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Old 05-14-2020, 08:02 PM   #29 (permalink)
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Originally Posted by MHR1294 View Post

I had a 2001 Volvo V70 T5 which had a high mount spoiler with a "hole/slot" in it.

Interesting thing happened, you could see the giant swirls in the mirror generated when it was raining in the spray. You could see 2 big swirls forming on the rear window coming down from the upper middle an spreading out. So looking from the rear, that's clockwise on the left and anti-clock on the right.

With the hole covered up, the dirt left on the rear window was more uniform spread. Fuel consumption was a little bit worse too, however the scale only reads to the nearest 0.1mpg (imp) so 0.4mpg improvement might not be as significant when you take in other factors.

so, I don't know what it was doing, but it was definitely doing something.

Perhaps it's performing a similar function on the fiesta?
Interesting. Trailing vortices that rotate (viewed from behind) clockwise on the left and anticlockwise on the right are indicative of the body developing lift.
Modifying the Aerodynamics of Your Road Car

A really good book that should be added to the library of everyone working in automotive aerodynamics, as well as those making car aero modifications at home. - Rob Palin, former Tesla aerodynamicist
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