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  #1  
Old 02-24-2013, 11:17 AM
543TB 543TB is offline
 
Join Date: Dec 2011
Location: Denver, CO
Posts: 74
Default Strange crack in skin. Why would this happen?

Okay, friends. We've been building for awhile, and completed the leading edge (outboard) section on the left wing back in November. While out in the garage this week, we noticed what appears to be a crack in the skin, top-side, right along the rivet line where the bracket for the stall warning assembly lies. As you can see, however, the crack does not extend to the rivet hole. Why on earth would this occur, and what can be done about it? (We are sending Van's the same question, but wondering what the collective knowledge of the Van's-verse would say.)



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  #2  
Old 02-24-2013, 12:16 PM
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curtis curtis is offline
 
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Location: Kansas
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Default

Is this a crack or is it something that has been smashed onto the skin during riveting?
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  #3  
Old 02-24-2013, 02:17 PM
543TB 543TB is offline
 
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Quote:
Originally Posted by curtis View Post
Is this a crack or is it something that has been smashed onto the skin during riveting?
It appears to be a small stress crack, but the weird thing is that it didn't show up until recently. It was definitely not there when and right after we installed the stall warning kit, and it isn't raised, which would indicate something between the skin and bracket. The wing has been on the stand the whole winter, and there is no damage around it, so it doesn't appear to have had something hit it. I'm mystified by it.
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  #4  
Old 02-24-2013, 03:18 PM
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az_gila az_gila is offline
 
Join Date: Jan 2005
Location: 57AZ - NW Tucson area
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Question

Is it truly a crack?

Could it have been a sliver of something hard getting in the way during dimpling or riveting?
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  #5  
Old 02-24-2013, 03:22 PM
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RV10inOz RV10inOz is offline
 
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Default

Get all that plastic off. If you have been building for a while it may already be a nightmare to remove.

And you can get corrosion growing under it. You are not doing yourself any favours, trust me.
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Old 02-24-2013, 03:39 PM
rgmwa rgmwa is offline
 
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Location: Perth, Western Australia
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Default

It may just be the lighting, but you appear to have creases in the skin.
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  #7  
Old 02-24-2013, 10:23 PM
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RVbySDI RVbySDI is offline
 
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Location: Tuttle, Oklahoma
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Quote:
Originally Posted by RV10inOz View Post
Get all that plastic off. If you have been building for a while it may already be a nightmare to remove.

And you can get corrosion growing under it. You are not doing yourself any favours, trust me.
+1 with this statement! It is hard to tell what the dis coloring is on the plastic but leaving the plastic on the metal for any length of time is not good at all.
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  #8  
Old 02-25-2013, 10:18 AM
Frank Smidler Frank Smidler is offline
 
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Location: Stoughton, WI
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Default Not a crack

I doubt it is a crack. A crack can only be formed by repetative or extreme bending of the metal. Since this is a new assembly that has not seen either of these it is most likely a scratch or coining from debris when riveting. You can burnish most of this out if you want to with a scotch bright pad. I would not worrie about it though. Work towards good quality not perfect quality. The latter will never result in a finished airplane.
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  #9  
Old 02-25-2013, 10:26 AM
TerryWighs TerryWighs is offline
 
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Location: Fairbanks, Alaska
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Default

There may be a "drill shaving" contaminate under the skin that is sandwiched under the skin, between skin and rib.
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  #10  
Old 02-25-2013, 10:54 AM
pa38112 pa38112 is offline
 
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Do you have kids/wife ? Never underestimate their ability to damage something in a way you could not ever imagine - and then deny it no matter how much supporting evidence you have. Most of the time they don?t even realize or remember what the did.
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