Today I worked on the tip ribs. I had previously removed the leading edge skin. First, with the ribs attached, I up drilled the #40 holes to #33 on the top flange. Next I used my modified dimple dies in my squeezed to dimple the holes. Afterwards I started removing the ribs one at a time and up drilling the remaining holes on the bottom flange and dimpling them.
Welcome to my builders log for Sonex S/N 767. It won't be as big as a real 767 but if you scale the speed I bet it will be almost as fast
Dave's Sonex Builders Log 