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Soyuz 11A511U / Fregat
Part of R-7
Russian orbital launch vehicle. Standard Soyuz universal booster with the Fregat upper stage, derived from the propulsion system for Lavochkin interplanetary probes.

Status: Design 2000. Payload: 5,000 kg (11,000 lb). Thrust: 4,030.00 kN (905,980 lbf). Gross mass: 305,000 kg (672,000 lb). Height: 46.10 m (151.20 ft). Diameter: 2.95 m (9.67 ft). Apogee: 450 km (270 mi).

The Fregat upper stage has a flight-proved propulsion subsystem that is based on a single-chamber Lavochkin engine. Four clusters of three 50-N hydrazine thrusters provide attitude control. The Fregat propulsion system powered the Fobos probe to Mars, and the main engine was fitted on nearly 30 interplanetary spacecraft. During its numerous missions, the engine demonstrated the highest reliability under extreme conditions, exceeding technical specifications. This application of proven, in-production hardware ensures high reliability and lower cost for the Fregat upper stage. Fregat operates on UDMH fuel and N2O4 oxidizer, and has a liftoff mass of up to 6,535 kg. The weight at burnout is 950-1,100 kg.. Vacuum thrust is 19.6 kN., and burn time is up to 877 sec. The engine can be restarted as many as 20 times.

LEO Payload: 5,000 kg (11,000 lb) to a 450 km orbit at 51.80 degrees. Payload: 2,700 kg (5,900 lb) to a 800 km SSO. Launch Price $: 50.000 million in 1999 dollars.

Stage Data - Soyuz 11A511U / Fregat



Family: orbital launch vehicle. Country: Russia. Engines: S5.92. Stages: Fregat, Soyuz 11A511U-0, Soyuz 11A511U-1, Soyuz 11A511U-2. Agency: Korolev bureau.

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