Upper cross ties to longeron

[Bryan Cotton]

Hi all,
Where the upper cross ties meet the longeron there is supposed to be two rivets on each part. There is about a .060 gap between the upper wide flange and longeron. I am going to shim it. Has anybody else seen this before?

[gammaxy]

I don't understand how you ended up with a 0.060" gap--I believe I clamped my cross ties directly to the longerons when drilling them to the other channels. Am I misunderstanding your question?

This log entry has a picture that shows my cross ties.
http://chrismadsen.org/2012/03/rear-fuselage-parts-and-turtledeck-layout/

[Bryan Cotton]

Chris,
I drilled my longerons even with the edge of the skin a while back. The verticals and crossties are all located by the CNC holes. I suppose I could have moved the longerons down, but then I think they would have been too tight on the forward cross tie box.

[gammaxy]

Yeah, I definitely wouldn't want to adjust the longeron locations. My fuselage was scratch built, so I could just move the verticals and crossties around until everything fit nicely (I wasn't thinking that all your holes were already CNC drilled). The shim sounds like the right way to go to me, but I'd be tempted to just stretch the flange against the longeron if possible and skip the shim. In my mind I was picturing you with a much larger than .060" gap.

[Bryan Cotton]

I thought the same, but the gap remains by the bend of the flange.

[Bryan Cotton]

One of the shims I made was .125". It is like the verticals are too short. Nobody else with matched holes has seen this?

[ScottM-Sonex1629]

Bryan,

I would have to say no joy on this one. I am attaching a picture of mine right after completing the riveting of the lower box portion before I started the turtle deck. Not sure what to tell you other than if you can squeeze the rivets in there, it will probably be fine. It all gets covered up by the number one turtle deck formers.





Scott

[ScottM-Sonex1629]

Bryan,

Can you attach a picture of what you are seeing on yours?

P.S. If you have run out of photo quota try Photobucket or Flicker. It's free online hosting and you copy the "IMG" code line from your photo and paste it in here within your reply. Takes up no space on this forums storage...quick and easy.

[Bryan Cotton]

Scott,
I will get a pic tomorrow.

[Rynoth]

I just checked and did not have this issue... the side panels with the laser cut holes (and longeron flush to skin edge) put everything in the right spot for the upper cross flanges to lay right against the underside of the longeron.

Picture is worth a 1000 words.