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  #1  
Old 10-01-2014, 01:00 AM
seattleworm seattleworm is offline
 
Join Date: Sep 2010
Location: Seattle, WA
Posts: 120
Default Wing Panel Wrinkle

My RV7 got about 70 hours. Last weekend I had a passenger to take some video, and I noticed a obvious wing panel wrinkle. Since I could not see it from left seat without really reach out, I didn't notice this until now. The wrinkle probably has been there from day 1. I checked the wing panel while on the ground, the wrinkle is not obvious, but noticeable when looking hard. When pushing the panel, you can see some sort of oil canning behavior (panel is not very tight). I don't remember seeing this kind wrinkle from other RV videos, it could be just that the light and angle make the wrinkle so obvious. The plane flies really well, and there is no vibration on the panel during flight, so I don't think it will cause any safety problem, but just wonder if anybody noticed something similar. Picture is shown below, you can see the winkle at the bay right after the fuel cap

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  #2  
Old 10-01-2014, 09:44 AM
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PerfTech PerfTech is offline
 
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Location: Redlands, Ca.
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Default

Quote:
Originally Posted by seattleworm View Post
My RV7 got about 70 hours. Last weekend I had a passenger to take some video, and I noticed a obvious wing panel wrinkle. Since I could not see it from left seat without really reach out, I didn't notice this until now. The wrinkle probably has been there from day 1. I checked the wing panel while on the ground, the wrinkle is not obvious, but noticeable when looking hard. When pushing the panel, you can see some sort of oil canning behavior (panel is not very tight). I don't remember seeing this kind wrinkle from other RV videos, it could be just that the light and angle make the wrinkle so obvious. The plane flies really well, and there is no vibration on the panel during flight, so I don't think it will cause any safety problem, but just wonder if anybody noticed something similar. Picture is shown below, you can see the winkle at the bay right after the fuel cap

... This is very normal in flight or if sitting on a set of wing jacks. The first time I saw this I was not happy as well and after pursuing a solution found it was present in most others RV aircraft. When inverted it goes away.
Very nice photo! Thanks, Allan...
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  #3  
Old 10-01-2014, 07:52 PM
Charles in SC Charles in SC is offline
 
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Default

I have flown planes that these wrinkles were much more visible in hot weather than cold.
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  #4  
Old 10-01-2014, 08:52 PM
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BlackhawkSP BlackhawkSP is offline
 
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Location: Indianapolis
Posts: 305
Default Oil Canning

Shawn:

This would not be noticeable on the ground, since the panel in question is probably more in tension. When in the air however, the upper skin is more in a compression condition and then the smallest of variations of excess skin panel verses the rib hole spacing would show up as this oil canning, as it's called.

I have seen Army UH-60 Blackhawk, and CH-47 Chinook, tail booms, and fuselages respectively, severely oil can under stress, when picking up heavy sling loads . When the sun light is just right along the skin, you can see the slightest deviations the height of the skins.
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  #5  
Old 10-01-2014, 11:01 PM
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Infidel Infidel is offline
 
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Smile

Quote:
Originally Posted by RV8JD View Post
Even the best have wrinkles!





Joan Rivers would've argued.
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  #6  
Old 10-02-2014, 01:48 AM
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magiccarpet magiccarpet is offline
 
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Default impressive

Quote:
Originally Posted by RV8JD View Post
Even the best have wrinkles!
awesome images
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  #7  
Old 10-02-2014, 10:13 AM
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mvidalr mvidalr is offline
 
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Location: Monterrey, Mexico
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Default what about paint?

If so....

What causes the paint not to form cracks?
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  #8  
Old 10-02-2014, 11:08 AM
seattleworm seattleworm is offline
 
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Location: Seattle, WA
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Default

Thanks all for confirming this is not something I should worry about. Amazing picture of the B52, wondering what kind temperature is on the skin to get these wrinkles
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  #9  
Old 10-02-2014, 11:42 AM
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Mel Mel is offline
 
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When I skinned my RV-6 wings, I heated them while drilling and riveting. 22 years later they are still drum tight. Of course that was before the kit came with the holes included. That won't help much now. Although heating them while riveting should help some.

The only time I got concerned about wing skin wrinkles was while looping my old Globe Swift. They wrinkled quite a bit during a 3g pull-out.
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  #10  
Old 10-02-2014, 11:49 AM
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Ironflight Ironflight is offline
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Quote:
Originally Posted by Mel View Post
The only time I got concerned about wing skin wrinkles was while looping my old Globe Swift. They wrinkled quite a bit during a 3g pull-out.
Uh....and for future reference (while used airplane shopping), the serial number of that airframe would be....?
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