NASA Morpheus HD4-A
HD4-A was the baseline Morpheus HD4 main engine used on the 1.5A Alpha vehicle in the 2012 free-flight campaign. NASA lists 4,200 lbf thrust, approximately 18.68 kN. After Alpha’s loss, its surviving injector was reused with a larger-throat chamber to create the later HD4-A-LT configuration.
Identity
- Aliases
- HD4-AMorpheus HD4 baseline
- Domains
- spaceflight
- Identity Level
- variant
- Kind
- liquid-rocket-engine
- Name
- NASA Morpheus HD4-A
- Status
- historical
Details
- Description
- HD4-A was the baseline Morpheus HD4 main engine used on the 1.5A Alpha vehicle in the 2012 free-flight campaign. NASA lists 4,200 lbf thrust, approximately 18.68 kN. After Alpha’s loss, its surviving injector was reused with a larger-throat chamber to create the later HD4-A-LT configuration.
- Developers
- Family
- Manufacturers
- Propellants
- liquid oxygenliquid methane
- Rocket Specs
- Sea Level Thrust
- …
Links
Assets & Meta
- Creation Time
- October 29, 2026 at 15:35:59 UTC
- Updated Time
- October 29, 2026 at 15:35:59 UTC
Other
- Sources
- Accessed Date
- 2026-10-29
- Note
- Engine configuration history and Table 1 distinguish HD4-A, HD4-A-LT, HD4-B-LT and ground-tested HD5.
- Publisher
- NASA Technical Reports Server
- Title
- Combustion Stability Characteristics of the Project Morpheus Liquid Oxygen / Liquid Methane Main Engine