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Originally Posted by aerohead
By limiting where the air can be,and providing locked-vortices all around,the outer flow can skip over the egg crate as with Texas Tech's cab wing/half tonneau on the pickup.
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The pick-up rear gate / partial bed cover seems a good analogue when trying to understand how these base plates work.
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They're not as good in a crosswind,but they're way out ahead of nothing,extremely light,easy to manufacture,and should cost very little.
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And when disguised as a cargorack or bikerack, or actually doing double duty as a rack, it won't draw that much attention.