Originally Posted by
Narbs
Well.... thanks for nothing. I was really hoping to get clear scientific answers to support or discredit what I'm seeing. I guess it's easier to mock and dismiss what you don't understand.
I'm an airline pilot and an engineer with a strong chemistry background. I understand contrails completely. They are frozen water vapor which is a jet fuel combustion by-product.
The variable shapes and visibility are caused by different light angles, humidity, engine design, and wing/fuselage aerodynamics.