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.
But, I could be wrong. :-)
Jim Nichols
Tullahoma, TN USA
On 12/30/2013 11:33 AM, Bill Pearce wrote:
> There are three contrails, ergo a tri-jet?
>
> -----Original Message-----
> From: Jim Nichols
> Sent: Monday, December 30, 2013 3:39 AM
> To: Olympus Camera Discussion
> Subject: Re: [OM] IMG: High Altitude Jet
>
> :-) :-) :-)
> My current eyesight is not that good, Bill. My guess would be that it
> is a B737 of some sort.
>
> Jim Nichols
> Tullahoma, TN USA
>
> On 12/30/2013 2:27 AM, Bill Pearce wrote:
>> What is that? a DC10, L1011, B727?
>>
>> -----Original Message-----
>> From: Jim Nichols
>> Sent: Sunday, December 29, 2013 8:23 PM
>> To: LUG@xxxxxxxxxxxxxxx
>> Cc: Olympus Camera Discussion
>> Subject: [OM] IMG: High Altitude Jet
>>
>> While I had the X-E1 with 18-55 outdoors, I looked up and saw a nice
>> contrail overhead. Though I was short on focal length, I decided to
>> shoot it anyway. In post-processing, I realized that the jet is
>> visible, as well. Here is a heavily cropped image.
>>
>> http://gallery.leica-users.org/v/OldNick/High+Altitude+Jet.jpg.html
>>
>> Comments and critiques welcomed.
>>
>
--
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