747 touch down smoke vortices
Hello PPrunes,
https://youtu.be/6btf7jRBL2A
Here is a video of a 747 touchdown.
I am just curious about the touch down rubber smoke vortices formed.
If you watch the point of touchdown, the smoke gets funnelled up to the tailplane and then makes a vortice.
The one on the right moves clockwise and the one on the left moves anti-clockwise. This is the opposite of the wing tip vortice directions.
My thought is that it's due to the tailplane somehow, as in the flare the low pressure would typically be on the underside as the elevator is deflected up?
Any ideas, just out of curiosity?