As with the NASA design, in order to achieve space flight the Buran needed an external source of thrust that would be jettisoned when no longer needed. Buran employed an Energia rocket supplemented by four smaller liquid-fuel Zenit booster rockets, unlike the Shuttle, which uses two solid-fuel booster rockets connected to a fuel tank. The Energia made a successful test-launch in May 1987, paving the way for an unmanned test-flight of Buran.
At 3am local time on 15th November 1988 orbiter OK-1.01 lifted off from the launch pad at Baikonur Cosmodrome. The space flight lasted 206 minutes, during which Buran orbited the Earth twice before making a successful automatic landing on a runway back at Baikonur despite of a powerful cross-wind. Nevertheless, the success of the test flight was not enough to save the project, which was mothballed due to lack of funds and the shifting political situation in the Soviet Union before President Bosis Yeltsin officially cancelled the project in 1993.
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