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Rudder: Oil canning

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kellerds

Joined: 14 Dec 2007
Posts: 3

Posted: Wed Aug 13, 2008 10:27 am Post subject: Rudder: Oil canning

Hi -



Last night, while final drilling my rudder, I noticed some oil canning in the bottom two panels of the left skin. I had been following the plans, so was a bit surprised to see it. It was what I would consider to be fairly significant oil canning (only comparison is to my old Cessna 170, which had that going in a few spots), where if I pushed on one panel, the next one up would pop. 

 

My question is whether this is something that will work itself out during riveting or whether there is a strategy for redrilling (or something) to deal with it before I begin riveting?



I've seen some really good archived messages about specific rivet patterns being used to alleviate oil canning, but none that directly apply to the rudder. Should I just not worry about it and have faith that the riveting process will equalize the tension irregularities?

 

Thanks,



Dennis Keller

Albany, CA

http://www.n44dk.com



  [quote][b]

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bbreckenridge(at)gmail.co
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Posted: Wed Aug 13, 2008 10:42 am Post subject: Rudder: Oil canning

Dennis;

  

 I've found pretty good luck with using a ton of clecos.  I use the scatter method - one here, one way over there, etc.  This seems to help keep canning to a minimum.  I would pull out all the clecos and re-cleco it to see if the problem persists.

   

 Bruce

 flaps

 On Wed, Aug 13, 2008 at 11:23 AM, Dennis Keller <dennis(at)bullamanka.com (dennis(at)bullamanka.com)> wrote:

 [quote] Hi -



Last night, while final drilling my rudder, I noticed some oil canning in the bottom two panels of the left skin. I had been following the plans, so was a bit surprised to see it. It was what I would consider to be fairly significant oil canning (only comparison is to my old Cessna 170, which had that going in a few spots), where if I pushed on one panel, the next one up would pop. 

 

My question is whether this is something that will work itself out during riveting or whether there is a strategy for redrilling (or something) to deal with it before I begin riveting?



I've seen some really good archived messages about specific rivet patterns being used to alleviate oil canning, but none that directly apply to the rudder. Should I just not worry about it and have faith that the riveting process will equalize the tension irregularities?

 

Thanks,



Dennis Keller

Albany, CA

http://www.n44dk.com



 	  Quote: 	
		  

	
[b]

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John Kirkland

Joined: 13 Jan 2006
Posts: 19
Location: South Weber, UT

Posted: Fri Aug 15, 2008 12:39 pm Post subject: Re: Rudder: Oil canning

A general rule of thumb that helps keep the metal work tight is to start riveting in the middle and work towards the ends/corners.

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