1
0

[–] Inara__Serra 1 points 0 points (+1|-1) ago 

Speed.

1
1

[–] grandmacaesar [S] 1 points 1 points (+2|-1) ago 

Contrails are formed by water vapor being super-cooled as it passes through a jet engine. The frozen vapor is quickly melted by the sun. This phenomena only occurs above 35000 feet, and the humidity and barometric pressure has to be just right. The lines seen crisscrossing our skies today are not contrails. They are man-made clouds, most likely used for weather modification...what many people call "chemtrails".

1
0

[–] Inara__Serra 1 points 0 points (+1|-1) ago  (edited ago)

Partially incorrect. Old radial engine aircraft also left contrails.

https://www.youtube.com/watch?v=JuDN4WNwmJ4

https://en.wikipedia.org/wiki/File:Bomber_stream.jpg

https://www.youtube.com/watch?v=wfOrez6q7WM

They are formed by aircraft at altitude. Period. The moisture content in the air at that altitude and whether that air is warm or cold determines whether or not there are contrails.

Chemtrails are figments of the imagination.

[–] [deleted] 1 points -1 points (+0|-1) ago 

[Deleted]

0
0

[–] WhyNoDonuts 0 points 0 points (+0|-0) ago 

Afterburners maybe? What kind of planes sho the zappers use?