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Originally posted by _Anubis_
1. Could these trails be created from a new series of jet engine and not from some sinister aerosol?
2. What is the motivation behind their actions? Why would someone do this?
Originally posted by ANOK
1. No. Contrails are formed when hot engine gasses hit cold air, kinda like your breath on a cold day. The "type" of jet engine makes no difference.
Originally posted by HowardRoark
Originally posted by ANOK
1. No. Contrails are formed when hot engine gasses hit cold air, kinda like your breath on a cold day. The "type" of jet engine makes no difference.
Actually it has a whole lot to do with it. You see, the more effecient an engine is, the more water it produces per pound of thrust as opposed to partially burnt fuel vapors per poound of thrust.
The high bypass engines are very fuel effeicent, therefore they tend to produce more water vapor per mile of flight than the old style turbojets.
Originally posted by ANOK
Once a contrail is formed it's the atmosphere that controls the trail not the engine.
You are right a bigger contrail may be formed but size here is not the argument, it's how long they persist once they are formed.
Chem trails last all day BTW, contrails don't.
Originally posted by HowardRoark
Originally posted by ANOK
Once a contrail is formed it's the atmosphere that controls the trail not the engine.
Wow, you finally learned something. I have some hope for you after all
Originally posted by ANOK
And BTW contrails form in a similar way your breath forms on a cold day, does your breath form a cloud and last all day?
[edit on 27/2/2005 by ANOK]
Originally posted by sensfan
Nice pics pf CONtrails. Chemtrails are a myth that don't exist in my opinion.
EARLY this morning 28-2-2005, 0700 - 0900, South-east england and there were "CHEMtrails" WITHOUT doubt I believe I saw chemtrails as there were planes at a higher altititude that were leaving a "CONtrail" and that trail dissipated within TEN minutes
Originally posted by sensfan
You've got your answer right there
EARLY this morning 28-2-2005, 0700 - 0900, South-east england and there were "CHEMtrails" WITHOUT doubt I believe I saw chemtrails as there were planes at a higher altititude that were leaving a "CONtrail" and that trail dissipated within TEN minutes
Different altitudes mean different atmospheric conditions, therefore different traits in the contrails from the planes.
Contrails form when hot humid air from jet exhaust mixes with environmental air of low vapor pressure and low temperature. The mixing is a result of turbulence generated by the engine exhaust. Cloud formation by a mixing process is similar to the cloud you see when you exhale and "see your breath". The figure below represents how saturation vapor pressure varies as a function of temperature. The blue line is the saturation vapor pressure for ice as a function of temperature (in degrees Kelvin). Air parcels in the region labeled saturated will form a cloud. Imagine two parcels of air, A and B as located on the diagram. Both parcels are unsaturated. If B represents the engine exhaust, then as it mixes with the environment (parcel A) its temperature and corresponding vapor pressure will follow the dotted line. Where this dotted line intersects the blue line is were the parcel becomes saturated.
If you are attentive to contrail formation and duration, you will notice that they can rapidly dissipate or spread horizontally into an extensive thin cirrus layer. How long a contrail remains intact, depends on the humidity structure and winds of the upper troposphere. If the atmosphere is near saturation, the contrail may exist for sometime. On the other hand, if the atmosphere is dry then as the contrail mixes with the environment it dissipates. Contrails are a concern in climate studies as increased jet aircraft traffic may result in an increase in cloud cover. It has been estimated that in certain heavy air-traffic corridors, cloud cover has increased by as much as 20%
Originally posted by ANOK
Contrails don't last for more than a couple of minutes because it is a reaction of hot gasses in cold air. Clouds form from evaporated water, that's why they last. It's a totally different process.
[edit on 27/2/2005 by ANOK]
Photographs which show military aircraft with sprays coming from unusual locations on the aircraft are usually re-touched photos (a process that is easy to create using common computer programs).