Gross Mass: 8,474,000 kg.
Empty Mass: 1,188,000 kg. Thrust (vac): 14,331,000 kgf. Isp: 620 sec. Burn time: 310 sec. Propellants: Air/Lox/LH2Isp(sl): 620 sec. Diameter: 21.3 m. Span: 43.7 m. Length: 49.1 m. Country: USA. No Engines: 40. CD ModuleStatus: Study 1963. Comments: Operational date would have been October 1980. Expendable stage. Air-augmented plug nozzle. .