Airplanes

[ag]

Have you ever looked up in the sky and seen a plane flying REALLY REALLY high and as it flys along it leaves this white trail behind it? What is that and what is it caused from? And what type of air planes are these that fly so high up in the sky like that? Are they Military or civilian?

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[DroopyGirl]

all I know is that the last time I was on a plane, I looked out the window and saw those white trails next to us.. so I guess it's from civilian planes..

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[HordeKing1]

They are called "contrails," which is short for "Condensed trails."

There are 2 ways contrails form. The first is far more common.

1. The jet engine's exhaust adds water vapor to the air and sometimes causes the air to become super-saturated. Because there an overabundance of water, some of it condenses and forms the cloud you can see from the ground.

2. The other type of contrail is caused by an aircraft's wings instead of its engine. When the air moves past a wing it creates a low pressure area (which is how planes fly - the wings lift the plane up). The lower pressure causes the air to cool and possibly reach saturation. This type of contrail doesn't last very long; it gets disrupted by the aircraft's wake.

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[ag]

Thanks HK, in addtion, it oveoulsy has to have some type of on/off thing. When you see those sky writers during the summer

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<marquee>There's a place in the world for the angry young man With his working class ties and his radical plansHe refuses to bend, he refuses to crawl,He's always at home with his back to the wall.And he's proud of his scars and the battles he's lost,And he struggles and bleeds as he hangs on the cross-And he likes to be knowns as the angry young man. </marquee>

[HordeKing1]

Skywriting is not a contrail, but rather a controled release of vapor.

EDIT: A contrail is also not to be confused with a snail trail...

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This message was edited by HordeKing1 on 5-22-02 @ 12:07 AM