Gross Mass: 680,000 kg.
Empty Mass: 54,000 kg. Thrust (vac): 1,088,000 kgf. Isp: 428 sec. Burn time: 242 sec. Propellants: Lox/LH2Isp(sl): 310 sec. Diameter: 11.6 m. Span: 11.6 m. Length: 35.1 m. Country: USA. No Engines: 2. M-1Status: Study NASA June 1960. Comments: Mass estimated based on total LV weight. J-2-powered version of this stage also proposed. .