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Originally posted by ROBL240
Simple explanation being a ex-aircraft spotter myself. What your seeing is basically a shadow being cast upon a Contrail upon humidified air, the reason the effect doesnt occur with the other contrails is because they are already inside the airmass and thus the contrail wont cast upon the mixed air-layer because obviously you need something solid to cast the shadow upon (which in the other contrails cases will be the ground.)
This one seperate Contrail is most likely FL350 and well above the humified airmass (in the clearer air) which it is casting the shadow upon. I hope that makes sense.
Originally posted by atswheat
For some reason I thought I was going to get off without having to post any pictures.
Some evidence for your consideration (below).
What you'll see in the attached images are black lines that, in particular, are either ahead of the aircraft contrail presumably casting them as a shadow, or which remain straight as an arrow, despite the fact that the contrail they are presumed to be a shadow of turns sharply.
A facile explanation is just not possible given these images. And there are plenty more where these came from.
Originally posted by weedwhacker
reply to post by atswheat
I'm not so sure about the 3rd picture taken on a Florida beach
Originally posted by DangerDeath
In the picture above, where contrail angles, the projection can still be a straight line if the light is falling form a certain angle.
The zig zag movement is atypical to known aircraft.
Another possibility arises in regards to some contrails: an invisible craft producing them.