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  #1  
Old 02-27-2014, 11:14 AM
Barneybc12d Barneybc12d is offline
 
Join Date: Nov 2013
Location: Belleville, il
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Default Oil canning rudder

My "first time builder" rudder has some oil canning. How did yours turn out? I am going to push on my 76 Cessna skin this afternoon to compare.
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  #2  
Old 02-28-2014, 07:34 AM
HeliCooper HeliCooper is offline
 
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Location: Des Moines, IA
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Quote:
Originally Posted by Barneybc12d View Post
My "first time builder" rudder has some oil canning. How did yours turn out? I am going to push on my 76 Cessna skin this afternoon to compare.
My rudder and right elevator turned out great. My left elevator had some pretty significant oil canning. Advice from Van's was that its luck of the draw and there is really no way to know exactly what caused it or a way to build it to try and minimize it. They also said if you push on it and it pops back out on its own they wouldn't worry about it. If you push on it and it stays in that position then I would call Van's for further guidance.

Last edited by HeliCooper : 03-02-2014 at 09:35 AM.
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  #3  
Old 03-01-2014, 11:07 AM
Qui Qui is offline
 
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Location: Poplar Grove, IL
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Checked my rudder after reading this post and although there is some oil canning, it is less than that of my C 172 rudder.
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  #4  
Old 03-01-2014, 11:38 AM
TThurston TThurston is offline
 
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Location: Orem, UT
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Default What is "oil canning"?

Would someone please explain this term? Pictures might help, too.
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  #5  
Old 03-01-2014, 11:59 AM
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cln1owner cln1owner is offline
 
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Quote:
Originally Posted by TThurston View Post
Would someone please explain this term? Pictures might help, too.
An attempt to explain:
Flexing of the skin, with some spring to it, between ribs, similar to the skin of a drum. My rudder has some, other parts of the plane as well, especially when its warm out and in the sun.
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  #6  
Old 04-06-2014, 01:40 PM
JDA_BTR JDA_BTR is offline
 
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Location: Baton Rouge, LA
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The right side of my rudder has the slightest amount too. I noticed it after bending the leading edge. My edge matches the templates but maybe the way I did it created the flex - can't say. But I'm not going to redo it?. Its slight.
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  #7  
Old 04-06-2014, 01:58 PM
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rzbill rzbill is offline
 
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Quote:
Originally Posted by TThurston View Post
Would someone please explain this term? Pictures might help, too.
The others are correct as it applies to the skins. However, to give a little more etymology to the term, you have to imagine (if you're not old enough to remember) the spiral paperboard oil cans before the blowmolded ones of today (Thanks Graham Engineering).

Anyway, you poked a penetrating funnel into the metal end cap of the can and inverted the whole thing into the filler hole of the engine. The other metal end of the can would pulse in and out as the oil "glugged" unto the engine. IE "oilcanning". As you can again imagine, there are many container types that will exhibit the same phenomenon when being quickly emptied. The term has evolved to cover nearly any thin membrane that has a bi-stable or nearly bi-stable configuration.
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Last edited by rzbill : 04-06-2014 at 02:25 PM.
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  #8  
Old 04-06-2014, 02:54 PM
YellowJacket RV9 YellowJacket RV9 is offline
 
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Location: Clearwater, FL KCLW
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Quote:
Originally Posted by HeliCooper View Post
My rudder and right elevator turned out great. My left elevator had some pretty significant oil canning. Advice from Van's was that its luck of the draw and there is really no way to know exactly what caused it or a way to build it to try and minimize it. They also said if you push on it and it pops back out on its own they wouldn't worry about it. If you push on it and it stays in that position then I would call Van's for further guidance.
Does anybody know why further guidance is suggested if it doesn't pop back out? I was quite sure that my rudder was perfect until I pushed on it just now and found a section that will not spring back when pushed in. It will just stay there until the section underneath is pushed in. Anybody heard guidance from Vans on this?

Chris
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  #9  
Old 04-06-2014, 07:59 PM
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N804RV N804RV is offline
 
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Location: Mount Vernon, Wa
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Quote:
Originally Posted by YellowJacket RV9 View Post
Does anybody know why further guidance is suggested if it doesn't pop back out? I was quite sure that my rudder was perfect until I pushed on it just now and found a section that will not spring back when pushed in. It will just stay there until the section underneath is pushed in. Anybody heard guidance from Vans on this?

Chris
I don't know for a fact. But, I'm guessing Van's would say as long as it springs back, Pushing on either side, and doesn't deform or "crease" you're OK. Just keep and eye on it for any permanent deformation. When the structure deforms, there's a likely an eventual loss of structural rigidity.

Quote:
Originally Posted by rzbill View Post
... you have to imagine (if you're not old enough to remember) the spiral paperboard oil cans before the blowmolded ones of today (Thanks Graham Engineering).

...The other metal end of the can would pulse in and out as the oil "glugged" unto the engine. IE "oilcanning".....
Actually, the term is even older than that:



On the "old" oil cans, you squirted maching oil on a squeaky part to lubricate it, by pushing on the bottom of the inverted can. It had just enough give to do the job, and would spring back as you released.

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Last edited by N804RV : 04-06-2014 at 08:07 PM.
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  #10  
Old 04-07-2014, 05:39 AM
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rzbill rzbill is offline
 
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Quote:
Originally Posted by N804RV View Post
Actually, the term is even older than that:



On the "old" oil cans, you squirted maching oil on a squeaky part to lubricate it, by pushing on the bottom of the inverted can. It had just enough give to do the job, and would spring back as you released.

True dat. Was pretty sure the whipper snappers never saw one of those.
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YIO-360-M1B, mags, CS, GRT EX and WS H1s & A/P, Navworx
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