VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics


Go Back   VAF Forums > Main > RV General Discussion/News
Register FAQ Members List Calendar Today's Posts

Reply
 
Thread Tools Search this Thread Display Modes
  #11  
Old 06-05-2010, 01:50 PM
mototopo's Avatar
mototopo mototopo is offline
 
Join Date: Dec 2006
Location: Italy
Posts: 203
Default

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!
Reply With Quote
  #12  
Old 06-06-2010, 03:32 PM
skyking902001's Avatar
skyking902001 skyking902001 is online now
 
Join Date: Oct 2009
Location: Gunter, TX
Posts: 314
Default 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.
Reply With Quote
  #13  
Old 06-07-2010, 10:24 AM
mackd's Avatar
mackd mackd is offline
 
Join Date: Jun 2006
Location: Denver, CO
Posts: 61
Default

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!
__________________
David Mack
RV-7 Fuselage In Progress
Fort Collins, CO

http://davidandemily.org/~mackd/rv/
Reply With Quote
  #14  
Old 06-07-2010, 01:21 PM
skyking902001's Avatar
skyking902001 skyking902001 is online now
 
Join Date: Oct 2009
Location: Gunter, TX
Posts: 314
Default 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-
Reply With Quote
  #15  
Old 06-07-2010, 01:26 PM
bkthomps bkthomps is offline
 
Join Date: Jan 2010
Location: Destin
Posts: 1,543
Default

anyone have a picture of what this looks like?
Reply With Quote
  #16  
Old 06-07-2010, 03:15 PM
skyking902001's Avatar
skyking902001 skyking902001 is online now
 
Join Date: Oct 2009
Location: Gunter, TX
Posts: 314
Default 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
Reply With Quote
  #17  
Old 06-10-2010, 07:46 AM
skyking902001's Avatar
skyking902001 skyking902001 is online now
 
Join Date: Oct 2009
Location: Gunter, TX
Posts: 314
Default 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
Reply With Quote
  #18  
Old 06-10-2010, 09:35 AM
Greg Arehart's Avatar
Greg Arehart Greg Arehart is offline
 
Join Date: Jul 2007
Location: Delta, CO/Atlin, BC
Posts: 2,391
Default

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
Reply With Quote
  #19  
Old 01-03-2018, 03:10 PM
Chrisran75 Chrisran75 is offline
 
Join Date: May 2017
Location: London, UK
Posts: 8
Default

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!
Reply With Quote
  #20  
Old 01-03-2018, 03:22 PM
Taltruda Taltruda is offline
 
Join Date: Oct 2017
Location: Las Vegas, NV
Posts: 407
Default

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
Reply With Quote
Reply



Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 05:54 AM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.