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That helmet doesn't sport big fins sticking up out of it, and supports my theory that you can trip the boundary layer sufficiently without sticking up past it.
People on this site that have experimented with VG's have talked about noise, and I think that if you're creating enough drag to generate that much sound over background noise that it's probably too much. I doubt that the ridges in that helmet created very much noise - they may very well have quieted some noise - and when you are wearing something over your entire head you can tell.
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