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bottom wing skin

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cjhukill(at)cox.net
Guest

Posted: Tue Dec 18, 2007 8:43 am Post subject: bottom wing skin

After reading this thread about oil canning of the  OB bottom skins, I took a good look at mine, that are clecoed on, but not yet  dimpled. I see considerable oil canning, and the forward edge of the skin is  tight against the forward skin and actually overlapping it slightly in some  areas. I obviously need to trim some off the aft skin, but short of blazing away  with a file, I wonder if anyone knows a way to remove this material and leave a  smooth, strait edge.

 I have not put a preload bend in the skin as you  would with an overlapping skin, but I wonder if that would shrink it as well?  The plans don't instruct you to put the preload bend even on the inboard edge  where it overlaps the IB skin, but I assume that's just an oversight? Any  suggestions?

 Chris Hukill

   [quote][b]

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ricksked(at)embarqmail.co
Guest

Posted: Tue Dec 18, 2007 8:55 am Post subject: bottom wing skin

I passed a file over then polished the leading edge and tank skins part of the skins until they fit against the wing skins. I also put the preload bend on the skind to allow it to lay as flat as possible after they were riveted.. My wings are in B-21 Chris if you want to take a look someday. 

Rick Sked 

49185

---

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drfred(at)suddenlinkmail.
Guest

Posted: Tue Dec 18, 2007 9:04 am Post subject: bottom wing skin

Chris;



Have you considered a "v" notched deburring tool?  Should trim off a 

couple thousandths each pass.  A good fine file is probably the best .  

Also, if you take a sharpie and put and run it and your finger down the 

edge before you trim, it gives you a line to thin down to see how much 

you took off.  I'd just recommend going slow with the a file and then 

rounding the edges with the v tool. 



Dr Fred.



Chris Hukill wrote:

 	  Quote: 	
		   After reading this thread about oil canning of the OB bottom skins, I 

 took a good look at mine, that are clecoed on, but not yet dimpled. I 

 see considerable oil canning, and the forward edge of the skin is 

 tight against the forward skin and actually overlapping it slightly in 

 some areas. I obviously need to trim some off the aft skin, but short 

 of blazing away with a file, I wonder if anyone knows a way to remove 

 this material and leave a smooth, strait edge.

 I have not put a preload bend in the skin as you would with an 

 overlapping skin, but I wonder if that would shrink it as well? The 

 plans don't instruct you to put the preload bend even on the inboard 

 edge where it overlaps the IB skin, but I assume that's just an 

 oversight? Any suggestions?

 Chris Hukill

 *

 *

 ------------------------------------------------------------------------

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jeff(at)westcottpress.com
Guest

Posted: Tue Dec 18, 2007 9:21 am Post subject: bottom wing skin

Take a long coarse file and run it lengthwise along the edge of the skin.  Finish with the file held at a 45 degree angle along the inside and outside edges to debur.

Jeff Carpenter

40304

On Dec 18, 2007, at 8:12 AM, Chris Hukill wrote:

 	  Quote: 	
		  After reading this thread about oil canning of the OB bottom skins, I took a good look at mine, that are clecoed on, but not yet dimpled. I see considerable oil canning, and the forward edge of the skin is tight against the forward skin and actually overlapping it slightly in some areas. I obviously need to trim some off the aft skin, but short of blazing away with a file, I wonder if anyone knows a way to remove this material and leave a smooth, strait edge.

I have not put a preload bend in the skin as you would with an overlapping skin, but I wonder if that would shrink it as well? The plans don't instruct you to put the preload bend even on the inboard edge where it overlaps the IB skin, but I assume that's just an oversight? Any suggestions?

Chris Hukill

 	  Quote: 	
		  http://www.matronics.com/contribution

href="http://www.matronics.com/Navigator?RV10-List">http://www.matronics.com/Navigator?RV10-List

href="http://forums.matronics.com">http://forums.matronics.com

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indigoonlatigo(at)msn.com
Guest

Posted: Tue Dec 18, 2007 9:45 am Post subject: bottom wing skin

As per taking material off the edge that joins to the LE skin, place a straight edge about 1/16" above the edge and mark it with a sharpie. I used a Vixen file and trimmed about 1/32" off.  Rivetting across in horizontal rows and moving forward as I discussd in the previous post brought the edge tight with no gap. 

  

 There is a point where you can take too much material off, remember the dimpled holes on the skin still have to line up with the countersunk holes in the spar cap. I noticed that my skin holes were slightly forward of the these countersunk holes in the spar cap...so you can go to far and you won't gain anything, only a gap in between the skins.

  

 I did not pre bend the skin at the inboard overlap. It layed absolutely flat with the inboard skin when rivetted. I don't see how this would take up any slack. All the dimples still need to basically line up.

  

 In my mind it seems that only couteracting these loaded ribs in rivetting order and thinking about how an offset dimple reacts to its dimpled breatheren, is the only way to tighten the skin. The above vixen file does absolutely help to a limited extent.

  

 John G.

 [quote]  From: cjhukill(at)cox.net

To: rv10-list(at)matronics.com

Subject: RV10-List: bottom wing skin

Date: Tue, 18 Dec 2007 08:12:06 -0800



     After reading this thread about oil canning of the OB bottom skins, I took a good look at mine, that are clecoed on, but not yet dimpled. I see considerable oil canning, and the forward edge of the skin is tight against the forward skin and actually overlapping it slightly in some areas. I obviously need to trim some off the aft skin, but short of blazing away with a file, I wonder if anyone knows a way to remove this material and leave a smooth, strait edge.

 I have not put a preload bend in the skin as you would with an overlapping skin, but I wonder if that would shrink it as well? The plans don't instruct you to put the preload bend even on the inboard edge where it overlaps the IB skin, but I assume that's just an oversight? Any suggestions?

 Chris Hukill

 	  Quote: 	
		  



blank>http://www.matronics.com/contribution

get=_blank>http://www.matronics.com/Navigator?RV10-List

p://forums.matronics.com



	
[b]

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indigoonlatigo(at)msn.com
Guest

Posted: Tue Dec 18, 2007 9:46 am Post subject: bottom wing skin

Yes, remeber to de bur the inner and outer edge with your preferred method.

  

 John G

 [quote]  From: cjhukill(at)cox.net

To: rv10-list(at)matronics.com

Subject: RV10-List: bottom wing skin

Date: Tue, 18 Dec 2007 08:12:06 -0800



     After reading this thread about oil canning of the OB bottom skins, I took a good look at mine, that are clecoed on, but not yet dimpled. I see considerable oil canning, and the forward edge of the skin is tight against the forward skin and actually overlapping it slightly in some areas. I obviously need to trim some off the aft skin, but short of blazing away with a file, I wonder if anyone knows a way to remove this material and leave a smooth, strait edge.

 I have not put a preload bend in the skin as you would with an overlapping skin, but I wonder if that would shrink it as well? The plans don't instruct you to put the preload bend even on the inboard edge where it overlaps the IB skin, but I assume that's just an oversight? Any suggestions?

 Chris Hukill

 	  Quote: 	
		  



blank>http://www.matronics.com/contribution

get=_blank>http://www.matronics.com/Navigator?RV10-List

p://forums.matronics.com



	
[b]

- The Matronics RV10-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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dlm46007(at)cox.net
Guest

Posted: Tue Dec 18, 2007 10:17 am Post subject: bottom wing skin

use a sanding block or compositie sanding  block

   From: owner-rv10-list-server(at)matronics.com  [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Chris  Hukill

Sent: Tuesday, December 18, 2007 9:12 AM

To:  rv10-list(at)matronics.com

Subject: bottom wing  skin

 After reading this thread about oil canning of the  OB bottom skins, I took a good look at mine, that are clecoed on, but not yet  dimpled. I see considerable oil canning, and the forward edge of the skin is  tight against the forward skin and actually overlapping it slightly in some  areas. I obviously need to trim some off the aft skin, but short of blazing away  with a file, I wonder if anyone knows a way to remove this material and leave a  smooth, strait edge.

 I have not put a preload bend in the skin as you  would with an overlapping skin, but I wonder if that would shrink it as well?  The plans don't instruct you to put the preload bend even on the inboard edge  where it overlaps the IB skin, but I assume that's just an oversight? Any  suggestions?

 Chris Hukill

[quote]

href="http://www.matronics.com/contribution">http://www.matronics.com/chref="http://www.matronics.com/Navigator?RV10-List">http://www.matronics.com/Navigator?RV10-List

href="http://forums.matronics.com">http://forums.matronics.com

[b]

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MauleDriver(at)nc.rr.com
Guest

Posted: Tue Dec 18, 2007 12:48 pm Post subject: bottom wing skin

Chris Hukill wrote:  	  Quote: 	
		              snippety snip... I obviously need to trim some off the aft skin, but short of blazing away with a file, I wonder if anyone knows a way to remove this material and leave a smooth, strait edge....

 	
 A word in general about filing skin edges.  I know that I didn't have a clue as to how to easily and quickly file down a skin edge using a file, particularly a Vixen file (whatever that is).  Perhaps everyone else knows what they are talking about but I think a lot is taken for granted here.  I still am not sure I understand how to properly use a file  on a skin edge but someone took the time to explain via email and the technique I ended up using really works easily and quickly so I assume it may be close to the accepted and proper technique.

 

 I place the sheet on a table with the edge overhanging slightly and use a clamp or two or hold in place.  Using a Vixen file from one of the tool houses, I lay the face of the file on the skin edge.    I hold the file with one hand on the handle and one hand holding the tip.  the length of the file is laid along the skin edge but at a slight angle  (15 degrees maybe) so that my hands don't contact the sheet.  Then a single, smooth stroke from one end to the other.  If everything is held steady, a nice clean cut is made with a significant amount of aluminum removed.  1,2,or 3 strokes is enough to smooth most edges.  Removal of 1/32" may only take 3 or 4 strokes (a wild ass guesstimate since I haven't measured before - John's technique for measuring sounds correct to me).  Very little dressing is required  afterwards to completely deburr the edge.  An edge trimmer will work, or scotchbrite or abrasive paper for final dressing.

 

 My guess is that just about everyone commenting here knows how to do this but I know I didn't have a clue until someone clued me in.  If someone wants a photo, send me an email.  

 

 Bill "lifetime modeler, woodworker, wing profiler and tinkerer that is still learning to use basic  hand tools while thinking about doing the QB skins" Watson

 Durham NC

 40605

    [quote][b]

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