Universal Upper Stage “Fregat”
Glavkosmos
The Fregat Universal Upper Stage is designed to serve as the third stage of launch vehicles, enabling the placement of various satellites into different orbits. It has a flight-qualified heritage with multiple variants.
Key figurescomparable across the catalogue
- Mass
- 6,235 kg
- Largest dimension
- 3,875 mm
Normalised to common units so this product can be compared with others in its category. The supplier's own wording is below.
As published by the supplier
- Purpose
- Design and manufacture of upper stage for use as the 3rd stage of the launch vehicle and launch vehicles loading into various satellites orbits.
- Flight qualification of the product
- Yes
- Brief history of flight qualification
- Upper stage "Fregat", upper stage "Fregat-MT", upper stage "Fregat - SB".
- Possibility to adapt the product to customer requirements
- Yes
- Initial mass with maximum dressing
- 6235/7640/11680 kg
- Final weight
- 945/1035/1080 kg
- Dimensions: height / diameter mm
- 1875/3440 1945/3800 2435/3875 mm
- Fuel components: oxidizer / fuel
- AT / UDMH
- Maximum working fuel reserve / full refueling
- 5235/5307 6550/6650 10140/10330 kg
- Mdu thrust: bt / mt mode, kgf
- 2030±100/1420±150 2030±100/1420±150 2030±100/1420±150
- Specific impulse: bt / mt mode
- 333.2/320 s
- Maximum numbermd inclusions
- 7
About
The Universal Upper Stage “Fregat” is an advanced upper stage designed for integration as the third stage of launch vehicles. Its primary purpose is to inject satellites into a wide range of orbits. The Fregat upper stage boasts significant flight qualification, with a history that includes the original “Fregat”, “Fregat-MT”, and “Fregat-SB” variants. The design allows for adaptation to specific customer requirements. The use of additional fuel tanks and a droppable block of tanks in the “Fregat-MT” and “Fregat-SB” versions has substantially increased refueling mass, thereby enhancing the overall efficiency of the upper stage. It utilizes AT (nitrogen tetroxide) as an oxidizer and UDMH (unsymmetrical dimethylhydrazine) as fuel. The main propulsion system (MDU) offers two modes, BT and MT, with specified thrust and specific impulse values. The MDU is capable of up to 7 inclusions (restarts) during a mission.
Documentation
Need the full ICD, test reports or a specific revision? Ask the supplier directly.