Engine Model: RSRM. Gross Mass: 590,000 kg (1,300,000 lb). Empty Mass: 88,000 kg (194,000 lb). Propellants: Solid. Thrust(vac): 11,519.999 kN (2,589,799 lbf). Isp: 267 sec. Isp (sea level): 235 sec. Burn time: 123 sec. Diameter: 3.77 m (12.36 ft). Length: 45.46 m (149.14 ft). Chambers: 1. Country: USA. Status: Study 1996. After the Challenger disaster the redesigned solid rocket motors had a slight reduction in performance due to reliability improvements.
RSRM used on Rocket Stages