Notional LOx/LH2 rocket engine. Study 1960. Engines for booster stage with LOx tanks only to take nuclear second stage to stratosphere. Helios A, B, C studies.
Status: Study 1960. Thrust: 1,667.00 kN (374,756 lbf). Specific impulse: 400 s. Specific impulse sea level: 340 s. Burn time: 117 s.