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美国NASA和空军的几家研究试验机构正在着手对几种火箭发动机进行关键性的试验.这些试验将加快NASA的X-33和X-34有翼试验火箭及波音公司的“德尔它”4渐进一次性运载火箭(EELV)将要使用的三种先进低成本推进系统的研制.这也是2O多年中美国首次研制新的大型火箭推进系统.7O年代末,美国研制了航天飞机主发动机(SSME),此后再没有实施过大型火箭发动机研制计划.新发动机研制试验计划将使NASA马歇尔航天飞行中心、斯坦尼斯航天中心和空军研究实验室推进部的推进技术研究试验再度活跃.
NASA’s X-33 and X-34 wing-test rockets and Boeing’s “Deltas” 4-step advancement are being accelerated by several key NASA and Air Force research laboratories that are conducting crucial tests on several rocket motors The development of three advanced and low-cost propulsion systems to be used by the EELV was the first such large-scale rocket propulsion system developed by the United States in 20 years. In the late 1970s, the United States developed the Space Shuttle Master Engine (SSME) Since then no major rocket engine development plans have been implemented and the new engine development pilot program will revitalize NASA’s Marshall Space Flight Center, the Stennis Space Center and the Air Force Research Laboratory’s Advanced Technology Research Trials.