This page no longer updated from 31 October 2001. Latest version can be found at Helios A-2

Gross Mass: 153,000 kg. Empty Mass: 26,000 kg. Thrust (vac): 295,000 kgf. Isp: 830 sec. Burn time: 353 sec. Propellants: Nuclear/LH2 Diameter: 6.7 m. Span: 10.1 m. Length: 67.1 m. Country: USA. No Engines: 1. Nuclear 12 Gw Status: Study, Ehricke, 1960. Comments: Nuclear second stage .
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Last update 12 March 2001.
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© Mark Wade, 2001 .