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Wing skin oil-canning

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dfischer(at)iserv.net
Guest

Posted: Tue Oct 17, 2006 7:22 pm Post subject: Wing skin oil-canning

I just finished  riveting on the top LH wing skins and I noticed one of the 

"squares" was  indented and would "oil can" when pushed from the inside.  

The square  is bounded by two ribs (the fourth and fifth from the tip), the 

forward  spar, and the "J"stringer.  It is the fourth bay inboard from the 

tip  (RV-9).  All other skin "squares" are tight/neutral.  Any ideas (other  

than drilling out every rivet in the skin) to address this issue?  I  was 

thinking of drilling out the rivets around the square to allow the skin  to 

average out between three squares and re-rivet.  Just wanted to see  if 

anyone else has run into this problem and worked out a solution.   Other 

than this the skin is perfect (well, pretty good at least).   Thanks in 

advance for the help!



Doug Fischer

Jenison, MI

RV-9A  Wings

 do not  archive



    [quote][b]

dthomas773(at)sbcglobal.n
Guest

Posted: Tue Oct 17, 2006 8:28 pm Post subject: Wing skin oil-canning

Don't worry about it.  If it doesn't move more than

1/8 inch you don't need to worry.  Mine does that and

after 300 hours it's OK.



Dennis THomas



--- Doug Fischer <dfischer(at)iserv.net> wrote:



 	  Quote: 	
		   I just finished riveting on the top LH wing skins

 and I noticed one of the 

 "squares" was indented and would "oil can" when

 pushed from the inside.  

 The square is bounded by two ribs (the fourth and

 fifth from the tip), the 

 forward spar, and the "J"stringer.  It is the fourth

 bay inboard from the 

 tip (RV-9).  All other skin "squares" are

 tight/neutral.  Any ideas (other 

 than drilling out every rivet in the skin) to

 address this issue?  I was 

 thinking of drilling out the rivets around the

 square to allow the skin to 

 average out between three squares and re-rivet. 

 Just wanted to see if 

 anyone else has run into this problem and worked out

 a solution.  Other 

 than this the skin is perfect (well, pretty good at

 least).  Thanks in 

 advance for the help!

 

 Doug Fischer

 Jenison, MI

 RV-9A Wings

 do not archive

sa300(at)uniserve.com
Guest

Posted: Tue Oct 17, 2006 9:56 pm Post subject: Wing skin oil-canning

Don't worry about it. A lot of metal planes have oil canning in them, the wing panels upper and lower or the fuselage, and all control surfaces. Move on and continue building. You will only make a big mess if you try to get rid of it.

 

 dthomas773(at)sbcglobal.net (dthomas773(at)sbcglobal.net) wrote: [quote]    	  Quote: 	
		  --> RV9-List message posted by: <dthomas773(at)sbcglobal.net> (dthomas773(at)sbcglobal.net)



Don't worry about it.  If it doesn't move more than

1/8 inch you don't need to worry.  Mine does that and

after 300 hours it's OK.



Dennis THomas



--- Doug Fischer <dfischer(at)iserv.net> (dfischer(at)iserv.net) wrote:



        	  Quote: 	
		  I just finished riveting on the top LH wing skins

and I noticed one of the 

"squares" was indented and would "oil can" when

pushed from the inside.  

The square is bounded by two ribs (the fourth and

fifth from the tip), the 

forward spar, and the "J"stringer.  It is the fourth

bay inboard from the 

tip (RV-9).  All other skin "squares" are

tight/neutral.  Any ideas (other 

than drilling out every rivet in the skin) to

address this issue?  I was 

thinking of drilling out the rivets around the

square to allow the skin to 

average out between three squares and re-rivet. 

Just wanted to see if 

anyone else has run into this problem and worked out

a solution.  Other 

than this the skin is perfect (well, pretty good at

least).  Thanks in 

advance for the help!



Doug Fischer

Jenison, MI

RV-9A Wings

do not archive



    	
   



  	
 [b]

noel(at)blueskyaviation.n
Guest

Posted: Wed Oct 18, 2006 6:36 am Post subject: Wing skin oil-canning

It’s a real shocker to see that after completing a wing.  I had it on an RV-10 I built.  After flying I was able to overlook it some what and enjoy the ride.  

   

Noel   

RV-9A (for sale)  

   

   

         

  

From: owner-rv9-list-server(at)matronics.com [mailto:owner-rv9-list-server(at)matronics.com] On Behalf Of Doug Fischer

 Sent: Tuesday, October 17, 2006 9:22 PM

 To: RV-9 Matronics List; RV Matronics List

 Subject: Wing skin oil-canning  

  

     

I just finished riveting on the top LH wing skins and I noticed one of the 

 "squares" was indented and would "oil can" when pushed from the inside.  

 The square is bounded by two ribs (the fourth and fifth from the tip), the 

 forward spar, and the "J"stringer.  It is the fourth bay inboard from the 

 tip (RV-9).  All other skin "squares" are tight/neutral.  Any ideas (other 

 than drilling out every rivet in the skin) to address this issue?  I was 

 thinking of drilling out the rivets around the square to allow the skin to 

 average out between three squares and re-rivet.  Just wanted to see if 

 anyone else has run into this problem and worked out a solution.  Other 

 than this the skin is perfect (well, pretty good at least).  Thanks in 

 advance for the help!

 

 Doug Fischer

 Jenison, MI

 RV-9A Wings  

    

do not archive  

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       [quote][b]

chenoweth(at)gwi.net
Guest

Posted: Fri Oct 20, 2006 3:58 am Post subject: Wing skin oil-canning

Doug,

 I don't have anything to add to what  you've gotten from this and the RV list.  But, here's a bit of warning  about what may be a common oil can problem with the fuselage.  The bay  between bulkheads 707 and 708 on my 9 was really very bad - lots of slack in the  skin.  My RV7A (flying) neighbor has the same problem.  He's living  with his (I gather it's quite startling when it oil cans in  flight).  I asked Van's about putting a J stringer in.  They said  no problem and that I didn't have to attach it to the bulkheads.  Someone  on the List cautioned about cracking skin if the stiffener wasn't tied to the  bulkheads so I did that.  I put in two due to the difficulty of getting one  in the exact middle.  Problem solved.

 Bill

 Albion, Maine

 About to rivet center section to tail  cone.

 [quote]   ---

sa300(at)uniserve.com
Guest

Posted: Fri Oct 20, 2006 6:44 am Post subject: Wing skin oil-canning

One thing that you do not want to do while riveting skins on is to use an incandescent trouble light. The heat generated from the light bulb is enough to expand the skin and this too can cause a loose skin. Found this out a few planes ago.

 

 Chenoweth wrote: [quote]            Doug,

   I don't have anything to add to what you've gotten from this and the RV list.  But, here's a bit of warning about what may be a common oil can problem with the fuselage.  The bay between bulkheads 707 and 708 on my 9 was really very bad - lots of slack in the skin.  My RV7A (flying) neighbor has the same problem.  He's living with his (I gather it's quite startling when it oil cans in flight).  I asked Van's about putting a J stringer in.  They said no problem and that I didn't have to attach it to the bulkheads.  Someone on the List cautioned about cracking skin if the stiffener wasn't tied to the bulkheads so I did that.  I put in two due to the difficulty of getting one in the exact middle.  Problem solved.

   Bill

   Albion, Maine

   About to rivet center section to tail cone.

    	  Quote: 	
		       ----- Original Message ----- 

     From:     Doug Fischer (dfischer(at)iserv.net) 

     To:     RV-9 Matronics List (rv9-list(at)matronics.com) ; RV Matronics List (rv-list(at)matronics.com) 

     Sent: Tuesday, October 17, 2006 11:21 PM

     Subject: Wing skin oil-canning

     

     

     I just finished riveting on the top LH wing skins and I noticed one of the 

 "squares" was indented and would "oil can" when pushed from the inside.  

 The square is bounded by two ribs (the fourth and fifth from the tip), the 

 forward spar, and the "J"stringer.  It is the fourth bay inboard from the 

 tip (RV-9).  All other skin "squares" are tight/neutral.  Any ideas (other 

 than drilling out every rivet in the skin) to address this issue?  I was 

 thinking of drilling out the rivets around the square to allow the skin to 

 average out between three squares and re-rivet.  Just wanted to see if 

 anyone else has run into this problem and worked out a solution.  Other     

 than this the skin is perfect (well, pretty good at least).  Thanks in 

 advance for the help!

     

 Doug Fischer

 Jenison, MI

 RV-9A Wings

     do not archive

     

      	  Quote: 	
		  



href="http://www.matronics.com/Navigator?RV9-List">http://www.matronics.com/Navigator?RV9-List



	
   

	
   

   

   

 [b]

chenoweth(at)gwi.net
Guest

Posted: Fri Oct 20, 2006 11:43 am Post subject: Wing skin oil-canning

I don't remember if I used my  incandescent or my fluorescent (which actually generates a surprising amount of  heat) but it might well have been the root of my problem.  

 Thanks for the tip.

 Bill

 [quote]   ---

dfischer(at)iserv.net
Guest

Posted: Fri Oct 20, 2006 1:30 pm Post subject: Wing skin oil-canning

 	  Quote: 	
		    Definitely not the issue here - All the lighting in the build area is

flourescent.
	




Do not archive

 I don't remember if I used my incandescent or my fluorescent (which

[quote] actually generates a surprising amount of heat) but it might well have

 been the root of my problem.

 Thanks for the tip.

 Bill

   ---

aurbo(at)ak.net
Guest

Posted: Fri Oct 20, 2006 3:59 pm Post subject: Wing skin oil-canning

Hi,



Don't drill out the oil can skin, you are likely to do more damage than good. I have heard of some folks just pro-sealing in some J-stringers where the oil canning takes place.



Mike Ice

Electrical

RV-9 

Anchorage, Alaska



---

chenoweth(at)gwi.net
Guest

Posted: Sat Oct 21, 2006 4:08 pm Post subject: Wing skin oil-canning

Mike,

Not sure what you mean by "drilling out".  I riveted my two Js into the

fuselage bay and that has certainly cured the oil can problem but, of

course, what will happen when the plane is flying remains to be seen.

Bill

---

aurbo(at)ak.net
Guest

Posted: Sat Oct 21, 2006 5:38 pm Post subject: Wing skin oil-canning

Bill,



At the beginning of this tread, Mr. Fischer was wondering if he should " I 

was

 thinking of drilling out the rivets around the square to allow the skin to 

average out between three squares and re-rivet".



Sorry for the confusion.



Mike

---

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