Drag coefficient is the value you multiply the ACTUAL frontal area of the bus by to get the actual drag of the bus. Aha you say- so a bus might have a lower coefficient of drag than a beetle, but still have MORE drag, because it's got a larger frontal area? Exactly. A drag coefficient of 1 means the object has the same drag, *per square whatever*, as the proverbial brick wall. 0.35 is a typical value I've heard quoted, and 0.19 is the lowest I've ever heard of. Some race cars get up to .4x in search of downforce. Bill
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