This page no longer updated from 31 October 2001.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

Gross Mass: 1,578 kg. Empty Mass: 275 kg. Thrust (vac): 100 kgf. Isp: 312 sec. Burn time: 60 sec. Propellants: N2O4/MMH Isp(sl): 0 sec. Diameter: 2.9 m. Span: 2.9 m. Length: 0.7 m. Country: USA. No Engines: 2. R-4D Status: Hardware. Other designations: Integrated Apogee Boost Subsystem.
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Last update 12 March 2001.
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© Mark Wade, 2001 .