Right in the middle of DWG 14a, it shows that QB wing "assemblers" should use a CR3212-4-6 Cherry on the W721 flap brace bracket at the spar root end. That is a flush cherry and I can't figure out why that should be a flush rivet. Why countersink the flap brace at all? Why not just use a normal CR3213-4-6 470 style rivet? Even on DWG 10a (attahced) where it shows the callout for slo build wings, it calls for a 470 and not a 426? So why would they say use a flush cherry instead of a normal 470? See Detail C attached.
I just hate the idea of countersinking the flap brace if you don't need to but Vans usually has a reason for everything they say to do?
Along the same lines, it shows the upper(lower) rivet on the aileron attach bracket is a 426 and I don't see anything that can come close to it for a clearance issue? Why us a 426 here instead of a 470? See Detail B attached
I must be missing something? Any insight here would be appreciated?
Thanks Bill S
7a only the wings left
I just hate the idea of countersinking the flap brace if you don't need to but Vans usually has a reason for everything they say to do?
Along the same lines, it shows the upper(lower) rivet on the aileron attach bracket is a 426 and I don't see anything that can come close to it for a clearance issue? Why us a 426 here instead of a 470? See Detail B attached
I must be missing something? Any insight here would be appreciated?
Thanks Bill S
7a only the wings left
