Status: Cancelled 1960. Thrust: 313.00 kN (70,365 lbf). Gross mass: 210,000 kg (460,000 lb). Height: 59.20 m (194.20 ft). Diameter: 8.25 m (27.06 ft). Span: 35.10 m (115.10 ft). Apogee: 17 km (10 mi).
The M-51 was an unpiloted version of the M-50 manned bomber. The drone would have delivered multiple warheads on targets in the continental United States. Cruise speed was subsonic, 800 km/hr, with 1950 km/hr supersonic dash speeds over the target areas. The enormous bomber had a wing area of 290.6 square meters.
Maximum range: 7,400 km (4,500 mi). Boost Propulsion:RD-7M Turbojet. Maximum speed: 1,950 kph (1,210 mph).