[donee]

Hi All,

This aerodynmic problem has been solved - kinda. Think frisbee and the successors to it.

So, do not dimple the flush hub caps, but put a little lip around the outer edge.

See: Aerobie® Flying Rings: Scientific Paper by Alan Adler, Inventor

Even Frisbee's have a rough set of ridges (also for grip) at the seperation points of the air-foil. But no dimples.