Gross Mass: 600,788 kg.
Empty Mass: 59,844 kg. Thrust (vac): 714,156 kgf. Isp: 451 sec. Burn time: 324 sec. Propellants: Lox/LH2Isp(sl): 280 sec. Diameter: 10.1 m. Span: 10.1 m. Length: 29.6 m. Country: USA. No Engines: 5. HG-3Status: Study NASA 1966. Comments: Basic Saturn II with 187 inch stretch of propellant tanks and high chamber pressure SSME-type engines with 65% increase in thrust and 26 second improvement in specific impulse.