Winglets and bumpy paint?

[kitcar]

Winglets:

Has anyone experimented with winglets in front of wheel well openings? Using my hand propane torch and some vinyl, I've formed winglets.

Since I have to drill visible holes to mount them, I thought I'd try to get some actual data before I start drilling holes willy-nilly.

Bumpy paint:

I cover a lot of air shows. In the mid '80s, I was able to get up close and personal with a MIG-29, the Russian F-15 clone. Now, these things can go mach 2 but the Russkies had a problem. They can't build a quality aircraft skin to save their lives. So they came up with a unique approach to allow the plane to slip through the air. Bumpy paint. A urethane coating that looks like it has large grains of sand in it was applied before the paint to create a "zone" of separation between the poor fitting panels and the air stream. I was able to have a conversation with the designer who was touring with the aircraft(s) around the United States who was somewhat forthcoming with the information after being plied with some compliments about the MIGs. Photos of MIG attached; note bullet holes in tail.

Just a thought.