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Originally Posted by Gasoline Fumes
I did some tuft testing with my ugly old Honda Civic Wagon. Lousy photos, didn't get any help!
Hood, windshield and roof looked good.
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Yes, very seldom any problem in these areas on any car of the last 30 years
Looks excellent with smooth wheel cover
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It looked like air was going under the side skirt:
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Often the case - airflow is travelling towards the low pressure area under the car.
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Side mirror:
Side mirror removed:
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Flow on the door window is
better with the mirror present! Mirror present: main door glass flow separation only behind mirror support. Mirror not present: main door glass separation more prevalent.
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I was so surprised by the air moving upwards behind the A pillar that I added more tufts!
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Flow pattern directly behind A pillar is common - I assume it indicates the developing of a trailing vortex off each front pillar. Removal of mirror appears to have increased the area of this flow substantially. It would be interesting to do throttle stop drag testing with and without the mirror.