Vapour....trails that is

[QuikSanz]

Hi,
Well, it takes a certain amount of humidity. A wing flies by creating a VERY low pressure above the wing. expanding air cools, water vapor condenses in this low pressure area and becomes visable. if cold enough this vapor will freaze and stay suspended for a while.

Chris

[QuikSanz]

Hi,
Well, it takes a certain amount of humidity. A wing flies by creating a VERY low pressure above the wing. expanding air cools, water vapor condenses in this low pressure area and becomes visable. if cold enough this vapor will freaze and stay suspended for a while.

Chris
Darn double post

[QuikSanz]

Hi,

Altitude and humidity are the big factors here.If cold enough in the low presure area, the vapor can freaze, the conditions must be just right. combination air temp, wet and dry bulb, which factors in humidity. also altitude and velocity have a role and also wing loading.

Chris

[QuikSanz]

Hi, Actually blobrana is right you don't need an engine. Living in southern California I have been privlaged to see the shuttle come in.when high up with the heavy wing loading it creates an extreame low pressure and if the humidity is not too high the vapor freazes and hangs for a while. Of course you all know when the shuttle returns it is a glider. Now if you were to watch it land at florida you will see the transient vapor trails that can't hang around to long. Humidity & temps too high.

Chris

[QuikSanz]

@ JaXanim

qoute,
I also need the air pressure at say 30-40,000 feet.

I used to know this but it's been too long. Any pilot should have the answer to that one. Any Pilots out there.

Chris

[QuikSanz]

@ Fluffy

By the time it gets to here it's barely over mach 1 cause it will land @ Edwards as soon as it clears the mountains. Aproxx 100 miles.

Chris

[QuikSanz]

@ JaXanim,

AWEB won't work on that site, bummer. I'll either check it at work or my A1 when it shows up monday. As for engine related trails I belive the coditions are relativly simaler. We also get other neet shows in So.Cal. Once in a while they'll launch a military rocket from Vandenberg AF base. with the Oxygen/ Hydrogen fuel they use it makes for a great trail at least 100 mi. long. Now that stuff has to freeze.

Chris