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Model: Nerva. Gross Mass: 178,321 kg (393,130 lb). Empty Mass: 34,019 kg (74,999 lb). Thrust (vac): 867.407 kN (195,001 lbf). Isp: 825 sec. Burn time: 1,200 sec. Propellants: Nuclear/LH2. Isp(sl): 380 sec. Diameter: 10.55 m (34.61 ft). Span: 10.55 m (34.61 ft). Length: 43.69 m (143.33 ft). Country: USA. No Engines: 1. Motor: Nerva 2. Status: Development 1971. Cost $ : 226.200 million. First Flight: 1980. Other designations: Nerva; Rover; Pluto.

Model: Saturn S-N V-25(S)U. Gross Mass: 245,760 kg (541,800 lb). Empty Mass: 71,190 kg (156,940 lb). Thrust (vac): 889.325 kN (199,928 lbf). Isp: 825 sec. Burn time: 1,500 sec. Propellants: Nuclear/LH2. Diameter: 10.06 m (33.00 ft). Span: 10.06 m (33.00 ft). Length: 48.17 m (158.03 ft). Country: USA. No Engines: 1. Motor: Nerva. Status: Study 1968.

Version of Nerva studied by Boeing for manned Mars expedition.

Model: Nerva 2/NTR. Gross Mass: 158,400 kg (349,200 lb). Empty Mass: 27,000 kg (59,000 lb). Thrust (vac): 333.000 kN (74,861 lbf). Isp: 925 sec. Burn time: 3,575 sec. Propellants: Nuclear/LH2. Diameter: 10.00 m (32.00 ft). Span: 10.00 m (32.00 ft). Length: 47.60 m (156.10 ft). Country: USA. No Engines: 1. Motor: Nerva NTR. Status: Study 1991. Cost $ : 200.000 million. First Flight: 2005.

Design as revised in detail in 2005.

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