An aircraft, for example, flying supersonic at 50,000 feet can produce a sonic boom cone about 50 miles wide.

例如，一架50,000英尺高处的超音速飞机可以制造出50英里左右宽的音爆圆锥。

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Sonic booms produced by aircraft flying supersonic at altitudes of less than 100 feet, creating between 20 and 144 pounds overpressure, have been experienced by humans without injury.

飞行在低于100英尺的超音速飞机制造的音爆，造成的20到144磅的超压，没有对人体造成伤害。

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Overpressures of 1 to 2 pounds are produced by supersonic aircraft flying at normal operating altitudes. Some public reaction could be expected between 1.5 and 2 pounds.

一到二磅的超压是由正常飞行高度的超音速飞机制造的。在1.5到2磅之间时可能会引起一些公众反应。

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The U.S. Air Force is currently test-flying an optionally piloted supersonic drone over the Gulf of Mexico based on a modified F-16 fighter jet.

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That is critical for flying over America, where supersonic flight is banned because of the noise pollution created by sonic booms.

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The four current NASA pilots who can operate the modified 747 are ex-military aviators who split their time flying other planes including zero-gravity aircraft and T-38 supersonic jets.

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