Intercontinental cruise missile based on M-50 manned bomber. Subsonic cruise with Mach 2 dash into the target area.

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.

Manufacturer: Myasishchev. Liftoff Thrust: 313.000 kN (70,365 lbf). Total Mass: 210,000 kg (460,000 lb). Core Diameter: 8.25 m (27.06 ft). Total Length: 59.20 m (194.20 ft). Span: 35.10 m (115.10 ft). Maximum range: 7,400 km (4,500 mi). Boost Propulsion: Turbojet. Boost engine: 2 x RD-7M. Maximum speed: 1,950 kph (1,210 mph). Ceiling: 16,500 m (54,100 ft).