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  #1  
Old 05-01-2019, 04:51 AM
RyanB RyanB is offline
 
Join Date: Sep 2017
Location: South Africa
Posts: 64
Default Longeron to bulkhead attach

Hi Everyone

So we are finishing up the skeleton of the fuselage and have clamped all the longerons and stringers to the bulkheads. Now obviously before we can lay the skins on we will need to remove the clamps, so how do we now hold the longerons and stringers to the bulkheads whilst drilling the skins?

I thought of predrilling the longerons and stringers to the bulkheads and clecoing then on, but the clecos would also have to be removed before the skin laid on, so it won’t work either.

Should I attach an angle between the longeron and bulkheads and rivet it on?

Hope this makes sense, thank you
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  #2  
Old 05-01-2019, 09:04 AM
fixnflyguy fixnflyguy is online now
 
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Location: Winston-Salem, N.C.
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Default What I did..

I know when I built mine, I drilled the bulkhead/stringer fastener holes,then installed small pop rivets in a few locations to hold the stringers in place and drilled up the skin panels, then removed the pop rivets and and back-drilled the skin at that location later on. The -4's and -6's took some forethought to build!
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  #3  
Old 05-01-2019, 09:23 AM
sjhurlbut sjhurlbut is offline
 
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Posts: 635
Default rivets

Every 10 or 20 rivets add another hole between 2 rivets. Debur it and countersink it. Rivet longeron in place using these holes to secure it then put the skin on. You can predrill the longeron and then drill from inside but its a very tight fit in there. I did it on my fastback RV8 which had the top skin not prepunched. Was fine until you get right down in tail cone.
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  #4  
Old 05-01-2019, 09:50 AM
DeeCee 57's Avatar
DeeCee 57 DeeCee 57 is offline
 
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Location: Zürich W, Switzerland, Europe, Earth, Milky Way, known Universe...
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clamping and using angles... riveting starts with the bottom rear skin to move forward, then the side skins follow. A couple of pictures showing the built at the end of my foto library, hope it is of help.

https://drive.google.com/drive/mobil...BjnALbl5jqrp3x
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RV-4 #2062 HB-YVZ airframe builder
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Last edited by DeeCee 57 : 05-01-2019 at 09:52 AM.
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  #5  
Old 05-01-2019, 10:30 AM
RyanB RyanB is offline
 
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Default Thank you

Guys thank you so so much for the brilliant replies!! Not sure what I would do without this site
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  #6  
Old 05-01-2019, 10:33 AM
RyanB RyanB is offline
 
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Location: South Africa
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DC why have I not known about your pics already

Going to be such an asset for me going forward
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  #7  
Old 05-01-2019, 11:30 AM
DeeCee 57's Avatar
DeeCee 57 DeeCee 57 is offline
 
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pleasure Ryan, old stuff and lo quality picts of picts but all for free
Friend Marcel finished the -4 a few years later, his more recent pictures of engine and electrical install are here https://photos.google.com/share/AF1Q...Y4MDJuVndVUG9R
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http://www.aerofun.ch

RV-4 #2062 HB-YVZ airframe builder
RV-6 #25685, slider, O-360-A3A (carb/dual Lightspeed II), MTV-12-B, HB-YLL owner
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  #8  
Old 05-01-2019, 11:56 AM
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az_gila az_gila is offline
 
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Location: 57AZ - NW Tucson area
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Put a rivet at the intersection of the bulkhead and stringers. Then simply space your rivets so they miss the intersection when you add the skin on.

Along the longeron add rivets every 3 or 4 spaces in between the final skin rivets on the lower skin.

Make sure you place a straight edge alongside the bulkheads, the early plans had some errors in the bulkhead spacing.

That is how I did my -6A.
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Last edited by az_gila : 05-01-2019 at 06:11 PM.
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  #9  
Old 05-01-2019, 03:15 PM
RyanB RyanB is offline
 
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Thank you Gill
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