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Wing skin tension

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bressler(at)wyoming.com
Guest

Posted: Fri Jan 27, 2006 7:20 am Post subject: Wing skin tension

Thread Users:

We are building a 601XL from a kit and are about to turn the first wing. The Photo Guide indicates that after installation of the nose ribs and leading edge skin, the wing is again turned and tension straps are used for making the final curvature. The instructions indicate that a 2x4 should be used to bring the skin into alignment. Our concern is that local lumber yards only handle grade 2 "construction grade" pine that will have warps and twists in a 12' length. How important is it that the 2x4 be straight and flat? Is there another method that others have used for load distribution?



Wes & Lurlene Bressler

frank.hinde(at)hp.com
Guest

Posted: Fri Jan 27, 2006 7:56 am Post subject: Wing skin tension

It certainly does not have to be completely flat but not horribly

twisted either....a standard #2 should be fine.



If your worried about it u could rip some strips of ply and glue them

together to make 1.5 thick but personally I think this is overkill.



Frank

601 HDS 390 hours 



--

BillHowerton
Guest

Posted: Fri Jan 27, 2006 8:09 am Post subject: Wing skin tension

I'ts reallno not critical that the boards be perferct, as long as they

can lay flat on the skin.  The main thing you need to think about is that

the skin be subjected to even pressure.  Instead of 2X4's I used three

1X2's.  That way, I was able to duct-tape them to the skin so they

wouldn't shift while the straps were tightened.



Bill



  ---

doug kandle

Joined: 09 Jan 2006
Posts: 33
Location: Boise ID

Posted: Fri Jan 27, 2006 8:12 am Post subject: Wing skin tension

Wes & Lurlene:

I used lengths MDF and vinyl trim/moldings (trim used on exterior 

doors is about 1 x 2 or a bit bigger).  While neither of these are as 

rigid as solid wood, they are dimensionally stable.  They worked 

well, especially the vinyl.

Doug Kandle, CH 701



At 08:15 AM 1/27/2006, you wrote:

 	  Quote: 	
		  

<bressler(at)wyoming.com>



Thread Users:

We are building a 601XL from a kit and are about to turn the first 

wing. The Photo Guide indicates that after installation of the nose 

ribs and leading edge skin, the wing is again turned and tension 

straps are used for making the final curvature. The instructions 

indicate that a 2x4 should be used to bring the skin into alignment. 

Our concern is that local lumber yards only handle grade 2 

"construction grade" pine that will have warps and twists in a 12' 

length. How important is it that the 2x4 be straight and flat? Is 

there another method that others have used for load distribution?



Wes & Lurlene Bressler

nfivesl(at)yahoo.com
Guest

Posted: Fri Jan 27, 2006 8:46 am Post subject: Wing skin tension

Hi Wes (and Lurlene):



Don't sweat it.  As long as you can find something

that will press evenly across most of the length you

will be fine.  I did it so many times I didn't use the

wood after it was drilled.  I ripped a 2x4 in half so

I'd have two pieces.  It's just there to spread out

the load.  Here's a picture and you can see that my

timber was not perfectly flat:



http://www.cooknwithgas.com/2_25_04_Wing1.JPG



You will be a pro at this before it's over since

you'll get lots of practice.  



Happy Building,



Scott Laughlin

www.cooknwithgas.com



--- Wes or Lurlene Bressler <bressler(at)wyoming.com>

wrote:



 	  Quote: 	
		   

 Bressler" <bressler(at)wyoming.com>


	


 Is there another method that others have

 	  Quote: 	
		   used for load distribution?

 

 Wes & Lurlene Bressler

p.mulwitz(at)worldnet.att
Guest

Posted: Fri Jan 27, 2006 9:15 am Post subject: Wing skin tension

 	  Quote: 	
		  I guess we all missed the part about using 2x4's. I used 1x3's I 

selected for their straight grain.  I agree it is more important for 

the boards to be flat than anything else.  It doesn't matter if they 

have holes in them or chips missing - only that they can lay flat on the skin.


	




Good luck,



Paul

XL wings

 	  Quote: 	
		  Thread Users:

We are building a 601XL from a kit and are about to turn the first 

wing. The Photo Guide indicates that after installation of the nose 

ribs and leading edge skin, the wing is again turned and tension 

straps are used for making the final curvature. The instructions 

indicate that a 2x4 should be used to bring the skin into alignment. 

Our concern is that local lumber yards only handle grade 2 

"construction grade" pine that will have warps and twists in a 12' 

length. How important is it that the 2x4 be straight and flat? Is 

there another method that others have used for load distribution?



Wes & Lurlene Bressler




	


-

zodierocket(at)hsfx.ca
Guest

Posted: Fri Jan 27, 2006 3:36 pm Post subject: Wing skin tension

DUCT TAPE !!! now why the hell didn't I think of that on my 1X2's The

shifting board act was akin to an episode of the keystone cops!!!



Mark Townsend  Alma, Ontario

Zodiac 601XL C-GOXL, CH701 just started

www.ch601.org / www.ch701.com / www.Osprey2.com



--

billn(at)velocity.net
Guest

Posted: Fri Jan 27, 2006 3:52 pm Post subject: Wing skin tension

The hold-down doesn't "Bring the skin into alignment". Correct shim height,

making sure the shims can't move, and making sure you have the print correct

part in the print correct location does.

I found that the 1x3s I scavenged from the packing crate to be perfectly

suitable. Just make sure there are no exposed staples.

                                                                    Bill

---

nfivesl(at)yahoo.com
Guest

Posted: Fri Jan 27, 2006 4:43 pm Post subject: Wing skin tension

Shims?  You lost me there.  I must have missed

something because I didn't use any shims.  



--- "William J. Naumuk" <billn(at)velocity.net> wrote:



 	  Quote: 	
		   

 Naumuk" <billn(at)velocity.net>

 

 The hold-down doesn't "Bring the skin into

 alignment". Correct shim height,

 making sure the shims can't move, and making sure

 you have the print correct

 part in the print correct location does.

bressler(at)wyoming.com
Guest

Posted: Sun Jan 29, 2006 6:49 am Post subject: Wing Skin Tension

Thanks Guys:

Thanks for all the responses, it was nearly overwhelming. The many suggestions are greatly appreciated. We will try to get through our worrisome period and, as Nick would say " be productive".      Do Not Archive

Wes & Lurlene Bressler

Laramie, WY

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