Found this image at Wikipedia
"The origin of the cloud is debated; the leading theory claims: "a drop in air pressure at the plane described by the Prandtl-Glauert Singularity occurs so that moist air condenses there to form water droplets- Wikipedia
Speed of sound 660 Miles per hour
First self propelled vehicle to break sound barrier : German V-2 ballistic missile, 1942
1 comment:
That is very cool!
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