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Class: Tug. Nation: USA. Upper stage / space tug - study completed 1991. Late 1980's update of 1960's Nerva design. Late 1980's update of 1960's Nerva design. Unit Cost $: 200.000 million. Length: 47.60 m (156.10 ft). Basic Diameter: 10.00 m (32.00 ft). Span: 10.00 m (32.00 ft). Mass: 158,400 kg (349,200 lb). Main Engine: Nerva NTR. Main Engine: 8,500 kg (18,700 lb). Main Engine Thrust: 333.000 kN (74,861 lbf). Main Engine Propellants: Nuclear/LH2. Main Engine Propellants: 131,400 kg (289,600 lb). Main Engine Isp: 925 sec.
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