Originally Posted by
RChung
[Edit 2:] BTW, that same guy affixed a flat 5cm x 5cm plate to his bike and tried to estimate the difference in estimated drag. He estimated the difference in CdA at .003 m^2. The area was 5cm x 5cm = .0025 m^2, but the Cd of a flat plate isn't 1.0. Go look it up and figure out what the CdA of a 5cm flat plate ought to be.
Found this kind of interesting. Why do you think the CdA of a flat plate, with material behind it (like a headtube, or handlebar) has the same CdA of flat plate by itself? Also, you're losing a bit of that accuracy you touted earlier.