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由英国牵头几家共同开发的霍托尔航天飞机,其部分组合件的先行试验工作已经在英国的罗耳斯·罗伊斯公司着手进行。先行试验工作是为期两年的霍托尔方案论证研究的一个组成部分。霍托尔航天飞机在大气层内使用喷气发动机飞行9分钟,以后则靠火箭发动机进行工作。
The joint pilot development of some of the Hultors from the United Kingdom led some of its pilot work already under way at the company’s Rolls-Royce plant in the United Kingdom. Pilot work is part of a two-year study of Hortor’s program feasibility studies. Hult Space Shuttle used a jet engine to fly for 9 minutes in the atmosphere, and later on a rocket engine.