This page no longer updated from 31 October 2001. Latest version can be found at www.astronautix.com
Gross Mass: 748,000 kg.
Empty Mass: 27,000 kg. Isp: 453 sec. Burn time: 522 sec. Propellants: Lox/LH2 Isp(sl): 361 sec. Diameter: 8.4 m. Span: 8.7 m. Length: 47.0 m. Country: USA. No Engines: 0. None Status: Hardware. Other designations: Super Lightweight External Tank.
The Super Lightweight Tank used 2195 Aluminium-Lithium alloy as the main structural material in place of the 2219 aluminium alloy of the original design. This saved 3,500 kg in empty mass, increasing shuttle payload by the same amount. This change was made in anticipation of Shuttle-Mir and Shuttle-ISS flights to high inclination 51.6 degree orbits. The tank was first used on STS-91 in June 1998.
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Last update 12 March 2001.
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© Mark Wade, 2001 .