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  #1  
Old 11-13-2012, 08:23 PM
localizer localizer is offline
 
Join Date: Aug 2012
Location: Greenville, SC
Posts: 50
Default Undimpling, or whatever it is called

Hi all,
I was working on a training project this evening and was so happy to see results that I have immediately screwed up. I dimpled stiffeners in the wrong direction.
When i realized that I turned the stiffeners upside down and dimpled the holes in the right direction.
Question: is that OK to this on an airplane, or is the part destroyed and I should order a replacement?

Thanks!
Yuri
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  #2  
Old 11-13-2012, 08:37 PM
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Don Patrick Don Patrick is offline
 
Join Date: Feb 2010
Location: GTA, Ontario
Posts: 857
Default Cha ching!

I had a friend who did that on his -8 empennage. He reversed the dimple the proper way and had a hole the size of the dimple in his skin.

Fortunately it was on the training project. Not an engineer, but I think it's safe to say the metal will fail and result in a hole.

At that point, your buying a new piece, unless you get into doublers and such.

Cheers,

Don
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  #3  
Old 11-13-2012, 08:38 PM
AeroDog AeroDog is offline
 
Join Date: Aug 2011
Location: New London, NC (near Charlotte), Longmont, CO
Posts: 286
Default

Quote:
Originally Posted by localizer View Post
Hi all,
I was working on a training project this evening and was so happy to see results that I have immediately screwed up. I dimpled stiffeners in the wrong direction.
When i realized that I turned the stiffeners upside down and dimpled the holes in the right direction.
Question: is that OK to this on an airplane, or is the part destroyed and I should order a replacement?

Thanks!
Yuri
I've undimpled a few. I suppose it depends on which part it is.

Jerre
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  #4  
Old 11-13-2012, 08:38 PM
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airguy airguy is offline
 
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Location: Garden City, Tx
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Default

General consensus of opinion is that you can do that ONCE. If you then realize the first dimple was correct, now you get to buy a new part.
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  #5  
Old 11-14-2012, 03:56 AM
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Nihon_Ni Nihon_Ni is offline
 
Join Date: Jun 2011
Location: Fredericksburg, VA
Posts: 351
Default

Call Van's builder support. They have much better information than the opinions you'll find here.
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  #6  
Old 11-14-2012, 11:50 AM
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ppilotmike ppilotmike is offline
 
Join Date: Jan 2010
Location: Denver, CO
Posts: 1,991
Default +1 to Greg's comment...

I have also been told, at a Sportair Workshop Class, that you may flatten and dimple the other direction only once. I have had to do this to only 2 holes so far on my 10 build. IMHO, if I had a whole line of dimpled holes dimpled the wrong way, I'd consider replacing the part. Whether I did or didn't would be based on what the part was doing in the structure, a call to Vans, my own gut, etc.... My $0.02.
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  #7  
Old 11-14-2012, 12:14 PM
eison eison is offline
 
Join Date: Jul 2007
Location: Irvine, CA
Posts: 28
Default Been there done that

I can't remember the part, but it was one where just replacing it wasn't going to be easy. I called Van's because I was going to try and engineer a solution using the dimple headed the different direction. They laughed and said "just dimple it the other way". Problem solved. Build on.
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  #8  
Old 11-14-2012, 02:24 PM
localizer localizer is offline
 
Join Date: Aug 2012
Location: Greenville, SC
Posts: 50
Default

Thank you all for responses.
I have also talked to Vans. Their response:
"This is not a problem in most areas and is a common practice if dimples are put in the wrong way. If you do this it is not a bad idea to inspect after you correct the problem for cracks."
So I will do just that.
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