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there is something off on your first graph, majorly off
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well it's just a graph i got somewhere of the web to illustrate a generic wake as it might come of a flat plate. so i make no claim as to the accuracy of anything pictured
i don't know all that much about aerodynamics, but the main difference i see is the R value i have no idea what that stands for in this graph (reynolds number perhaps?) but it might explain the different numbers
but it doesn't matter all that much, the point i wanted to make is that the fact a flap plate has a large wake is an advantage, as you can have a smaller dam send the air around the larger tire behind it. but if you make it to wide you may actually add drag.