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Bell X-1
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The Bell X-1, originally designated XS-1, was the first aircraft to exceed the speed of sound in controlled, level flight. It was the first of the so-called X-planes, an American series of experimental aircraft designated for testing of new technologies and usually kept highly secret. http://en.wikipedia.org/wiki/Bell_X-1 this model is protected under a "Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 " license
http://creativecommons.org/licenses/by-nc-nd/3.0/
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