Originally Posted by
spectastic
what bugs me is that some of these graphs aren't consistent at opposite yaw angles. the graph should be symmetric with respect to the y-axis, should it not? the only thing that's not symmetrical on a bike is the drivetrain and the disc rotors. or maybe it's the test environment that causes the right side to experience more drag. the error bars also look like they're based on some margin of error calculation, and not based on empirical data. I would like to see a more detailed description on how they obtained this data.
In general, I'm not a huge fan of that article I posted. Lacks a lot of the info needed to draw the conclusions they do.
To address your point on assymetric data, that tends to be the trend, having looked at a few graphs from different groups. (
Aeroweenie.com - Aero Data Compendium) Not sure the cause, just a trend I've noticed. Wish I understood more.