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Engine Model: Press Fed. Propellants: N2O4/MMH. Thrust(vac): 17.800 kN (4,002 lbf). Isp: 300 sec. Mass Engine: 41 kg (90 lb). Diameter: 0.67 m (2.19 ft). Chambers: 1. Area Ratio: 98.00. Thrust to Weight Ratio: 44.34. Country: USA. Status: Design concept 1960's.

1960's designs for 'big dumb booster'..

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