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10-01-2014, 12:00 AM
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Join Date: Sep 2010
Location: Seattle, WA
Posts: 120
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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

__________________
Shawn Li
RV-7-First Flight 5/27/2014
RV-10, Tailcone completed, wings in work
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10-01-2014, 08:44 AM
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Join Date: Sep 2010
Location: Redlands, Ca.
Posts: 1,458
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Quote:
Originally Posted by seattleworm
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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... 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... 
__________________
Allan Nimmo
AntiSplatAero.com
Innovative Aircraft Safety
Products, Tools & ServicesInfo@AntiSplatAero.com Southern California (KREI)
RV-9A / Edge-540 
(909) 824-1020
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10-01-2014, 06:52 PM
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Join Date: Aug 2006
Posts: 703
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I have flown planes that these wrinkles were much more visible in hot weather than cold.
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RV 7
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10-01-2014, 07:52 PM
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Join Date: Jun 2011
Location: Indianapolis
Posts: 228
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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.
__________________

Larry Anderson
Indianapolis
RV-Super 8 N88XT SOLD
RV-10 QB N38LA Flying
Helicopter Instructor Pilot
Standardization I.P.
Instrument Examiner
U.S. Army Retired
EMS Pilot for LifeLine
At IU Health Retired :-)
Although Exempt,
Donated for 2020
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10-01-2014, 10:01 PM
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Join Date: Sep 2011
Location: WV22
Posts: 849
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Quote:
Originally Posted by RV8JD
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Joan Rivers would've argued.
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RV-4 0320\D3G 160, Whirlwind 200GA 70".
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10-02-2014, 12:48 AM
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Join Date: Feb 2013
Location: Switzerland, Europe
Posts: 199
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impressive
Quote:
Originally Posted by RV8JD
Even the best have wrinkles!
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awesome images 
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10-02-2014, 09:13 AM
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Join Date: Aug 2011
Location: Monterrey, Mexico
Posts: 121
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what about paint?
If so....
What causes the paint not to form cracks?
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Miguel Vidal
EAA #1133587
RV-8 SB Wings in Monterrey, Mexico
N511MV Registered
MyKitLog
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10-02-2014, 10:08 AM
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Join Date: Sep 2010
Location: Seattle, WA
Posts: 120
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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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Shawn Li
RV-7-First Flight 5/27/2014
RV-10, Tailcone completed, wings in work
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10-02-2014, 10:42 AM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,768
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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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Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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10-02-2014, 10:49 AM
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VAF Moderator / Line Boy
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Join Date: Jan 2005
Location: Dayton, NV
Posts: 12,256
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Quote:
Originally Posted by Mel
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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Uh....and for future reference (while used airplane shopping), the serial number of that airframe would be....?  
__________________
Paul F. Dye
Editor at Large - KITPLANES Magazine
RV-8 - N188PD - "Valkyrie"
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
A&P, EAA Tech Counselor/Flight Advisor
Dayton Valley Airpark (A34)
http://Ironflight.com
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