Bell X-1

The Bell X-1, originally designated XS-1, was a joint NACA-U.S. Army Air Forces-U.S. Air Force supersonic research project built by the Bell Aircraft Company. Conceived in 1944 and designed and built during 1945, it reached nearly 1,000 m.p.h. (1,600 km/h) in 1948. A derivative of this same design, the Bell X-1A, having greater fuel capacity and hence longer rocket burning time, exceeded 1,600 m.p.h. (2,575 km/h) in 1954. The X-1 was the first airplane to exceed the speed of sound in level flight and was the first of the so-called X-planes, an American series of experimental rocket planes designated for testing of new technologies and often kept secret.

Read more about Bell X-1:  Design and Development, Operational History, Variants, Specification (Bell X-1), Specification (Bell X-1E)

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Specification (Bell X-1E)
... Data from The X-Planes X-1 to X-45 General characteristics Crew 1 Length 31 ft (9.4488 m) Wingspan 22 ft 10 in (6.9596 m) Height 10 ft 10 in (3.3 m ... "> Chuck Yeager broke the sound barrier on 14 October 1947 in the Bell X-1 ...

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    I was allowed to ring the bell for five minutes until everyone was in assembly. It was the beginning of power.
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