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How Come NO Contrails?  
User currently offlineBlasphemystic From United States of America, joined Feb 2005, 213 posts, RR: 0
Posted (6 years 5 months 2 weeks 4 days 19 hours ago) and read 1087 times:

How Come No Contrails? (by Blasphemystic Aug 30 2005 in Civil Aviation)


The true measure of a man is how he treats someone who can do him absolutely no good. -- Samuel Johnson
2 replies: All unread, jump to last
 
User currently offlineFlykal From Australia, joined Sep 2003, 438 posts, RR: 5
Reply 1, posted (6 years 5 months 2 weeks 4 days 19 hours ago) and read 1074 times:

You are correct when you say that many factors affect the formation of contrails, but primarily it depends on atmospheric humidity. There is no guarantee that an aircraft at FL390 will generate contrails.

Certain regions will change seasonally so a certain times of the year you may see contrails, while other seasons may not produce them. Obviously humidity is dependant on the amount of water in the air and contrails are also dependant on the temperature of the air and the heat and water that comes out of the jet engine exhaust.

Higher humidity will generally mean that contrails stick around for longer, while lower humidity means you get contrails with a shorter life span.


One doesn't discover new lands without consenting to lose sight of the shore for a very long time
User currently offlineAirWillie6475 From United States of America, joined Jan 2005, 2448 posts, RR: 2
Reply 2, posted (6 years 5 months 2 weeks 4 days 16 hours ago) and read 1039 times:

When you see long contrails in the sky during clear days, you can expect buliding of clouds with in 24 hours.
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