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oil canning.

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indigoonlatigo(at)msn.com
Guest

Posted: Sat Dec 15, 2007 9:48 pm Post subject: oil canning.

I remember reading a post a few weeks ago about this but I don't recal the location of the problem

  

 I closed up the bottom of one wing today and I am quite surprised to find so much oil canning on the skins just aft of the main spar. I used clecos in every hole and I followed the directions, starting from the location indicated and moving forward and inward and outward at the same time. Aside from a few blemishes, I thought I had done a fairly good job, but compared to what the rest of the quickbuild wing looks like, I would say I am missing some thing.

  

 I will say that after I got the J channel rivetted and the aft portions of the ribs completed, I rivetted the skin at the main spar, as I was worried that if I kept working forward I would prevent the skin from laying flat on the spar and it might get hung up on the edge of the forward(L.E.) skin. 

  

 Any body want to admit to having a similar finding.

  

 Thanks

  

 JOhn G. 409

  [quote][b]

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ron.mcgann(at)baesystems.
Guest

Posted: Sat Dec 15, 2007 11:06 pm Post subject: oil canning.

Hey John,



Previous post was probably from me.  I had oil canning in the VS and rudder.  Tore down and rebuilt the VS - it is now much better.  Oil canning in the rudder was due to not enough bend applied to the leading edge which places too much stress on the skins behind the spar.  Removed the LP4-3s and reformed by hand and re-rivetted.  Only a small oil can in one panel now.  This is a lesson for those about to build their rudder - once initially formed, the bend is quite easy to finish by hand forming.  Do not try and pull the skins together with clecoes and then rivet.  Oil canning will result.



I rivetted my bottom wing skins solo.  One panel oil cans aft of the main spar (midway between the outboard inspection holes). The rest are tight as a drum.  I noticed the skins tighten a fair bit as I neared the end of the rivetting sequence per plans. 



cheers

Ron



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johngoodman

Joined: 18 Sep 2006
Posts: 530
Location: GA

Posted: Sun Dec 16, 2007 5:47 pm Post subject: Re: oil canning.

JOhn,

You got my attention. I'll be closing up my QB wings in a week or two and I've noticed a little "slop" in the open ribs, especially in the middle, when I tried to precut the pitot mount hole. I'm guessing about two bays outside the last inspection port, right?

John

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_________________
#40572 Phase One complete in 2011

indigoonlatigo(at)msn.com
Guest

Posted: Sun Dec 16, 2007 6:39 pm Post subject: oil canning.

Thanks Ron,

  

 I had completed last night the rivetting of the bottom wing skin completing step 11, section 20-5. As I stated, I noted the large amount of oil canning in the squares aft of the main spar and I stopped. This morning I removed the rivets that are forward of the J stiffner, all the way to the spar and the skin released with no seen tweeks. 

  

 What I am having trouble understanding is that eventhough the rib flanges have been crimped, the ribs seem to be loaded with pressure and they need to be pulled into alignment with the skin holes. These pr loads seem to be what is causing the oil canning.

  

 Studing the ribs without the skin indicates that the pulling force each rib exerts is in the opposite direction from the direction the flange is facing. Where the plans have us start is the centerpoint where both rib's pulling forces are coming together, directed toward one another(which means loose skin). Perhaps if I would have proceeded the skin may have gotten tighter toward the completion of step 12, as you suggested, but I was reluctant to proceed. 

  

 Step 11 really doesn't spell out the order too well in how to rivet the skin to the underlying structure. It says nothing about how to proceed forward of the J stiffner. I presume the entire J stiffner needs to be rivetted prior to moving forward toward the main spar, no clecos forward of the J stiffner, this allows us to get our hand up under the skin to access the J stiffner. After it is rivetted, I presume we need to cleco the remaining structure closed and access the interior from the access holes.

  

 Sorry for the long post just don't want to have to drill these rivets out again.

  

 I seems so strange building structures which have these preloads on them and then asking another preloaded member to cancel the other out. I seem to never get over this and how we are using controlled collisions to build structure. Next plane will be fiberglass.

  

 Thanks for any suggestions other than quiting,

  

 JOhn G.

  [quote][b]

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dlm46007(at)cox.net
Guest

Posted: Sun Dec 16, 2007 7:54 pm Post subject: oil canning.

When you are joining adjacent skins you should trim the edge so that there

is about a .020 gap when clecoed in place; this will allow the riveted skin

to expand to fill the gap. If the skins fit tightly before riveting there

will be excess metal to oil can. You can also see the ridge where the skins

join. Addtionally you can cleco the skin every other hole and lock the skin

in place before making a second pass and finishing the job. 



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indigoonlatigo(at)msn.com
Guest

Posted: Mon Dec 17, 2007 9:07 am Post subject: oil canning.

I'll send you a few photos in a while. Tried to do it over the matronics page but the photo size is too large for even one on my photos. Two attempts.

  

 It is actually the bay just inboard of the last access panel as described in the manual.

  

 John

  

 Do Not archive



 	  Quote: 	
		   Subject: Re: oil canning.

 From: johngoodman(at)earthlink.net

 Date: Sun, 16 Dec 2007 17:47:36 -0800

 To: rv10-list(at)matronics.com

 

 --> RV10-List message posted by: "johngoodman" <johngoodman(at)earthlink.net>

 

 JOhn,

 You got my attention. I'll be closing up my QB wings in a week or two and I've noticed a little "slop" in the open ribs, especially in the middle, when I tried to precut the pitot mount hole. I'm guessing about two bays outside the last inspection port, right?

 John

 

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 #40572 QB Wings, QB Fuse arrived

 N711JG reserved

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=152605#152605

 

 

 

 

 

 

 

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