Credit: RKK Energia. 18,802 bytes. 149 x 425 pixels.
Gross Mass: 77,900 kg.
Empty Mass: 11,500 kg. Thrust (vac): 15,080 kgf. Isp: 441 sec. Burn time: 1,910 sec. Propellants: Lox/LH2Diameter: 5.2 m. Span: 5.2 m. Length: 16.5 m. Country: Russia. No Engines: 2. RD-56MStatus: Testing 1974. Comments: Upper stage developed 1971-1974 to support manned lunar expedition. Replaced Blok R/Blok S previously under development. Capable of five restarts and 11 days of flight. Could insert 24 tonnes into lunar orbit or 20 tonnes into geosynch orbit. .