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Manufacturer Name: Orbus 21. Designer: CSD. Used on stages: IUS-1 , TOS. Used on launch vehicles: Athena-1, Athena-2, Athena-3, Titan 34D. Gross Mass: 10,841 kg. Empty Mass: 1,134 kg. Propellants: Solid Thrust(vac): 18,508 kgf. Thrust(vac): 181.50 kN. Isp: 296 sec. Isp (sea level): 115 sec. Burn time: 152 sec. Diameter: 2.3 m. Length: 3.1 m. Chambers: 1. Chamber Pressure: 58.00 bar. Area Ratio: 64.00. Country: USA. Status: In Production. First Flight: 1982. Last Flight: 1999. Flown: 43. Comments: Used in TOS; IUS-1 on Shuttle, Titan 34D. Known by manufacturer as Orbus 21. Propellant: 86% solids made up of HTPB UTP-19360A. Shape: cylindrical.
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Last update 12 March 2001.
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