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Thread: Contrails/Chemtrails from jets
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04-29-2009, 03:26 AM #1Senior Member
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Contrails/Chemtrails from jets
Everyone has seen "Contrails (Condensation Trails) from jet planes. Apparently some people believe there is a distinct difference from a contrail that disappears very quickly and a "chemtrail" that lingers for hours and hours in the sky dissipating very slowly while it spreads out. Conspiracy theorists on this issue (I'm not one of them) believe there is something nefarious in regard to chemtrails.
Either way, maybe this year has been a drill year for the National Guard and Air Force, but I see more fighter jets and other non-commercial jets in the sky; or, maybe I'm just noticing them now and didn't really pay attention to them much before. I'm about 150 miles each way to two different National Guard bases.
Here's my question: Why is it that I can not recall seeing contrails/chemtrails from commercial passenger carrying jet liners?
Why to my recollection (I could be wrong) are they only given off by military aircraft? Because military aircraft fly at much higher altitude and the air temp/composition is such that it makes spent jet fuel look like that whereas lower altitudes don't produce contrails/chemtrails? Possibly. But, the military aircraft also fly at altitudes that I believe are in the same range as commercial airliners and you still see contrails/chemtrails from the military aircraft. I just had to pull over and snap a few pics a few hours ago when I was on the way home. These are lower altitude contrails/chemtrails that appear to have been in the sky long enough to where they're blending in to existing clouds:
The chemtrail can be seen on the picture above running parallel with the power lines. It's hard to tell from the pic, but the chemtrail ran on for miles to the right of the pic and blended in with the cloud formation on the left and center of the pic.
Within the last six months or so, on a weekend when I was spending a significant amount of time outside I noticed 10+ military jet higher altitude passes which created chemtrails. It's distinct in my memory because as the day progressed, the chemtrails ended up dispersing into cloudlike formations and at the end of the otherwise cloudless day, there was noticeable "cloud cover".
Chris L"Blues fallin' down like hail." Robert Johnson
"Aw, Pretty Boy, can't you show me nuthin but surrender?" Patti Smith
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04-29-2009, 04:41 AM #2Dapper Dandy
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It was so they could be nefarious in the shade
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04-29-2009, 06:17 AM #3Senior Member
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Finally a question I am qualified to answer!
I am already a jet engine mechanic and halfway through my commercial pilot education.
The contrail is basically the water that is produced in the combustion inside the engines (hydrogen from the fuel and oxygen from the air) that is cooled down and condensates.
How long they hang around depends a lot on the winds up there and the humidity, temperature and other factors.
There are contrail from passenger jets too. I guess one of the reasons that they might last longer could be that the military jet engines give off more carbon particles (soot) than the civil ones. I think it has got something to do with the loads military engines are put under they give them a richer mixture of air/fuel to avoid engine flameout during those loads. And at that altitudes those soot particles will work as condensation nuclei that causes water to condensate easier, so that might sustain the contrails to a certain degree.
It is way too late here, but I will def. look at this thread tomorrow.
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04-29-2009, 09:57 AM #4
Thanks
Originally Posted by flyboy
Finally a question I am qualified to answer!
I am already a jet engine mechanic and halfway through my commercial pilot education.
...
It is way too late here, but I will def. look at this thread tomorrow.
I recently found out that there are conspiracy nuts who have wild theories about chemtrails, and how they are meant to control you and how a piece of copper wire can scare them away...
I know we have some conspiracy theorists on board here, but I hope that none of them actually believes the chem trail drivel.Til shade is gone, til water is gone, Into the shadow with teeth bared, screaming defiance with the last breath.
To spit in Sightblinder’s eye on the Last Day
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04-29-2009, 11:58 AM #5---
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Formula 1 cars have different emissions to road cars.
They are just different. Built differently, used differently and regulated differently.
A passenger jet will only "floor it" when taking off. Military pilots will be constantly doing the aerial equivalent of standing quarters, flat-out runs, doughnuts and handbrake turns. At least I would!
From that "ninjas are cool" page...how a piece of copper wire can scare them away...
http://www.youtube.com/watch?v=DnM1G8S2uF4Last edited by Rajagra; 04-29-2009 at 12:01 PM.
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04-29-2009, 12:01 PM
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Well, living in London you can imagine how crowded our skies are with traffic, what with the world's busiest airport as well as 4 other international airports nearby. As far as I can tell, the commercial flights all produce trails (I don't know if they're con- or chem-). Obviously this is hard to see on a cloudy day
04-29-2009, 12:36 PM
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True, that. I had never even heard of contrails until a few years ago. I had grown up in London thinking they were just normal clouds.
05-29-2009, 04:26 AM
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Here's my question: Why is it that I can not recall seeing contrails/chemtrails from commercial passenger carrying jet liners?
Chris L
I take landscape photos early in the morning and I see them all the time from private aircraft, more than I would like.
Later,
R
05-29-2009, 04:39 AM
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ChrisL, to answer your question, yes, they may have climbed a few feet higher, and it started. the atmosphere has layers, very similar to thermocline layers in the ocean.
As for influencing weather, that is done, has been done, and is well known in some circles to kinda work. problem is that it is very expensive for not as much benefit as some would like. but many places seed clouds to prevent huge hail, and other phenomena. mostly done with regular commercial ag spray planes with pilots wearing O2 masks.
05-29-2009, 11:09 AM
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That would explain a funny contrail I saw the other evening. It started and ended within a relatively short length, i.e. did not stretch across the sky, and certainly could not be traced to a jet, which had presumably long gone. It was as if the trail was much longer but just this section survived. It floated slowly across a completely clear sky for many minutes. I came to the conclusion that that 'section of sky' must have different atmospherics, but the section of course could be higher/lower, not just lateral as it appears from the ground.
