Aluminum spar cap-single or double row of fasteners

[JDub]

This would be specifically for a strut braced wing. What would be the difference between a single row and a double row of rivets inside the strut attach (half-span) on the spar caps? Would a double row weaken the spar if the pitch was 5/8" spacing vice a single row at 1.25" spacing (pics show the single row outboard the strut attach and double rows inboard the strut attach).

Spar caps are 1.5X1.5X.125 2024T3, web is .032 2024T3, and the skins and ribs ar .032 6061T6. Is there a reference I could find this in?

JDub

 

[Marc Bourget]

 

[Autodidact]

 

[BBerson]

 

[Matt G.]

 

[JDub]

 

[Mad MAC]

 

[BBerson]

 

[Mad MAC]