> both produce a vapor cloud, and the sports illustrated
> blurb suggested that this occurs just as the plane
> goes super-sonic. i doubt that the fly-by in the mpeg
> was even near super-sonic that close to the ground and
> crew.
>
I haven't seen the picture, but if the vapor cloud has a straight leading
edge
that trails off at 45 deg. angles, IT IS THE SOUND BARRIER!!!!
lately i've begun noticing vapor clouds
> forming behind the wings in certain spots in the air.
> yesterday, i saw this for sure, as a plane flew directly
> overhead and relatively low. i could see a vapor trail,
> maybe 10% of the wing chord behind the wing. obviously,
> i can't see if it forms above the wing.
>
> what is this, and what is its cause?
The low pressure area precipitates the available moisture into a cloud.
You can also see this on the top surface of most fighter jet wings when they
perform high G maneuvers and from the wing tips of many jets.
The effects are dependent on the available moisture in the air.
We don't see it much in AZ.
Mark Mech
[EMAIL PROTECTED]
www.aerofoam.com
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