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Helios A-2
Status: Study 1960. Thrust: 2,892.00 kN (650,147 lbf). Gross mass: 153,000 kg (337,000 lb). Unfuelled mass: 26,000 kg (57,000 lb). Specific impulse: 830 s. Burn time: 353 s. Height: 67.10 m (220.10 ft). Diameter: 6.70 m (21.90 ft). Span: 10.10 m (33.10 ft).
| Helios B-2 Nuclear/LH2 propellant rocket stage. Nuclear second stage. |
| Helios C-2 Nuclear/LH2 propellant rocket stage. Nuclear second stage. |
Country: USA. Engines: Nuclear 12 Gw. Launch Vehicles: Helios A. Propellants: Nuclear/LH2.
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