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What do those strakes do?
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Strakes are vestigial fences. Fences have two functions, preventing intrusion from the sides and channelize or straighten the flow.
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Its design includes vertical fences, some of which are curved, some stepped, and some angled, but all are developed through constant tweaking and evolution in the wind tunnel. The basic job of these fences is to keep apart the many different types of air flows found at the rear end of an racing car - areas of low pressure air due to the rear wheels, and the rear wing, and the air coming under the floor. All these different air flows have different energy levels and different speeds, and their separation makes them easier to deal with.
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formula1-dictionary.net: Diffuser
More good stuff there, I learned about diffuser stall when you stand on the brakes.
