Video of helicopter leaving "chemtrail"?

Trailblazer

Moderator
Staff member
This video allegedly shows a helicopter at fairly low altitude spraying some kind of "chemtrail":




The trails appears to be associated with a small cumulus cloud, with the helicopter "dragging out" small puffs of cloud as it flies through the cloud, but the exact mechanism is a mystery to me. Any thoughts?
 
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Trailspotter

Senior Member.
This video allegedly shows a helicopter at fairly low altitude spraying some kind of "chemtrail":


The trails appears to be associated with a small cumulus cloud, with the helicopter "dragging out" small puffs of cloud as it flies through the cloud, but the exact mechanism is a mystery to me. Any thoughts?

It does not look to me that the trail is associated with that cloud, as at the end of the video the trail's remnants are well behind it along the helicopter track. This means that the trail and the cloud are probably at different altitudes

I am not 100% sure that the trail is associated with the helicopter, but, if it is, it appears to come from the rotor blades. They are known to make wingtip vortices in humid conditions.

Could it be some kind of an aerodynamic trail?

Vortices due to Helicopter Blades rotation (http://sitemaker.umich.edu/saiprasad/cool_cfd_simulations).
 
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Spectrar Ghost

Senior Member.
I don't know. There's a vortex that appears in the first few seconds that seems to be through the cumulus cloud. I think the idea that the trail is moisture from the cloud entrained in the helo's vortex has merit.
 

Efftup

Senior Member.
That's what I would have though because there seems to be a very tiny bit of trail before the main part of the cloud and a little bit after that, after which it stops, (as you can even hear the video maker at 0:20 says "come on , spray you bastard") as there is no "spray" at all after the first few seconds of video.


Interesting also that the video poster seems to claim a HUGE knowledge of the spray campaign. In the comments when someone asks just how much they think a helicopter can carry, the OP claims a 2kg bag of mix can spray 1000 miles of trail.

That is 2g per mile or 1.2 mg per metre.
 
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Trailspotter

Senior Member.
I don't know. There's a vortex that appears in the first few seconds that seems to be through the cumulus cloud. I think the idea that the trail is moisture from the cloud entrained in the helo's vortex has merit.
I don't know either whether it flew through a cloud or beneath it. Here are two screenshots showing relative positions of the trail and the cloud(s) in the beginning and near the end of the video, respectively:
View attachment 12943
View attachment 12944
 

Trailspotter

Senior Member.
Best Helicopter contrail above the Arctic Circle - fairly self explanatory and included FYI :)

Not really. These are exhaust contrails due to extremely low temperatures on the ground, which are shaped by the rotor blades vortices. There are photos of helicopter contrails of this kind here at Metabunk.

The OP case is different but it is not novel, here is a previous similar video:
In this case, the trail clearly comes from the rotor blades.
 

MikeC

Closed Account
Yes I know they are different......but helicopter contrails of any sort are relatively rare so the FYI bit is to help people with a resource to show that they do exist in the first place....when atmospheric conditions are right for them, as with all other contrails :)
 
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