In the A2 testing we went to this summer, a round bottle on the seat tube was a 9w hit. I know others where the BTA was a watt saver. Again, it varies. If you look at pic 4, every single person said no way is that going to test fast (BTA sticking up in the wind). Yet it tested fast and faster than the Xlab torpedo that tucked so you could hardly see it.

As the yaw goes out you normally see a reduction., we saw that quite often at A2. If it was better at baseline 19/20 runs it was better at yaw. The velodrome isn't 0 yaw. Jim and Andy can better tell you what yaw it averages out to be, maybe 2-3 is my guess.

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Brian Stover USAT LII
Accelerate3 Coaching
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