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Most of the things I've seen dimples on are objects that spin, or don't really have a front. I haven't seen a dimpled helmet, but I know the last street bike helmet I bought, shoei claimed to of done work to try to neutralize changes in lift and drag depending on the direction you're looking. So even though it clearly has a front, I could see dimpling tring to minimize the effects.
Do you have examples of dimpling used on hulls?
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