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近期的研究表明,轨道科学公司空射型飞马座火箭改用吸气式发动机从技术上说是可行的,并可在4～5年之内投入使用。这种型号的火箭比现在的飞马座轻40％以上。美国空军的莱特实验室对采用吸气式发动机来降低飞马座的总重进行了研究,并探讨了使用空气涡轮火箭发动机和超音速燃烧冲压喷气发动机的可能
Recent studies show that orbiting science company air jet Pegasus to air-breathing engine is technically feasible and can be put into use within 4 to 5 years. This model rocket lighter than the current Pegasus more than 40%. The Air Force Wright Laboratory has studied the use of aspirated engines to reduce the total weight of Pegasus and explored the possibility of using an air turbine rocket engine and supersonic combustion ramjet engine