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Old 08-01-2022, 12:27 PM   #171 (permalink)
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Originally Posted by AeroMcAeroFace View Post
Was that because it is away from vortices from the A-pillar or because it created separation all down the side of the car in its wake?
The car's near-field flow interfered with the mirror, while the mirror's near-field flow interfered with the car.
By moving the mirror away from the body, to perhaps the initial outboard streamline's distance, it essentially began to 'fly in formation' with the car, neither affecting the flow of the car, or vice versa.
And this also relied on careful shaping of both the mirror housing and mounting strut.
An added side benefit was a lower acoustic signature ( noise-vibration-harshness ).

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