对爆燃的主要特征之一，是火焰的速度大大低于音速的降低旅行。

One of the primary attributes of deflagration is that the flame travels at a speed significantly lower than the speed of sound.

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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。

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.

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还有就是要求所有设计的飞行器的速度必须不低于85%音速水平；航程必须达到7000英里；在负载量上无论乘客还是货物必须达到50,000到100；000磅。

And each design has to fly up to 85 percent of the speed of sound; cover a range of approximately 7, 000 miles; and carry between 50, 000 and 100, 000 pounds of payload, either passengers or cargo.

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