Gross Mass: 3,401,000 kg.
Empty Mass: 295,000 kg. Thrust (vac): 3,401,000 kgf. Isp: 428 sec. Burn time: 385 sec. Propellants: Lox/LH2Diameter: 18.3 m. Span: 18.3 m. Length: 28.8 m. Country: USA. No Engines: 5. M-1Status: Study 1963. Comments: Operational date would have been April 1973 .