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Gross Mass: 179,200 kg (395,000 lb). Empty Mass: 20,400 kg (44,900 lb). Thrust (vac): 1,778.900 kN (399,913 lbf). Isp: 447 sec. Burn time: 385 sec. Propellants: Lox/LH2. Isp(sl): 200 sec. Diameter: 6.61 m (21.68 ft). Span: 6.61 m (21.68 ft). Length: 22.82 m (74.86 ft). Country: USA. No Engines: 1. Engine: Toroidal 400k. Status: Study 1967. S-IVB with 16.5 foot stretch, 350,000 pounds propellant, 1 400,000 pound thrust toroidal engine. Used on Launch Vehicles:
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