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SLS SRB 2720
Solid propellant rocket stage. Four such 180 inch segmented solid rocket motors provided first stage thrust for Project Lunex. A liquid propellant first stage was considered as an alternative, but the solid stage was the baseline. Empty mass, specific impulse estimated.

Status: Study 1961. Thrust: 8,130.00 kN (1,827,690 lbf). Gross mass: 366,716 kg (808,470 lb). Unfuelled mass: 56,000 kg (123,000 lb). Specific impulse: 260 s. Specific impulse sea level: 235 s. Burn time: 100 s. Height: 51.00 m (167.00 ft). Diameter: 4.57 m (14.99 ft). Span: 4.57 m (14.99 ft).

Country: USA. Launch Vehicles: SLS BC-2720, SLS AB-825. Propellants: Solid.
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