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Bottom Longeron Question

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bradfnp(at)msn.com
Guest

Posted: Tue Dec 04, 2007 6:37 pm Post subject: Bottom Longeron Question

I am finally getting to work on the Fuselage of my 601XL and I am trying not 

to repeat dumb a** mistakes that I have made thus far so I figured I had 

better ask;



I have the standard kit (not quickbuild) and I am fitting the bottom 

longeron 6B2-3 to the rear longeron 6B2-1. It appears that I will have to 

trim about 150mm of overhang from the rear longeron and about 50mm from the 

back of the bottom longeron where the splice of the two will occur, since 

the front of the longeron is already bent to match the curvature of the 

skin. Does this ring any bells with those of you already past htis point? I 

am really hesitant to go cutting without confirmation.



Thanks

Brad Cohen

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PatrickW

Joined: 27 Oct 2006
Posts: 380
Location: Fort Worth, Texas

Posted: Tue Dec 04, 2007 8:09 pm Post subject: Re: Bottom Longeron Question

We are about at the same stage.  I just wondered about that same thing a couple days ago.



Here's what I did:



I took my bottom skin and laid it flat on my workbench.  Then I took the pre-bent extrusion and "matched it up" at the point where the bend in the extrusion exactly matched the curvature of the pre-drilled bottom skin (yes, there was some extra extrusion over the front, and some more extra angle off the back.  I did the splice too, and it was right where it was supposed to be).



Then I clamped it all in place and gently slid the whole works until the rivet line was overhanging my workbench.



Then I took a sharpie marker and marked through every single pilot hole - putting a dot where I was going to drill every hole.  I did this "on my back", upside down, looking up from beneath the skin.  I figured it's easier to mark holes and correct if needed, than to drill holes and then slap myself for screwing up.



Then I unclamped and took it apart and looked at where all the dots were (on the longerons).  They all looked good, so I put everything back together and checked that I could see the dots through the pilot holes, so I knew I had everything aligned.  Then I drilled & cleco'd.



Worked for me.  I was extra careful here, and it came out well, as far as I can tell right now.



Good luck!



Patrick

XL/Corvair

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Kevin Bonds

Joined: 09 Jan 2006
Posts: 171
Location: Nashville, Tn

Posted: Wed Dec 05, 2007 12:17 pm Post subject: Bottom Longeron Question

Brad



When you get to the point of drilling those longerons together along with

the doubler, pay close attention to your edge distance and distance to the

bend. My holes are a little close to the bend inside the doubler on account

of the height of the stack. Wish I would have spent a little more time

analyzing this before I drilled. Becomes kind of a tight squeeze because the

side of the extruded L is short. Better to be close to the bend than to the

edge I reckon though.



Kevin Bonds



Nashville TN

601XL Plans building.

http://home.comcast.net/~kevinbonds



 



 

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_________________
KevinBonds
Nashville, TN
Plans-building Zenith CH601XL w/Corvair Power
http://home.comcast.net/~kevinbonds

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