[samstave]

I'm really interested in how dimpling would affect the drag/lift properties of these.

Years ago on /. I saw a post about how wales bumps on the leading edges of their fins/flippers were to increase/modify the eddies around their fins in such a way as to provide them more thrust (or something, it's been years since I read the article) - and I was curious what it would look like to have helicopter blades with leading edge bumps on them similar to wales...

So, I'd like to see what dimples both convex and concave would have on the surfaces if these - like a golf ball.

Also, if you have never done it, take a cylindrical plastic cup and, in a bathtub full of water spin the cup as hard as you can on the surface of the water - like a top - and see how long you can get it to stand up. Kids like this trick.

I always thought it would be interesting to have a barge like flat boat on top of several cylindrical feet like floats, which can spin rapidly along the Z access and use it as thrust.

[antoncohen]

Mythbusters tested golf ball like dimples on a car, and apparently is help fuel economy.

https://www.autoblog.com/2009/10/22/mythbusters-golf-ball-li...