Jan Mogren
Topic Author
Posts: 2014
Joined: Tue Dec 26, 2000 2:47 am

Contrails Not From Engines

Wed Oct 29, 2003 3:50 am

A month or so ago I shot this aircraft overflying. I didn't see anything special until I checked the photo later.
The contrails seem to come from the wings. Also note the rainbow effect.
Probably has to do with ice crystals?



I can't remember seeing this before.

/JM
AeroPresentation - Airline DVD's filmed in High Definition
 
garnetpalmetto
Posts: 5351
Joined: Tue Oct 21, 2003 1:38 am

RE: Contrails Not From Engines

Wed Oct 29, 2003 4:27 am

It's the chemtrails man! The man's trying to keep us down man! *puts on tin foil hat and goes into his bomb shelter to light one up*
South Carolina - too small to be its own country, too big to be a mental asylum.
 
Jan Mogren
Topic Author
Posts: 2014
Joined: Tue Dec 26, 2000 2:47 am

RE: Contrails Not From Engines

Wed Oct 29, 2003 5:29 am

LOL !
But really, has anyone seen this before? Have I just missed it ?
/JM
AeroPresentation - Airline DVD's filmed in High Definition
 
donder10
Posts: 6945
Joined: Sun Oct 21, 2001 5:29 am

RE: Contrails Not From Engines

Wed Oct 29, 2003 6:02 am

Jan,
there was another post somewhere(might have been elsewhere)on a similar topic,I'll try to dig it out.I believe it's to do with atmospheric conditions but I'll have to check.
Out of interest,what focal length was that taken at?
Cheers,Alex
 
fspilot747
Posts: 3455
Joined: Mon Nov 01, 1999 2:58 am

RE: Contrails Not From Engines

Wed Oct 29, 2003 6:23 am

Jan Mogren,

Contrails can form in two ways, from the engines, and from the cooling process--the air flowing over the wings. When the cooling is sufficient enough to saturate the air, you get a "dynamic contrail," which looks like what you've got there. It usually dies fast in the plane's wake.


Cheers
 
Jan Mogren
Topic Author
Posts: 2014
Joined: Tue Dec 26, 2000 2:47 am

RE: Contrails Not From Engines

Wed Oct 29, 2003 7:14 am

Alex,
it was a 300mm, cropped just the middle part of it.

FSPilot747
to the naked eye they looked like normal contrails as far as I can remember now, but perhaps they died out quicker?

/JM
AeroPresentation - Airline DVD's filmed in High Definition
 
SAS-A321
Posts: 348
Joined: Thu Mar 14, 2002 11:44 pm

RE: Contrails Not From Engines

Wed Oct 29, 2003 5:51 pm

Looks like an SAS MD80 or MD90. Where was the picture shot?
It's Scandinavian
 
Jan Mogren
Topic Author
Posts: 2014
Joined: Tue Dec 26, 2000 2:47 am

RE: Contrails Not From Engines

Wed Oct 29, 2003 6:59 pm

Onsala, just south of Gothenburg.
/JM
AeroPresentation - Airline DVD's filmed in High Definition
 
bio15
Posts: 1048
Joined: Fri Mar 23, 2001 8:10 am

RE: Contrails Not From Engines

Thu Oct 30, 2003 12:01 pm

Oh my god, I think they...... uh............... no it can't be............ just maybe............ CHEMTRAILS!


The photo is probably edited. Look at the "contrails" and they don't even come out of the engines. The true contrails are formed a short distance away from the engines exhaust nozzle, not beside it. They also generally come out in the same axis line of the engines, not to the side. There's nothing strange on that picture. Except, obviously, the two thinner lines which are chemical trails put in the aircraft by some dudes to help with the government conspiracy, and blah blah........  Smile

Now seriously, nothing but a photo edit.
Only trust airliners.net pictures  Smile

-Alfredo
 
meister808
Posts: 924
Joined: Sat Jan 01, 2000 11:45 am

RE: Contrails Not From Engines

Thu Oct 30, 2003 12:08 pm

How is that a photo edit? It seems to me that everything lines up pretty well for dynamic contrail, as FSPilot747 talks about. It makes sense that a dynamic contrail would come from the inboard wing, where there is the least disturbance, and then it can even be seen where the jet wake comes into the picture, where the contrail gets choppy on the inside.

-Meister
Twin Cessna 812 Victor, Minneapolis Center, we observe your operation in the immediate vicinity of extreme precipitation
 
bio15
Posts: 1048
Joined: Fri Mar 23, 2001 8:10 am

RE: Contrails Not From Engines

Thu Oct 30, 2003 12:46 pm

You're absolutely correct Meister. I missed the engine trails forming near the disturbances. I had thought that if there are no engine generated trails there should be no wing generated ones, therefore it's edited. Good observation, I'll take back my previous comment on it being a photo edit.


Still positive on the chemtrails though

 Smile nah just kidding
-Alfredo
 
lehpron
Posts: 6846
Joined: Tue Jul 10, 2001 3:42 am

RE: Contrails Not From Engines

Thu Oct 30, 2003 1:45 pm

More than likely, the vortices coming off the wings interfere with the jet exhaust and mostly expand the contrail out so it may appear to have more than one source, being the engine. Other than engine pressure, that is one of those reasons.
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