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Model: IUS-1. Gross Mass: 10,841 kg (23,900 lb). Empty Mass: 1,134 kg (2,500 lb). Thrust (vac): 181.501 kN (40,803 lbf). Isp: 296 sec. Burn time: 152 sec. Propellants: Solid. Isp(sl): 220 sec. Diameter: 2.34 m (7.67 ft). Span: 2.34 m (7.67 ft). Length: 3.52 m (11.54 ft). Country: USA. No Engines: 1. Motor: SRM-1. Status: Retired 1996. Cost $ : 40.000 million. First Flight: 1990. Last Flight: 1996. No Launched: 11. Other designations: Orbus 21D.
Model: TOS. Gross Mass: 10,960 kg (24,160 lb). Empty Mass: 1,130 kg (2,490 lb). Thrust (vac): 185.100 kN (41,612 lbf). Isp: 296 sec. Burn time: 144 sec. Propellants: Solid. Isp(sl): 115 sec. Diameter: 2.34 m (7.67 ft). Span: 2.34 m (7.67 ft). Length: 3.29 m (10.79 ft). Country: USA. No Engines: 1. Motor: SRM-1. Status: Retired 2004. First Flight: 1982. Last Flight: 2004. No Launched: 10. Other designations: Transfer Orbit Stage. IUS-2 stage with simplified electronics. Model: ESBM. Gross Mass: 10,810 kg (23,830 lb). Empty Mass: 1,030 kg (2,270 lb). Thrust (vac): 189.200 kN (42,534 lbf). Isp: 293 sec. Burn time: 150 sec. Propellants: Solid. Diameter: 2.30 m (7.50 ft). Span: 2.30 m (7.50 ft). Length: 3.00 m (9.80 ft). Country: USA. No Engines: 1. Motor: SRM-1. Status: Out of production. First Flight: 1995. Last Flight: 2001. No Launched: 10. No Failed: 1.
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