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  #1  
Old 06-10-2022, 03:46 PM
hk1232's Avatar
hk1232 hk1232 is offline
 
Join Date: Jan 2022
Location: Minneapolis, MN
Posts: 8
Default Adjusting Spar and Rib Flanges

Working on my RV-9 empennage and notice the flanges on the ribs and spars aren't at a 90. I expected this.

Was looking to build out the tool discussed in this thread:
https://vansairforce.net/community/s...e+bending+tool

But I notice that the tool seems to be angled to adjust over-bent flanges. Spot checking both ribs and spars I see they are all under-bent.

  1. Are mine already "square enough" and you recommend taking no action?
  2. Am I looking at the tool mentioned in the referenced thread wrong and it will in fact work with what I have?
  3. Have you built a reversible tool that corrects for both over- and under-bent flanges?
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  #2  
Old 06-10-2022, 04:18 PM
hk1232's Avatar
hk1232 hk1232 is offline
 
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Location: Minneapolis, MN
Posts: 8
Default

Ok I'm looking at the tool more closely now -- this will do what I'm looking for.

Assume the hive mind opinion is that these two examples are in fact under-bent and should be adjusted to a straight 90?
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  #3  
Old 06-10-2022, 04:25 PM
RBR RBR is offline
 
Join Date: Nov 2006
Location: Brisbane, Australia
Posts: 90
Default Please do not adjust the angle of the spar!

Are we looking at the VS?

The 'angle' you are considering adjusting is designed to pickup the taper in the skin as it angles back from a skinny leading edge to a chunkier trailing edge.

If you cleco the structure together you will get a better overview. When it is all together you will get to see the geometry.

As for the ribs, the adjust & flute process will likely have moved the angle again! So re-check the angle after fluting.

Hope this helps!

Is there an EAA Chapter nearby?
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  #4  
Old 06-10-2022, 04:56 PM
David Paule David Paule is offline
 
Join Date: Dec 2009
Location: Boulder, CO
Posts: 5,487
Default

That's my tool in post #3 in that thread. It worked well whenever I had a flange like yours, regardless of which direction it needed to go. But as the previous poster wrote, some flanges aren't supposed to be at 90 deg. to the web, so check first.

Dave
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  #5  
Old 06-10-2022, 05:57 PM
wirejock's Avatar
wirejock wirejock is offline
 
Join Date: Oct 2005
Location: Estes Park, CO
Posts: 5,698
Default Flange bending

Like Dave mentioned. Make sure the flange should be adjusted. Spars usually don't need it. Ribs usually but not alwsts. Dave's tool flexes past square then the flange reflexes to 90. It works like a charm.
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Builder Blog: http://wirejockrv7a.blogspot.com
Donated 12/01/2021, plus a little extra.
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I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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  #6  
Old 06-11-2022, 07:31 PM
Marc Bourget Marc Bourget is offline
 
Join Date: Apr 2009
Location: Stockton, California
Posts: 383
Default

Consider forming the rib flange to 85-87 deg and rolling the edge of the rib flange a bit more.

I've seen where the flange will "relax" or open up when riveting and with flight load cycles, leaves a crease in the skin.

FWIW
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