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I don't know the exact rules, but I do know that helmet shapes have been very controversial in other events, especially skiing and cycling. Apparently, once you figure out the placement of VG's or boattails, then all you have to do is mold the helmet to incorporate those shapes into the structure so that they are not just "stick-ons". Speed skiing and time-trial cycling have seen some pretty radical shapes - much moreso than the little ridges on Amy's helmet. Open cockpit car racing has had some weird looking VG's on drivers helmets, but this has been more to reduce buffeting than to increase speed.
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