WD-409 / F-712 assembly question

[mototopo]

I'm working on the rear fuselage and I have a few questions:

1. Where are to be located the keeper rivets on WD-409/F-712? The measure shown on DWG27 view A-A take as reference the lower row of rivets on the VS hinge, but, obviously, I have still not installed it... so....where to measure from? Am I misreading the plans? Maybe the location is not critical so I can just install them somewhere...

2. Keeper rivets are AN426 with flush head on the rear side. This means I have to countersink the F-712 bulkhead (I don't think is possible to dimple the WD-409). Being not structural, may I use ooops rivets to reduce the amount of required countersink?

3. I removed the stickers with the part# from the F-712A and B bulkeads. I have marked them, but now I'm not sure I did it correctly. Can someone confirm me that the rear bulkead (F-712B) is the one WITHOUT the prepunched holes on the flanges? (it looks so on the plans but I just want to be sure)

I'm having an hard time obtaining a good fit between F-712, F-711 and F-779... any suggestion is welcome!

 

[Rainmaker]

I don't have the plans in front of me but if I remember this was a "get it close" interpretation of the drawings. I don't think the position is critical as long as you keep the rivets away from where bolt holes get drilled and far enough away from the edge of the weldment.

 

[DrHolling]

Your signature indicates an RV-7A; if that is correct you should be working from Dwg. 27A. You will not have a WD-409 for the 7A.

Yes it is very difficult to get a good fit on those 3 pieces but perseverance will pay off. Work at making the bend of the F-712 flanges nice and crisp. If they are rounded it is more difficult to get the holes to line up with the F-779

You are correct, the F-712B is the one without holes.

Dave

 

[mototopo]

I started the project as a trigear then switched to TD...just edited the signature

Thanks for the advice