S139 solid rocket motor
ISRO S139 operational HTPB solid core motor for PSLV and GSLV. ISRO identifies the GSLV Mk II first-stage core as a 138-tonne S139 motor with up to 4,800 kN thrust and 100 s burn; exact vehicle configurations preserve its PSLV/GSLV installation boundaries.
Identity
- Aliases
- S139
- Domains
- spaceflight
- Identity Level
- model
- Kind
- solid-rocket-motor
- Name
- S139 solid rocket motor
- Status
- active
Details
- Description
- ISRO S139 operational HTPB solid core motor for PSLV and GSLV. ISRO identifies the GSLV Mk II first-stage core as a 138-tonne S139 motor with up to 4,800 kN thrust and 100 s burn; exact vehicle configurations preserve its PSLV/GSLV installation boundaries.
- Developers
- Family
- Manufacturers
- Propellants
- HTPB solid propellant
- Rocket Specs
- Burn Time S
- 100
Links
- Official Url
- https://www.isro.gov.in/ISRO_EN/PSLV_CON.html
Assets & Meta
- Creation Time
- July 29, 2026 at 08:58:56 UTC
- Updated Time
- August 14, 2026 at 22:59:48 UTC
Other
- Sources
- Accessed Date
- 2026-07-29
- Note
- Supports the legacy vehicle installation and the narrow canonical identity used for migration.
- Publisher
- Official vehicle or program source
- Title
- Geosynchronous Satellite Launch Vehicle Mk II official vehicle reference
- Accessed Date
- 2026-07-29
- Note
- Supports the legacy vehicle installation and the narrow canonical identity used for migration.
- Publisher
- Official vehicle or program source
- Title
- Polar Satellite Launch Vehicle QL official vehicle reference
- Accessed Date
- 2026-07-29
- Note
- Supports the legacy vehicle installation and the narrow canonical identity used for migration.
- Publisher
- Official vehicle or program source
- Title
- Polar Satellite Launch Vehicle G official vehicle reference