BikeTechReview wrote:
Jim@EROsports wrote:
The numbers that jump out at me right away are the power v. CdA. Clearly, he hit his lowest CdA's when he dropped his output a bit. Not surprising at all as he was probably more relaxed during those laps. Rider tension can be a CdA killer, and all the riders at IMAZ were battling a vicious headwind which had to take it's toll on their drag numbers. Andy averaged 237 watts, so that likely changed his CdA, and it's probably safe to assume it wasn't in a good way!
...just adding some
screenshot data here that is relevant to this comment from a group using the same system as used in Carson (Track Aero System v 1.37):
the middle panel appears to be power, the bottom panel appears to be CxA. These data seem to suggest that higher power equates to lower CxA.
Without knowledge of the context, it could mean all sorts of things or it might mean nothing. All the twitter link says is it's an example of live data being recorded. It says nothing about what was going on.
It may simply have been a rider riding around the track with no specific instruction. Perhaps the rider started out sitting up a bit before beginning a harder efforts and changing bike position.Maybe there was another rider on track and this was just looking at one rider's data while riding around. Perhaps that was simply a demo of the real time wireless data capture system and wasn't related to specific aero testing protocols. Maybe it was just a demo/teching/learning exercise. Who knows? The tech is used for more than just aero testing, although that's its best known application.
It's a bit of a stretch to come to any conclusion about that screen shot without context of what was going on while that data was being recorded.