Fregat-MT upper stage
Fregat-MT is the upgraded, restartable Fregat integrated upper-stage propulsion system with additional propellant tanks for high-energy and multi-satellite missions. Current NPO Lavochkin specifications list 7,640 kg initial mass, 1,035 kg final mass, 1,945 mm height, 3,800 mm diameter, 6,550/6,650 kg propellant load, 2,030/1,420 kgf thrust modes, 333.2/320 s specific impulse, and up to seven main-engine starts. This record uses active for current product documentation and family support without asserting a current launch contract.
Identity
- Aliases
- Fregat-MTFregat MT
- Domains
- spaceflight
- Identity Level
- integrated-system
- Kind
- integrated-propulsion-system
- Name
- Fregat-MT upper stage
- Status
- active
Details
- Description
- Fregat-MT is the upgraded, restartable Fregat integrated upper-stage propulsion system with additional propellant tanks for high-energy and multi-satellite missions. Current NPO Lavochkin specifications list 7,640 kg initial mass, 1,035 kg final mass, 1,945 mm height, 3,800 mm diameter, 6,550/6,650 kg propellant load, 2,030/1,420 kgf thrust modes, 333.2/320 s specific impulse, and up to seven main-engine starts. This record uses active for current product documentation and family support without asserting a current launch contract.
- Developers
- Dry Mass Kg
- 1,035
- Length M
- 1.945
- Manufacturers
- Propellants
- unsymmetrical dimethylhydrazinenitrogen tetroxide
- Rocket Specs
- Restartable
- Yes
- Vacuum Specific Impulse S
- 333.2
- Vacuum Thrust Kn
- 19.908
Links
Assets & Meta
- Creation Time
- August 1, 2026 at 15:32:13 UTC
- Updated Time
- August 21, 2026 at 00:12:13 UTC
Other
- Diameter M
- 3.8
- Sources
- Accessed Date
- 2026-08-01
- Note
- ESA identifies the exact Soyuz ST-B/Fregat-MT combination, calls Fregat-MT an upgraded Fregat upper stage, and records its additional propellant load.
- Publisher
- European Space Agency
- Title
- Galileo's Soyuz launchers arrive at French Guiana
- Accessed Date
- 2026-08-01
- Note
- ESA documents NPO Lavotchkin as Fregat designer/manufacturer and describes the Fregat storable-propellant reignitable upper stage above the three Soyuz stages.
- Publisher
- European Space Agency
- Title
- Soyuz
- Accessed Date
- 2026-08-01
- Note
- ESA describes Soyuz-Fregat as a four-stage launch vehicle with an autonomous, restartable Fregat upper stage using storable propellants.
- Publisher
- European Space Agency
- Title
- Soyuz-Fregat launch vehicle
- Accessed Date
- 2026-08-20
- Note
- Current NPO Lavochkin product page gives exact Fregat-MT specifications: 7,640 kg initial mass, 1,035 kg final mass, 1,945 mm height, 3,800 mm diameter, 6,550/6,650 kg propellant load, 2,030/1,420 kgf thrust modes, 333.2/320 s specific impulse, and up to seven main-engine starts.
- Publisher
- NPO Lavochkin
- Title
- Universal Upper Stage Fregat