Proton rocket 3rd stage

Length: 4.11m
Diameter: 4.1m
Engine(s): One RD-0213 and one Four-Nozzle Vernier
Thrust: 583 kN (131,000 lbf)
Inert Mass: 3,500 kg
Propellant: 46,562 kg

Guidance, navigation, and control of the
Proton M during operations of the first three
stages is carried out by a triple redundant closed-loop
digital avionics system mounted in the 3rd Stage



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