美国空军研究实验室（AFRL）已继续使用新的高音火箭根据New Atlas。与一代合作轨道发射服务ices, the rocket, dubbed the X-60A vehicle, passed its Critical Design Review. Now, X-60A, an air-dropped liquid rocket specifically designed for hypersonic flight research, is said to come to fruition in 2020.
创建一架飞机以5马赫（3,806 mph）的速度飞行的飞机面临许多挑战。这包括与技术障碍有关的飞涨成本。为了减轻升级的成本，美国联邦航空管理局许可的Cecil Spaceport和空军小型企业创新研究计划一直在考虑将航班迁移到美国传统的美国国防部航班测试范围之外。
AFRL对X-60A计划的推理是增加飞行测试的频率，同时还降低了相关飞行条件下高超音速技术的成本。尽管高超音速地面测试设施在技术开发中是不可或缺的，但要测试具有实际高超音速飞行条件的技术也至关重要。
This is the first Air Force Small Business Innovative Research program to receive an experimental “X” designation, in a line of historical X-planes that includes the X-15 and X-51A.
The X-60A rocket vehicle propulsion system is a Hadley liquid rocket engine. The aircraft utilizes liquid oxygen and kerosene propellants, and can be dropped from an aircraft that’s the size of a business jet. The liquid fuel makes the X-60A more flexible and has better performance over solid rocket boosters, General Orbit says.
该系统旨在为高于5马赫的高动态压力飞行条件提供更便宜和更容易获得的手段。
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