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在M—X 批准阶段(Validation phace),研制的重点为推进装置、制导设备、再人体,以及机动发射。推进装置方面,将研究采用高能推进剂,以及重量小、推力偏角大,扩散段可延伸的喷管,比重小的壳体材料。为了利用先进的推进技术,计划研制和试验一些先进的末级发动机初样机(Preprototype),它采用改进的推进剂和先进的壳体结构。这种发动机有四发要在阿诺德工程发展中心进行高空模拟静态点火试验,第五发将在模拟的活动条件下进行振动和冲击试验。第三级研制计划中,将生产和试验具有早期推力终止能
At the M-X Validation Phace, development focused on propulsion, guidance equipment, re-body, and maneuvering. Propulsion device, will study the use of high-energy propellants, as well as small weight, thrust declination, the extension of the extension of the nozzle, a small proportion of the shell material. In order to take advantage of advanced propulsion technologies, it is planned to develop and test some of the state-of-the-art Preprototype engines with improved propellants and advanced shell structures. The engine has four rounds to be carried out at Arnold Engineering Development Center for simulated high-altitude static ignition test, the fifth will be under simulated conditions of activity vibration and impact tests. The third level of development plan, the production and testing with early thrust termination can