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X代表探求未知的试验,正是这些成果辉煌的X系列飞机,展示了美国空天探索活动的胆略和勇气。突破音障的X-1飞机以及高空高速飞行的X-15飞机时常在人们心目中闪现。X系列飞机实际上包容了研究机的很大一部分,包括空天飞机、核动力轰炸机、旋翼机、火箭、滑翔机、航天飞机,甚至还有一种私商制造的水上飞机。在50年中,美国X系列研究机不断将飞行极限往前扩展,下一个目标是太空。
X represents an unknown test. It is these brilliant X-series aircraft that demonstrate the audacity and courage of US space-day exploration activities. Breakthrough sound barrier X-1 aircraft and high-altitude high-speed flying X-15 aircraft often flashed in people’s minds. The X-Series aircraft actually cover a large part of the research aircraft, including space-day aircraft, nuclear-powered bombers, rotorcraft, rockets, gliders, space shuttles and even a privately owned seaplane. In 50 years, the United States X series of research continues to expand the limit of flight forward, the next goal is space.