Epic-o wrote:
Carl, can you comment on why did you sum both positive and negative yaw values in the yaw angle histograms.
simplification for publishing purposes.
Epic-o wrote:
For the untrained people, an average yaw of 10.6 degrees could mean that pre-stall drag is much more important that what it really is for the overall aerodynamic performance of the bike.
this is, I believe, what TomA was trying to get at over in the P5 data thread as well. we agree that calling out an average value, time-weighted or otherwise, isn't necessarily the best way to go about things, but it does seem to resonate with more people than not...right now...until everyone gets up to the TomA/Epic-o/everyotherSTaeroguru level
Epic-o wrote:
Moreover, I'm pretty sure that there is a degree of asymmetry in those yaw histograms and some design choices can be affected by it. For example, the BB fillet would be more beneficial with NDS apparent wind speeds
indeed, there is some asymmetry, and in our custom race simulation software (team only) we incorporate it...both the real world and tunnel asymmetry. an extreme example of justifying tube shape/orientation decisions on the basis of that asymmetry might be the QR CD0.1 and Illicito. of course, then you have to explain away how bad the performance is when the wind is coming from the other side...
Carl Matson