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@gbj_tester
Golf ball dimples aren't there because the ball is spinning, they are there because they delay the flow separation. They only have to be all over the surface because you never know what the orientation of the ball will be. On a sphere which is constrained from rotation (e.g. a motorcycle helmet) you can achieve the same gain by adding a trip at the right place, without the losses you get from roughening the whole surface of a golf ball.