Ogier
https://youtu.be/YA8KIvIZ5L0
Printable View
Gryazin for Corsica
https://www.youtube.com/watch?v=XdV5odNOcI0
Sordo https://youtu.be/VXMgTd0u67c
What is this big 'thing' on the roof??
Yes, but even so you can measure the impact of the car on air flow speed, probably at different heights over the roof. It could also be useful as a validation for numerical simulation (CFD) results.