Quote:
Originally posted by DialerNET
That's a good point, but I'm not sure it's accurate.
Now I'm not 100% sure of this, but I believe that while normal vapour trails are left by the mixing of warm air from the exhuast of combustion engines with the cold air outside, vapour trails can also be left by any object that moves at great speed. It's caused by the condensation of water in the air due to the friction between the air and the solid object that high velocity causes.
If you have a look at photos of jets as they break the sound barrier (and other times actually), they condense a large plume of vapour in front and over the wings.
In this case, it's due to the sound waves overlapping and causing an area of high pressure.. if the air is humid enough, this will be enough to condense it an leave a vapour trail.
Jason.
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Jason, I know all about vapor trails... that was black smoke... from a combustion engine. Actually there was no engine cause its fake, but thats just what the creator forgot to keep track of, Combustion trails from a non combustion engine.