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#77982 08/09/02 01:38 PM
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Carpal Tunnel
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I believe that contrails is the term I've always heard. Chicago, Boston, Flagstaff, Orange County, Upstate New York.


#77983 08/09/02 01:52 PM
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Carpal Tunnel
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like Fishona, i know the term contrails but i don't think i have ever spoken it.. i speak of vapor trails.

they are more common nowdays, i remember when 90% of transatlantic flights stopped for a final refueling at boston, (Non stops direct from NY to most parts of europe were not common in the early 1960's)-- Now, you can go Nonstop from paris to chicago! (and farther i am sure.. i just don't fly in or out of chicago, so i don't much think about it)


#77984 08/10/02 03:07 PM
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Carpal Tunnel
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Yea, Atomica!

condensation + trail

Edit Oops--never mind! Should have read yours closer, sjm.


#77985 08/12/02 01:35 AM
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formerly known as etaoin...
#77986 08/12/02 02:43 AM
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Cool, eta--thank you. Interesting; this is something I had never given a thought to, though I shouldn't wonder if all the air traffic doesn't change the actual wind patterns. Whitman, do you happen to know? I guess this was, in fact, a once-in-a-lifetime opportunity: authorities would never shut down air traffic for 3 days just so the impact of contrails could be studied.


#77987 08/12/02 09:39 PM
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Well, Jackie, I'm not a scientist, but I would imagine that the phenomenon of a jet crossing a jetstream would be unlikely to make more than local changes to its behaviour. They are caused by a mixture of weather systems and coriolis force, so I figure that there would have to be one hell of a lot of jets flapping about up there to initiate a change.



The idiot also known as Capfka ...
#77988 08/13/02 06:30 PM
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wow Offline
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I shouldn't wonder if all the air traffic doesn't change the actual wind patterns.

I don't think it likely Jackie. Lived near Pease AFB during Cold War and humongous bombers (SAC) would take off every 15 or 20 seconds and fill the air with contrails. They took off using the Rye Becaon and flew over my back yard. No wind changes - ground to treetops. No weather changes at all were felt or reported.
Contrails is used exclusivelt by all Air Force types I have ever met to designate the white trails left by (especially)jet engines across a blue sky.

I don't think slower piston-driven-engine planes flew high enough to leave contrails.
Anybody?



#77989 08/14/02 10:38 AM
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I don't think slower piston-driven-engine planes flew high enough to leave contrails.
Anybody


I have a sort of memory of contrails behind the Lockheed Super-Constellations in the late fifties/early sixties. But I may be wrong, there. By that time, there were jet airliners flying around, as well as military stuff, so I may have got mixed up.
(Although I do have to say that I was pretty hot on aircraft recgonition in those days.)


#77990 08/16/02 10:23 PM
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Contrails are a product of a certain combination of humidity and temperature in the atmosphere. The combination occurs most often at higher altitudes. However, Rhube is quite right. One of the most famous photographs of dogfighting during the Battle of Britain shows contrails behind a goodly number of the aircraft which I believe were Messerschmidt 109s and Hurricanes. Not a jet among 'em.



The idiot also known as Capfka ...
#77991 08/17/02 08:15 PM
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wow Offline
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Of course you are both correct, and right, too!
When I thought non-jet I flashed to Piper Cub type puddle jumpers. Of course larger prop planes would fly high enough to leave contrails.
I have these "moments' you see....


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