The UR-500, originally designed as a two-stage intercontinental ballistic missile (ICBM), proved too giant to be a practical missile and was eventually reused as a capable satellite launcher with a third stage more. The two-stage edition of the UR-500 flew 4 times in 1965 and 1966, with physics-study satellites serving as payloads.
The moment level is powered by 3 RD-0120 engines and a single RD-0211 engine, capable of delivering a thrust of approximately 2,399 kN (539,000 lbf) in flight. These motors, also fed through nitroane and asymmetric dimethylhydrazine, burn up to 3 minutes and 27 minutes before cutting and separating the floors.
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– (@roscosmos) 21 July 2020
Due to the need for more controls on certain parts of the Proton-M vehicle, the launch was postponed for Friday, July 31 at 12:25 p.m. Moscow time (Thursday, July 30 at 9:25 p.m. UTC).
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