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  #1  
Old 03-08-2010, 02:40 PM
jpharrell jpharrell is offline
 
Join Date: Jan 2010
Location: Mission Viejo, CA
Posts: 130
Unhappy RV-7 Rudder Skin Oil Canning

I am seeing the rudder skin oil canning problem on the RV-7A rudder I am building. I just started riveting the skins on when I saw it so I stopped and checked the forums. I saw some posts from years ago indicating that this is not uncommon. It's in four spots on each side of my rudder. Has anybody found a good way to deal with this in the last couple of years? I spoke to Vans Builder Support this morning and they said it's not an aerodynamic issue and is inevitable to some degree but it still makes me a bit uncomfortable. I still have access to the inside of the skins and could possibly do something about it if there is a good approach.

RV-7A in Mission Viejo, CA
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  #2  
Old 03-08-2010, 03:49 PM
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FresnoR FresnoR is offline
 
Join Date: Oct 2008
Location: Fresno, CA
Posts: 475
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You might want to verify that the skin stiffeners are cut short enough to provide the needed clearance from the rear spar. I accidently cut mine too long and the spar would push up against those stiffeners causing that type of effect.
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  #3  
Old 03-08-2010, 06:04 PM
jpharrell jpharrell is offline
 
Join Date: Jan 2010
Location: Mission Viejo, CA
Posts: 130
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I did check that during initial assembly of the rudder and found that one stiffener was touching one of the reinforcement plates on the spar. I trimmed it before final assembly and verified that it now has clearance. But thanks for the suggestion anyway.
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  #4  
Old 03-09-2010, 09:15 PM
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danielhv danielhv is offline
 
Join Date: Jul 2007
Location: Mesquite, TX
Posts: 936
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Quote:
Originally Posted by jpharrell View Post
I did check that during initial assembly of the rudder and found that one stiffener was touching one of the reinforcement plates on the spar. I trimmed it before final assembly and verified that it now has clearance. But thanks for the suggestion anyway.
can you take any pics?
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  #5  
Old 03-09-2010, 10:21 PM
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lostpilot28 lostpilot28 is offline
 
Join Date: Nov 2006
Location: Boise, ID
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Hi JP, oil canning on the rudder is pretty typical for a lot of builders. If you do a search, you'll note that a lot of guys see it on the lower half of the rudder. That's where mine is at. I wouldn't worry about it too much. Build on.
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  #6  
Old 03-11-2010, 07:01 PM
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G3i Ignition G3i Ignition is offline
 
Join Date: Aug 2009
Location: Littleton, Colorado
Posts: 181
Default Removing rudder oil canning

When I was building my 6 back in early 90's I had the same issue with the rudder having some slight oil canning after assembly. I was told thatís norm and expect to get some cracks around the rivet heads with flight time. That wasnít for me. The way I corrected it was injecting some of that yellow insulating/expanding foam you can get from the HD that gets a hard water proof outer shell. I used and tube extension to start at the bottom and work about a 1/3rd up from the trailing edge. Don't unload the whole can, experiment first with a mockup, it expands fast!!! Worked great and removed all the oil canning and with hardly no weight penalty

Thomas S.
www.g3ignition.com
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