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普惠公司已对国家空天飞机（NASP） 的一个全尺寸超音速燃烧冲压喷气发动机（scramjet）系统在M6的条件下进行了试验。试验的具体部位是发动机燃烧室和内部喷管。已经进行的5次试验所采集的数据与早先通过计算流体力学分析得出的scramjet工作特性相符。这些数据证实这种推进系统将能满足NASP计划的要求。 按计划,至少还要进行3次M6试验,以便为验证该系统从冲压喷气发动机（ramjet）工作方式过渡到约 M6以上的 scramjet工作方式的试验铺平道路。 该公司说,他们还将进行高达M8的试验,以评估整个系统及其各个部件的性能。
Pratt & Whitney has tested a full-size, scramjet system at the National Space Shuttle (NASP) under M6 conditions. Specific parts of the test is the engine combustion chamber and the internal nozzle. The data collected from the five experiments that have taken place are consistent with the scramjet operating characteristics previously obtained by computational fluid dynamics analysis. These data confirm that this propulsion system will meet the NASP program requirements. At least three more M6 tests are scheduled to pave the way for testing the system’s scramjet mode of operation that transitions from ramjet operation to above M6. The company said they will also conduct tests up to M8 to evaluate the performance of the entire system and its various components.