Model: YaKhR-2.

YaKhR-2 Credit - © Mark Wade

Nuclear orbital launch vehicle. Other Family: Cancelled. Country: Russia. Status: Cancelled 1949.

First large space launcher considered in the Soviet Union. It would have had the same layout as the R-7, but with six strap-ons increased in size by 50%. The core, igniting at altitude, used a nuclear thermal engine using ammonia as propellant. Dropped in favor of development of conventional chemical propulsion.

Manufacturer: Korolev. LEO Payload: 40,000 kg (88,000 lb). to: 185 km Orbit. Liftoff Thrust: 12,422.800 kN (2,792,757 lbf). Total Mass: 888,000 kg (1,957,000 lb). Core Diameter: 3.33 m (10.92 ft). Total Length: 44.00 m (144.00 ft).

• Stage0: 6 x YaKhR-2 Strap-on. Gross Mass: 110,000 kg (240,000 lb). Empty Mass: 8,250 kg (18,180 lb). Motor: 6 x RD-111. Thrust (vac): 2,393.724 kN (538,131 lbf). Isp: 311 sec. Burn time: 125 sec. Length: 27.00 m (88.00 ft). Diameter: 3.33 m (10.92 ft). Propellants: Lox/Kerosene.

• Stage1: 1 x YaKhR-2 Core. Gross Mass: 180,000 kg (390,000 lb). Empty Mass: 22,000 kg (48,000 lb). Motor: 1 x YaRD OKB-456. Thrust (vac): 1,660.000 kN (373,180 lbf). Isp: 470 sec. Burn time: 430 sec. Length: 37.00 m (121.00 ft). Diameter: 3.33 m (10.92 ft). Propellants: Nuclear/Ammonia.

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