date
- 2026-10-29
- Note
- Named experimental engine, materials and thermal design goals; this source does not establish flight use.
- Published Date
- 2025-02-13
- Publisher
- Yellow Jacket Space Program
- Title
- Elysium | Vespula Regeneratively Cooled Engine
- Accessed Date
- 2026-10-29
- Note
- Distinguishes the engine actually used on Vespula’s April 2026 flight.
- Publisher
- Yellow Jacket Space Program
- Title
- KeroLOX program and Vespula flight