Lets see your racelouvers

[NightmareMoon]

Correct me if I’m wrong but due to the strings moving and direction I am thinking there is a circular vortex from the windshield to the top of the vent/closest to the windshield?
like what happens in the back of a uncovered bed of a pickup truck with the bed tailgate closed.

iDK if you’re wrong or right, thats the point of the strings - to see and not speculate.

I wouldnt read too much from the weak flow at the rear. Theres a lot of engine blocking flow in that area.

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