AKA: Nerva 2/NTR. Status: Study 1991. Thrust: 333.00 kN (74,861 lbf). Gross mass: 158,400 kg (349,200 lb). Unfuelled mass: 27,000 kg (59,000 lb). Specific impulse: 925 s. Burn time: 3,575 s. Height: 47.60 m (156.10 ft). Diameter: 10.00 m (32.00 ft). Span: 10.00 m (32.00 ft).
Cost $ : 200.000 million.