[Iluke]

This weekend I came across one of those times where it seemed obvious that I should depart from the plans. Building the flaps (RV-7), and drawing 14A Section C-C clearly calls for pop rivets (LP 4-3s) for joining the ribs and the spar. That makes sense for the inboard end rib and all the interior ribs, there's no way to buck rivets there, but not for the outboard end rib, FL 704. That joint is wide open top and bottom. I couldn't see any rationale for not using driven rivets, so that's what I did. See pictures below.

Did I miss something, or is this just one of those things?

 

[aeroaddict]

I'd be careful, the CFD model indicates that the load across the -703 spar and ribs must be evenly distributed and have the same fastener load or catastrophic failure could occur.

But that's what I did on my flaps.

Cheers

 

[Iluke]

I'd be careful, the CFD model indicates that the load across the -703 spar and ribs must be evenly distributed and have the same fastener load or catastrophic failure could occur.

But that's what I did on my flaps.

Cheers

I'm not familiar with the CFD model. Could you explain?

 

[krw5927]

I'm not familiar with the CFD model. Could you explain?

CFD = Computational Fluid Dynamics.

But Dan was just being silly. You made a good choice going with the solid rivets. Carry on.

 

[aeroaddict]

Sorry Ivan, I stepped out to do errands and then went to the movies. But Kurt is correct, just some humor. Nice job on the rivet selection.

 

[Iluke]

Sorry Ivan, I stepped out to do errands and then went to the movies. But Kurt is correct, just some humor. Nice job on the rivet selection.

No problem! You did have me going there for a moment!

 

[Charles in SC]

My quick build had solid rivets there so they must be ok.