万花筒 2013-05-16&05-18 美X-51A破高超音速记录：6分钟冲刺5.1马赫
时间：2013-09-22 08:26:53
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（单词翻译）
This was the flight of the Boeing X51A Waverrider. The company and the US military says it’s made aviation history. The unmanned craft achieved the longest ever hypersonic flights by a jet fuelled-propelling.
It hurtled alone at 5 times the speed of sound for 3 and a half minutes. It covered 213
nautical1 miles in just over 6 minutes across the skies of California. The US Air Force says the craft was intended to demonstrate the new technology, not as a prototype for new weapons. It was the last 4 X51A craft built by Boeing. The end of the dramatic journey was a little less than glorious. It was crashed into the Pacific ocean in a controlled dive.
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