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Contrails

Blackbird1331 From United States, joined Apr 2004, 1878 posts, RR: 1
Posted (5 years 5 months 4 weeks 1 day 12 hours ago) and read 796 times:

What causes them? My guess is the super hot exhaust meeting the super cold air. But where does the moisture come from? Is moisture in the exhaust? And, some scientists think they linger as clouds and form a heat shield in the atmosphere. Is there research being done on this by engine manufacturers?

Cameras shoot pictures. Guns shoot people. They have the guns.

9 replies: All unread, jump to last

Wilco From United States, joined Mar 2004, 355 posts, RR: 3
Reply 1, posted (5 years 5 months 4 weeks 1 day 12 hours ago) and read 779 times:

The topic of contrail build-up and causing a change- however small- in weather was discussed in this thread: http://www.airliners.net/discussions/general_aviation/read.main/1542165/6/

Real cool pic of contrail build-up thanks to NASA:

click here for the full story http://earthobservatory.nasa.gov/Newsroom/NewImages/images.php3?img_id=16528
Hope this helped...
-WILCO

"Ever seen a grown man naked?"

Timz From United States, joined Sep 1999, 5353 posts, RR: 6
Reply 2, posted (5 years 5 months 4 weeks 1 day 12 hours ago) and read 770 times:

I guess there's no "moisture" in the exhaust, but there's plenty of water vapor. That's what burning is-- fuel and oxygen being converted to water and carbon dioxide.

PU151 From , joined Dec 1969, posts, RR:
Reply 3, posted (5 years 5 months 4 weeks 1 day 12 hours ago) and read 752 times:

Plus those mind-control chemicals that the government sprays on everyone... I suggest this thread's name be changed to "Chemtrails" Big grin

Blackbird1331 From United States, joined Apr 2004, 1878 posts, RR: 1
Reply 4, posted (5 years 5 months 4 weeks 1 day 11 hours ago) and read 745 times:

Good job, guys. Thank you so much for your help.

Cameras shoot pictures. Guns shoot people. They have the guns.

Avioniker From United States, joined Dec 2001, 1098 posts, RR: 16
Reply 5, posted (5 years 5 months 4 weeks 1 day 11 hours ago) and read 740 times:

AAAAAAAAAAARRRRRRRRRRRRRRRRRRRRRRRRRRGGGGGGGGGGGGGGGGGGGGGHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHh

Chemtrails again?

One may educate the ignorance from the unknowing but stupid is forever. Boswell; ca: 1533

Blackbird1331 From United States, joined Apr 2004, 1878 posts, RR: 1
Reply 6, posted (5 years 5 months 4 weeks 1 day 10 hours ago) and read 727 times:

Avioniker, check your spelling. I still would like to know if this issue is being addressed by the engine manufactuerers. Just asking.

Cameras shoot pictures. Guns shoot people. They have the guns.

Espion007 From Denmark, joined Dec 2003, 1691 posts, RR: 0
Reply 7, posted (5 years 5 months 4 weeks 1 day 10 hours ago) and read 720 times:

damn you Pu151! you beat me too it! Big grin

contrails form when hot engine exhaust hits cold air very fast.droplets stick togeather to form something similar to clouds.Same thing happens with your breath on a cold day,just on a smaller scale,and not as cool Big grin

Snakes on a Plane!

Avioniker From United States, joined Dec 2001, 1098 posts, RR: 16
Reply 8, posted (5 years 5 months 4 weeks 20 hours ago) and read 633 times:

The issue is being addressed very highly by manufacturers. It is of extreme interest to the military who don't want to give a visual cue to anti-aircraft emplacements.
There is considerable research being done in Tulahoma TN at the Arnold Test Facility and other locations around the world.
Along with providing a visual locator the contrails cause a focal point for Infrared variances.
One of the things being looked at is the possibility of gleaning more energy from the engines. One theory being that if the air coming from the tailpipe can be caused to be as close as possible to the air into the intake the engine has used more of the available energy and it'll be harder to target as well.
That is, of course, impossible with current technology but P&W came close with the F100 engine at full power without reheater. They got it down to a 100deg F difference between intake and exit in 1974.
I wonder what they're doing now???

One may educate the ignorance from the unknowing but stupid is forever. Boswell; ca: 1533

Blackbird1331 From United States, joined Apr 2004, 1878 posts, RR: 1
Reply 9, posted (5 years 5 months 4 weeks 14 hours ago) and read 601 times:

Thank you Avioniker, that is the information I was looking for. I hope to post some information on any continuing research in this area that I might find.

Cameras shoot pictures. Guns shoot people. They have the guns.

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