On Nov 8, 2008, at 19:42 , Rick Womer wrote:
Excellent, Walt.
In #9, why is the back 1/3 of the plane blurred? Water vapor on a
humid day?
A plane's wings passing through the air by it's airfoil nature
compresses that air, then allows it to decompress after it passes.
This sudden decompression forces any moisture out of the air, causing
those vapor clouds. As a plane approaches the speed of sound, that
cloud will work it's way towards the nose of the plane when the shock
wave the plane produces becomes almost a solid that, once passed,
again, is releasing the pressure of the compressed air mass and
forming a "cloud".
Search the web for jets sound barrier for images of the phenomenon.
Joseph McAllister
Pentaxian
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