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Longeron Bending

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BPETERS2(at)bak.rr.com
Guest

Posted: Tue Feb 06, 2007 12:53 am Post subject: Longeron Bending

Hi all,  

I’m about to try and bend the F718 longerons for my RV9A and I am terrified at the prospect.  Other than the fuel tanks this is what has kept me awake at night thinking about it.  I did an archive search and saw a couple ideas but was wondering if there was anymore wisdom out there I can lean on.  Pictures would be really appreciated as well.  Thanks in advance.  

   

Bruce Peters  

RV9A Fuselage  

Bakersfield, CA  

        [quote][b]

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chenoweth(at)gwi.net
Guest

Posted: Tue Feb 06, 2007 4:19 am Post subject: Longeron Bending

Bruce,

 I found the technique described in the Orndorff  video to be a good one and used it.  I particularly liked the idea of  clamping the two together to get the bends equal.  I have no metalwork  background and had my share of problems but none turned out to be  insurmountable.  I will caution you that I found that the "template" Van's  provided for the bend curve was not accurate in length.  Since I didn't  expect that I had made no effort to confirm that the length of the bend as  provided by the dimensions was the same as the length of the template.   Mine was off by 3/4".  You might be able to imagine the distress around  here till I figured out that the problem was the template and not something I'd  done wrong.  My 7A neighbor suggested using the 721B as a bend guide and  that worked fine.  That by, the way, is the technique described in the  video and also in the instructions for the RV7s.

  

 Your next excitement will most likely be bending  the side skin.  I wouldn't use the Orndorff technique for this.  I did  some experimenting with it and found that, for me, there was no obvious  way to go back and adjust the curve once you start.  I used the Van's  technique with great success.  

  

 Bill - RV9

 Albion, Maine

 [quote]   ---

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mike(at)learningplanet.co
Guest

Posted: Tue Feb 06, 2007 6:07 am Post subject: Longeron Bending

Hi Bruce,

Yes, bending the longerons is a time-consuming and somewhat tedious project, but once you're done, you're done. Just use the template and the canopy deck as guides and go slowly. It's not that difficult.



http://www.my9a.com/fuse5.asp#092204



Regards,

Mike Schipper

RV-9A - N63MS - 120 hours - www.my9a.com

RV-10 - #40576 - Wings



On Feb 6, 2007, at 2:51 AM, Bruce Peters wrote:

 	  Quote: 	
		  

Hi all,

I’m about to try and bend the F718 longerons for my RV9A and I am terrified at the prospect.  Other than the fuel tanks this is what has kept me awake at night thinking about it.  I did an archive search and saw a couple ideas but was wondering if there was anymore wisdom out there I can lean on.  Pictures would be really appreciated as well.  Thanks in advance.

 

Bruce Peters

RV9A Fuselage

Bakersfield, CA 	


 [quote][b]

- The Matronics RV9-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:

http://www.matronics.com/Navigator?RV9-List

BPETERS2(at)bak.rr.com
Guest

Posted: Tue Feb 06, 2007 8:49 pm Post subject: Longeron Bending

Bill,  

Thanks for the reply.  I appreciate the tip on the video and will order that.  I had noticed the measurements on the drawing were not accurate and just assumed that they were “not to scale” but that the general curve was accurate.  However, I’m glad to know that I wasn’t just seeing things.  There have been a couple other areas in the drawings so far that just seemed a little off but mostly I have been able to figure it out.  On bending the side skin I hadn’t read far enough ahead to realize it was going to be a challenge.  I was hoping maybe it was going to assume the shape of the longerons without much fuss.  Well, more to lay awake at night about!!!  Again, thanks for the help.  

   

Bruce  

   

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BPETERS2(at)bak.rr.com
Guest

Posted: Tue Feb 06, 2007 8:52 pm Post subject: Longeron Bending

Hi Mike,  

Thanks for the advice and link to your site.  That helps a lot.  I realized after looking at your pictures I forgot to put the radius in the end of the longeron when I trimmed out the piece.  Do you think that’s much an issue?  Or should I shorten up the longeron just a bit to accommodate a radius?  Again, thanks for the help.  

   

Bruce  

   

--

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mike(at)learningplanet.co
Guest

Posted: Wed Feb 07, 2007 2:38 pm Post subject: Longeron Bending

Bruce,



The radius is there to avoid stress cracks that form at sharp points. The radius doesn't need to be much: a 1/16" radius should be plenty. The aft end of the longeron has that notch in it just so it can fit around the bulkhead. Don't shorten your longeron, just extend your notch a little bit. Just enough to add a radius in the corner.



Mike



On Feb 6, 2007, at 10:51 PM, Bruce Peters wrote:

 	  Quote: 	
		  

Hi Mike,

Thanks for the advice and link to your site.  That helps a lot.  I realized after looking at your pictures I forgot to put the radius in the end of the longeron when I trimmed out the piece.  Do you think that’s much an issue?  Or should I shorten up the longeron just a bit to accommodate a radius?  Again, thanks for the help. 



Bruce

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BPETERS2(at)bak.rr.com
Guest

Posted: Wed Feb 07, 2007 10:40 pm Post subject: Longeron Bending

Mike, thanks, I’ll do that.  

   

Bruce  

   

Do not archive  

   

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