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User currently offlineSleekjet From United States of America, joined Jul 2001, 2046 posts, RR: 22
Posted (10 years 2 months 3 weeks 5 days 11 hours ago) and read 2397 times:

Freshly appearing in the latest photos is this:


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Photo © Roel Kroes



Can someone answer the question he has posed in the caption?


II Cor. 4:17-18
10 replies: All unread, jump to last
 
User currently offlineAirplay From , joined Dec 1969, posts, RR:
Reply 1, posted (10 years 2 months 3 weeks 5 days 10 hours ago) and read 2367 times:

Its hard to tell if those particular wrinkles are permanent or not, but many airframes (especially old battered ones like the subject 747) often have permanent ripples and wrinkles in the skins.

User currently offlineCdfMxTech From United States of America, joined Jul 2000, 1341 posts, RR: 27
Reply 2, posted (10 years 2 months 3 weeks 5 days 6 hours ago) and read 2193 times:

The Wrinkles and Buckles have an unofficial name...I think it is "Oil Canning". They are permanent (Section 46 is especially susceptable to this condition), though more noticeable at times than others. They are normal as defined by Aircraft Structural Repait manuals as long as they do not contain cracks and go through fasteners. Couple of other things as well, but can't recall.

[Edited 2004-06-09 07:51:07]

User currently offlineToni_ From Cape Verde, joined Apr 2002, 97 posts, RR: 0
Reply 3, posted (10 years 2 months 3 weeks 5 days 1 hour ago) and read 2078 times:

"Will these be permanent or just because of the pressure of the landing?"

These wrinkles are normal and not permanent. What you see is the rear end of the fuselage bending a bit downwards caused by the weight of the tail during that heavy landing. It shows how flexible these planes are. Same happens when a plane is on a tailjack during maintenance. These same wrinkles will appear on top of the plane.

Greetz Toni  Smile


User currently offlineBritPilot777 From United Kingdom, joined Apr 2004, 1075 posts, RR: 2
Reply 4, posted (10 years 2 months 3 weeks 5 days 1 hour ago) and read 2072 times:

Just looks like heat haze to me from the engines


Forever Flight
User currently offlineFredT From United Kingdom, joined Feb 2002, 2185 posts, RR: 26
Reply 5, posted (10 years 2 months 3 weeks 5 days 1 hour ago) and read 2064 times:

Those diagonal wrinkles is the way the skin of a stressed skin aircraft takes up the stress. They will always be present when there is a load on the structure, to a larger or smaller degree. Structural engineers spend a lot of time analysing them. As time and cycles build up, they often become more apparent.

Cheers,
Fred



I thought I was doing good trying to avoid those airport hotels... and look at me now.
User currently offlineA/c train From United Kingdom, joined Jun 2001, 501 posts, RR: 4
Reply 6, posted (10 years 2 months 3 weeks 4 days 20 hours ago) and read 1970 times:

Tonis explanation sounds good, were I work I always noted when I was on the fwd jack that the skin would wrinkle around the jacking point and then go away on lowering, therefore they are not permanent, there are .040" skin pockets in that area so it doesnt surprise me.
regards a/c


User currently offlineDiezel From Netherlands, joined Oct 2002, 646 posts, RR: 11
Reply 7, posted (10 years 2 months 3 weeks 4 days 13 hours ago) and read 1844 times:

I took the picture, thanks for reacting !

I also got an email from somebody who says that the wrinkles are permanent but will disappear when the aircraft is pressurized.

Roel.



Never be afraid of what you like. (Miles Davis)
User currently offlineAloges From Germany, joined Jan 2006, 8706 posts, RR: 43
Reply 8, posted (10 years 2 months 3 weeks 4 days 4 hours ago) and read 1769 times:

Here's another fine example of wrinkles, also on a KLM 747:

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Photo © Stephan Curkowskyj




Walk together, talk together all ye peoples of the earth. Then, and only then, shall ye have peace.
User currently offlineMD-90 From United States of America, joined Jan 2000, 8507 posts, RR: 12
Reply 9, posted (10 years 2 months 3 weeks 4 days 3 hours ago) and read 1757 times:

Look at the wing of every strut-braced Cessna ever built and they will all exhibit oil canning. It tends to be less visible on airliners because they have thicker gauge skins.

User currently offlineLiamksa From Australia, joined Oct 2001, 308 posts, RR: 0
Reply 10, posted (10 years 2 months 3 weeks 4 days 1 hour ago) and read 1737 times:

It's fascinating to watch the ripples in a low-wing aircraft when pulling a few G's. Kind of startling / amazing how much the wings flex and how much slack you can get on the top surface wing-skin!  Wow!

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