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Model: Helios A-2. Gross Mass: 153,000 kg (337,000 lb). Empty Mass: 26,000 kg (57,000 lb). Thrust (vac): 2,892.000 kN (650,147 lbf). Isp: 830 sec. Burn time: 353 sec. Propellants: Nuclear/LH2. Diameter: 6.70 m (21.90 ft). Span: 10.10 m (33.10 ft). Length: 67.10 m (220.10 ft). Country: USA. No Engines: 1. Motor: Nuclear 12 Gw. Status: Study 1960. Nuclear second stage
Model: Helios B-2. Gross Mass: 177,000 kg (390,000 lb). Empty Mass: 29,000 kg (63,000 lb). Thrust (vac): 3,330.000 kN (748,610 lbf). Isp: 830 sec. Burn time: 355 sec. Propellants: Nuclear/LH2. Diameter: 6.70 m (21.90 ft). Span: 10.10 m (33.10 ft). Length: 77.70 m (254.90 ft). Country: USA. No Engines: 1. Motor: Nuclear 14 Gw. Status: Study 1960. Nuclear second stage
Model: Helios C-2. Gross Mass: 309,000 kg (681,000 lb). Empty Mass: 54,000 kg (119,000 lb). Thrust (vac): 5,780.000 kN (1,299,390 lbf). Isp: 830 sec. Burn time: 355 sec. Propellants: Nuclear/LH2. Diameter: 8.50 m (27.80 ft). Span: 12.20 m (40.00 ft). Length: 85.40 m (280.10 ft). Country: USA. No Engines: 2. Motor: Nuclear 12 Gw. Status: Study 1960. Nuclear second stage
Used on Launch Vehicles:
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