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About 22% of what it is at 50km.h-1. It's not quite that simple because the numbers in the table are a weighted average over a range of yaw angles appropriate to an elite TTer doing 50km.h-1, the weighting would be different if you were only doing 30km.h-1 because a given amount of crosswind would give a higher yaw angle.
Ah ha, I hadn't thought about it being a cube; that's not nearly as scary! Because I'm bad at maths/lazy, can you tell me what the drag would be from Ksyriums at 30km/h?