Proton KM-4 Briz M

Briz M

Credit - Khrunichev

Gross Mass: 22,170 kg (48,870 lb). Empty Mass: 2,370 kg (5,220 lb). Thrust (vac): 19.600 kN (4,406 lbf). Isp: 326 sec. Burn time: 3,000 sec. Propellants: N2O4/UDMH. Diameter: 2.50 m (8.20 ft). Span: 4.10 m (13.40 ft). Length: 2.61 m (8.56 ft). Country: Russia. No Engines: 1. Engine: S5.98M. Status: In production. First Flight: 1999. Last Flight: 2003. No Launched: 4. Other designations: Briz M.

New upper stage for Proton, replacing Energia Corporation's Block DM, making Proton an all-Khrunichev launch vehicle. The Khrunichev-built Briz-M upper stage is a derivative of the flight-proven Briz -K stage (as used on the Rokot booster). The Briz-M consists of a central cylinder and a jettisonable external propellant tank. Propellant carried is dependent on the specific mission requirements and is varied to maximize performance for the mission. The Briz-M is capable of operating, on-orbit, for a minimum of 24-hours and is controlled by a closed loop, triple redundant guidance system that is commandable in flight.

Used on Launch Vehicles:

Proton 8K82K / Briz-M.

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