UR-700 Credit - © Mark Wade

UR-700 with high energy upper stage consisting of 7 x RO-31 Nuclear A engines using LH2+Methane propellants with a total thrust of 280 tonnes. Usable third stage propellant 196 tonnes, payload increased to 230 to 250 tonnes

Manufacturer: Chelomei. LEO Payload: 270,000 kg (590,000 lb). to: 200 km Orbit. at: 51.00 degrees. Liftoff Thrust: 56,500.000 kN (12,701,700 lbf). Total Mass: 4,823,000 kg (10,632,000 lb). Core Diameter: 17.60 m (57.70 ft). Total Length: 76.00 m (249.00 ft).

• Yeteyev, Ivan, Operezhaya vremya, Ocherki, Moscow, 1999.. Collection of articles involving the life and works of Chief Designer Chelomei and the Khrunichev factory.