Originally Posted by nigelspeedy
I tried VGs on my RV-8 on the outboard wing leading edge i.e. in front of the ailerons. They made no difference to the stick buffeting that you are talking about or the roll rate under any configuration.
What about VGs on the wing, but located just forward of the aileron hingeline (instead of the wing leading edge)? But since the buffet we are talking about occurs at large aileron deflections, that may not work either.
There are some large airplanes I'm familiar with that have VGs just ahead of the aileron hingeline to preclude buffet due to flow separation over the aileron under certain conditions. But those conditions usually don't involve large aileron deflections.
I should add that I don't think this aileron buffet is an issue that needs a fix on the RVs.