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Re: [OM] IMG: High Altitude Jet

Subject: Re: [OM] IMG: High Altitude Jet
From: Chris Barker <ftog@xxxxxxxxxxxxxx>
Date: Mon, 30 Dec 2013 21:37:43 +0000
I wouldn't have thought that it would be vortices, Jim, not at cruise speeds;I 
should have said that contrails always came from the engines. 

The other sort of "trail" is merely condensation because of the reduced 
pressure in vortices – traditionally from the wingtips at high angles of 
attack, but increasingly from further inboard as wings and fuselages become 
more aerodynamically efficient

Your photo shows 2 contrails, it's just that one is distorted, making it look 
like a total of 3.

Chris

On 30 Dec 13, at 20:41, Jim Nichols <jhnichols@xxxxxxxxxxxxx> wrote:

> Things get complicated, Bill.  Yes, contrails can be formed as a result 
> of moisture content in the engine exhaust.  But they can also be formed 
> by the pressure and temperature gradients in tip vortices.  This can be 
> affected by the presence or absence of "winglets".  And the tail 
> surfaces can also shed vortices.
> 
> I would not count trailing condensation lines and equate that to the 
> number of engines.  From the sun's reflection off the large nacelles, I 
> would associate the shape with that of a large twin-jet.

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