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Old 05-17-2019, 01:09 PM   #13 (permalink)
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Dirt doesn't affect drag but rear-view mirrors do. There is going to be some scale, depending on the thickness of the attached flow, below which there's no difference.

It might depend on the angle of the flow to lengthwise of the trim. And it might be possible to over-reach for the optimum.

Donít push your slower friends down in an attempt to save yourself from a bear, advises National Parks Service

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