Originally Posted by salto
Plans call for countersinks in wing walkway area. I dimpled my inboard ribs so I dimpled the support skin and wing skin as well. Still worked out a neat job and is probably stronger due to the inherent strengthening dimpled skins provide.
+1 vote for dimpling instead of countersinking. I dimpled the wing walks on my RV-8A and had no issues. I got my -14 wings partially assembled by the original builder and the wing walk area had been countersunk per the plans and looked awful. I'm not just talking about aesthetics (it will be covered by the non-skid material) but a lot of the holes were elongated, rivet heads too deep or too shallow or cocked at an angle, etc. I finally drilled out the inboard wing skins and replaced with new skins, wing walk doublers, and inboard ribs. Dimpled everything and they look way better and will be stronger with less likelihood of fretting rivets as the years go by.
My personal rule is to always dimple instead of countersinking wherever possible. I also dimpled the rear tank baffle on the -14. Looks way better than the countersunk rivets on the baffles of my -8A. Assembly was super easy and no leaks in either tank.