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2003年12月2日,几乎就在莱特兄弟成功实现动力飞行后的100年,波音公司研制的X-50A“蜻蜓”无人驾驶技术验证机在美国亚利桑那州的陆军试验场完成了首次悬停飞行。目前,这种无人驾驶飞机正在逐步突破原有的飞行理念,实现技术上的一次全新飞跃,以满足美国军方对未来作战的需要。作为一种结台了直升机悬停能力和固定翼飞机高亚音速巡航能力的新型飞行器,X-50A验证机从提出概念、初步设计、系统验证到飞行试验,已经历了10多年的研制和发展历
On December 2, 2003, almost 100 years after the Wright brothers successfully achieved power flight, the X-50A “Dragonfly” unmanned validation machine developed by Boeing completed its first hovering at Army Field in Arizona, USA flight. At present, this drones are gradually breaking the original flight concept, to achieve a new technological leap in order to meet the needs of the U.S. military for future operations. As a new type of aircraft that combines the hovering ability of helicopters with the high subsonic cruise capability of fixed-wing aircraft, the X-50A has undergone more than 10 years of research and development from the concept, preliminary design, system verification and flight test. calendar