ボール・ウォッチのインスタグラム(ballwatch) - 10月15日 15時16分

ACCURACY UNDER ADVERSE CONDITIONS
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On this day in 1947, the X-1-1, piloted by Air Force Captain Charles "Chuck" Yeager, became the first aircraft to exceed the speed of sound, reaching about 700 miles per hour (Mach 1.06) and an altitude of 43,000 feet. Photo courtesy of NASA.
You can see the museum's Bell X-1B which is a similar aircraft located in the R&D Gallery. 1.usa.gov/1JCEWmc

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