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06-05-2010, 01:50 PM
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Join Date: Dec 2006
Location: Italy
Posts: 203
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When building my left wing I experienced some oil canning on the two most outboard bays. Contacted Gus at Van's, he gave me some directions to correct it, but he said it was just a cosmetic issue. I don't know if this apply to the rudder too, but you can contact Van's just for peace of mind.
(I corrected the oil canning on the wing and now the skin it drum tight  )
__________________
Claudio
Was Avellino - Italy...
Now Cypress, TX
www.rv7a.it
RV-7 I-KLAU (Reserved)
Empennage Done!! (except fiberglass)
Wings done!!
Working on aft fuse.
...SOLD! 
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06-06-2010, 03:32 PM
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Join Date: Oct 2009
Location: Gunter, TX
Posts: 314
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Thanks
Thanks for the comments. I have sent an email to Van's to get their advice. I'm not sure the expanding foam is a viable option. Will post Vans answer when received.
Skyking902001
RV8
emp.
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06-07-2010, 10:24 AM
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Join Date: Jun 2006
Location: Denver, CO
Posts: 61
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My -7 rudder had its share of oil canning too. I spent a lot of time and heart burn worrying about it, but eventually just got over it and moved on. If you get to the end of the project and still feel like you have to fix it, you can always do it then. I don't think it's worth the motivation and productivity hit to stop and try to fix it now. Keep rolling!
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06-07-2010, 01:21 PM
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Join Date: Oct 2009
Location: Gunter, TX
Posts: 314
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Van's Reply
Here is the first reply from Van's: "There's no way of predicting what might happen with certainty...there's no instance I've ever heard of where the rudder fluttered. It's perfectly ok -expected, even- that the builder will reform the leading edges by hand (it doesn't take much pressure) to make the skins fit without pulling."
Well, I'm not sure I understand their answer, so I asked for clarification and got a second response: "We'd prefer no oil canning. How it might affect flight is impossible to say. You might be able to correct it by drilling out some rivets along the spar, re-shaping the leading edge so it doesn't exert a pull/roll on the spar when it's clecoed, then re-riveting."
I'm not convinced that drilling out some of the spar rivets, "trying" to re-shape the leading edge and then re-riveting is a solution to the problem--but then, I don't have much experience in this area. I may try hand forming the bend a bit more, then finish up the rudder as best I can and move on to the elevators. Thanks to all who replyed.
Skyking902001
RV8
emp- 
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06-07-2010, 01:26 PM
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Join Date: Jan 2010
Location: Destin
Posts: 1,543
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anyone have a picture of what this looks like?
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06-07-2010, 03:15 PM
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Join Date: Oct 2009
Location: Gunter, TX
Posts: 314
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Pics of Rudder L.E. Roll
Here are the pics I sent to Van's.
 ,  ,
I'm not sure the pics show anything significant.
Sky
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06-10-2010, 07:46 AM
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Join Date: Oct 2009
Location: Gunter, TX
Posts: 314
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Moving On--
Last night I gave the rudder one last chance to straighten up. I rolled, squeezed, hand formed, whispered softly, yelled loudly--all had the same result--no change in the oil canning department. I suppose it is time to move on and accept that it is "good enough" or at least "as good as it's gonna get". Thanks to all who replied.
Skyking902001
RV8
emp-sort of
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06-10-2010, 09:35 AM
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Join Date: Jul 2007
Location: Delta, CO/Atlin, BC
Posts: 2,391
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Not exactly oil-canning, but related:
As a note to anyone reading this down the road somewhere, there are several old threads addressing the issue of rivets causing cracking near the LE of the rudder (yes, I have had this problem). This probably occurs because the stiffeners are not attached to the spar. Recommended is to proseal or put some other gluey stuff under the stiffeners, particularly near the leading edge so that the stress is distributed rather than focused on the first rivet when the rudder inevitably flexes in flight (think, during a slip).
cheers,
greg
__________________
Greg Arehart
RV-9B (Big tires) Tipup @AJZ or CYSQ
N 7965A
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01-03-2018, 03:10 PM
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Join Date: May 2017
Location: London, UK
Posts: 8
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Given this thread is 7 year old, just wondering if there?s any ?new? advice to deal with oil canning on the rudder.
I?ve just spent the evening inserting and removing clecos on my RV7 rudder, I?m trying to iradicate some oil canning in the lower third of the rudder which is more prevalent on the right skin than left, before I start drilling (the stiffeners are of course already riveted in place).
Having no luck iradicating the oil canning, I walked away and spent the rest of the evening browsing here and emailing vans.
If anyone has any thoughts to add to the mix, I?d be most grateful!
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01-03-2018, 03:22 PM
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Join Date: Oct 2017
Location: Las Vegas, NV
Posts: 407
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Isn’t there a fix where you bang a dent into the middle of a bay, then fill with micro? Sounds crude, but I saw it on YouTube, so it has to work..
Edit: I heard this for canning within wing bays, I don’t know if it applies to control surfaces, so please don’t take my advice! I was just wondering if anybody out there knows of this method and how to properly do it?
Last edited by Taltruda : 01-03-2018 at 04:25 PM.
Reason: Update
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