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Old 09-02-2013, 08:39 PM   #30 (permalink)
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The “large wind tunnel” in Untertürkheim | Mercedes-Benz Passion eBlog

It was mentioned above that underfloor drag is responsible for about one-third of the total drag of a current car. The other proportions are also easy to remember – about one-third for all the exterior surfaces and the last third caused by airflow required for engine cooling. (See Modifying Under-Car Airflow, Part 1.)
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