Reducing Drag

In the field of Aerospace, research in drag reduction mechanisms has been almost saturated. ny what i was saying, that when you try to insert a nail in you wall you have to put a lots of pressure by hammer, but if you take a nail having rings around it, and use a skrewdriver then you dont need to put that much ammount of force.
so mine observation says that a complete rotating structure having circular grooves over it would face less drag then the stright case.
May be its not applicable for the less viscous materials but for the viscousity its for sure true.
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