Had the same question.
See DWG 19 for rivet sizes.
One important thing (countersinking or dimpling spar holes):
Me: "I don't understand the rivet size (length) call outs.
Using a -3.5 to rivet .025 skin to 0.040 spar flange is OK. (0.025 + 0.040 + 1.5 x 3/32) x 16 = 3.29
But using a -4 to rivet .025 skin to .025 or .032 ribs. Why??"
Vans: "The difference between these is the way the components are prepped to accept the rivets in question. The skin to rib attachments would have both the rib and the skin dimpled where the skin to spar would have the skin dimpled and the spar countersunk. Some builders will choose to dimple the spar which would require a longer rivet be used. The illustration below may help you understand the difference.
In the end if a rivet does not seem to be correct it is easy to place one in a hole and measure the protruding tail to confirm if it is either correct or if you should make adjustments."
Originally Posted by RyanB
On the wing plan it shows that for the wing skin rivet pattern we should refer to SK-31,32,33,34,35,36 and 37.
Any idea what SK stands for and where we can find these drawing or diagrams?
Iím probably missing something here
Thanks in advance