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If you notice the caption on the bottom of the picture of the A2 at the top of the paper, there is mention of the A2 being introduced at .25 Cd .
This number is often given as the official Cd in published literature ( I've also seen .27 )
This makes me wonder what would have caused such a drastic rise in drag to .288 .
The only visible changes are the style of wheels, and surely this would only account for a count or two .
( And it also makes me wonder if they did the same mods to the .25 version, just how low of a Cd they would have achieved ! )
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