This page no longer updated from 31 October 2001. Latest version can be found at Hyperion Sustainer

Gross Mass: 453,592 kg. Empty Mass: 110,000 kg. Thrust (vac): 589,670 kgf. Isp: 800 sec. Burn time: 460 sec. Propellants: Nuclear/LH2 Diameter: 8.5 m. Span: 8.5 m. Length: 51.0 m. No Engines: 2. Nerva 12 GW Status: Study.
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Last update 12 March 2001.
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© Mark Wade, 2001 .