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 "Soyuz-U Fregat" Space booster.
(Western designation SL-4).
The booster is a version of standard "Soyuz-U" booster with new upper stage "Fregat". "Fregat" upper stage was designed at Science Production Union of Lavochkin in Khimki city. It was design especially for Join Stock Company "Starsem" for launching "Cluster" satellites.
First flight was conducted February 8th, 2000. Until August 9th, 2000, there were four launches and no accidents.
Specification.
Launch weight....................................................306,000 kg
Thrust................................................................411,000 kg
Length........................................................................45 m
Diameter of cluster....................................................10,3 m
Payload weight
Low Earth Orbit..................................................... 7,050 kg
Propellant
Three stages...................................................kerosene+O2
upper stage........................................................UDMH+NO
Stage 1........................................................ engine RD-117
Stage 2........................................................ engine RD-118
Stage 3........................................................ engine RD-110
Upper stage.................................................... engine C5.92
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