Scary!! Strangely enough, I have been fluting my wing ribs and this is the EXACT same method that occurred to me.
Couple of things to note. Firstly (on the -10 at least) the bottom profile is less curved than the top so needs less fluting - took me a couple of ribs to work that one out. Secondly, after fluting the flanges bend out again slightly and need to be hand-seamed back to square again.
Must be a million different ways to do these things. Anyway, 20 down, 10 to go..........
Mercy Air, White River FAWV
RV-10 ZU-IIZ - "Zeus"
Building Bearhawk Bravo - RV-18 not available
2019 Donation Made