This page no longer updated from 31 October 2001. Latest version can be found at TOS

Gross Mass: 10,960 kg. Empty Mass: 1,130 kg. Thrust (vac): 18,875 kgf. Isp: 296 sec. Burn time: 144 sec. Propellants: Solid Isp(sl): 115 sec. Diameter: 2.3 m. Span: 2.3 m. Length: 3.3 m. Country: USA. No Engines: 1. SRM-1 Status: Hardware. Other designations: Transfer Orbit Stage. Comments: IUS-2 stage with simplified electronics.
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Last update 12 March 2001.
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© Mark Wade, 2001 .