KM-V2c
JAXA's KM-V2c is the exact Enhanced Epsilon third-stage solid motor, partially modified from the M-V KM-V2. The current Epsilon User's Manual lists 2.3 m length, 1.4 m diameter, 3.3 t stage weight, 2.5 t propellant, 99.8 kN thrust, 90 s burn time, and 301 s specific impulse. This record uses active for current JAXA documentation of the Enhanced Epsilon configuration and keeps KM-V2c distinct from the M-V KM-V2 and the successor Epsilon S third-stage design.
Identity
- Aliases
- KM-V2cEpsilon KM-V2c
- Domains
- spaceflight
- Identity Level
- model
- Kind
- solid-rocket-motor
- Name
- KM-V2c
- Status
- active
Details
- Description
- JAXA's KM-V2c is the exact Enhanced Epsilon third-stage solid motor, partially modified from the M-V KM-V2. The current Epsilon User's Manual lists 2.3 m length, 1.4 m diameter, 3.3 t stage weight, 2.5 t propellant, 99.8 kN thrust, 90 s burn time, and 301 s specific impulse. This record uses active for current JAXA documentation of the Enhanced Epsilon configuration and keeps KM-V2c distinct from the M-V KM-V2 and the successor Epsilon S third-stage design.
- Length M
- 2.3
- Propellants
- solid HTPB composite
- Rocket Specs
- Burn Time S
- 90
- Vacuum Specific Impulse S
- 301
- Vacuum Thrust Kn
- 99.8
Links
Assets & Meta
- Creation Time
- August 1, 2026 at 16:32:33 UTC
- Updated Time
- August 21, 2026 at 00:21:11 UTC
Other
- Diameter M
- 1.4
- Sources
- Accessed Date
- 2026-08-01
- Note
- JAXA identifies KM-V2c as the exact Epsilon third-stage motor, describes its partial modification from KM-V2, and lists its solid HTPB propellant.
- Publisher
- Japan Aerospace Exploration Agency
- Title
- Epsilon User's Manual
- Accessed Date
- 2026-08-01
- Note
- JAXA documents the Epsilon third-stage inheritance from M-V propulsion technology while preserving the exact KM-V2c boundary.
- Publisher
- Japan Aerospace Exploration Agency
- Title
- Epsilon Technology: A Link to the Future
- Accessed Date
- 2026-08-20
- Note
- JAXA's current Epsilon User's Manual identifies KM-V2c as the third stage of Enhanced Epsilon and lists 2.3 m length, 1.4 m diameter, 3.3 t stage weight, 2.5 t propellant, 99.8 kN thrust, 90 s burn time, and 301 s specific impulse.
- Publisher
- Japan Aerospace Exploration Agency
- Title
- Epsilon User's Manual
- Accessed Date
- 2026-08-20
- Note
- JAXA's Space Transportation Technology Directorate documents the Enhanced Epsilon propulsion architecture and distinguishes its inherited second- and third-stage technology from the successor Epsilon S configuration.
- Publisher
- Japan Aerospace Exploration Agency Space Transportation Technology Directorate
- Title
- Epsilon