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rib/leading edge of front spar gap

 
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jaydub



Joined: 07 Jan 2020
Posts: 74

PostPosted: Sat Apr 17, 2021 3:08 pm    Post subject: rib/leading edge of front spar gap Reply with quote

I'm working on my FS2 I bought partially completed.  The previous owner did a pretty good job on most everything.  However, when inspecting the wings I noticed if I lay a straight edge on the nose of the ribs and the end of the rib (just in front of the rivet) that the straight edge is about 3/32" up above the front spar.  This means there will be protrusions in the fabric at every rib once covered. It sounds like this should have been checked in the building process but got overlooked somehow.
 
Short of unriveting everything off the leading edge spar and either rotating it (which would be weaker due to the holes) or just replacing it by getting the ribs back just a bit more, are the protrusions something I need to fix?  I know I can tape over each one but is there a better way so the protrusions don't poke through the fabric?  I don't feel comfortable taking a cutoff wheel to the rib protrusions as I could easily damage that leading edge spar with a little slip.
 
Jay


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Richard Pike



Joined: 09 Jan 2006
Posts: 1669
Location: Blountville, Tennessee

PostPosted: Sat Apr 17, 2021 6:16 pm    Post subject: Re: rib/leading edge of front spar gap Reply with quote

If I were you I would buy a roll of this stuff, lay a couple or three plys over the end of the ribs onto the leading edge, blend them in, and cover just the first foot or so of the wing with some scrap fabric across a couple rib bays and see if it looks acceptable.
https://www.aircraftspruce.com/catalog/cspages/antichafe09-02110.php


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Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0

Forgiving is tough, being forgiven is wonderful, and God's grace really is amazing.
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PostPosted: Sun Apr 18, 2021 7:48 am    Post subject: rib/leading edge of front spar gap Reply with quote

Jay
Photos would be very helpful. Most ribs are built by the factory because they were such a good deal and they do stick up a bit. Is it a problem NO. Definitely put anti chafe tape on them. My MKIIIC is app. 30 years old and there are no issues in that area. I suppose one could squeeze the ends of the tubing a bit to make it a bit flat but don't make it worse by weakening the rib.
See the attached photo. Zoom in, the ribs stick up but is that a problem or there by design? Sorry I'm NOT going to compress the photo because you need to zoom in to see the detail.
Worth what you paid for it.
Rick Neilsen
Redrive VW Powered MKIIIC
On Sat, Apr 17, 2021 at 7:11 PM Jay Dub <bearhawk(at)gmx.com (bearhawk(at)gmx.com)> wrote:

Quote:
--> Kolb-List message posted by: Jay Dub <bearhawk(at)gmx.com (bearhawk(at)gmx.com)>

I'm working on my FS2 I bought partially completed.  The previous owner did a pretty good job on most everything.  However, when inspecting the wings I noticed if I lay a straight edge on the nose of the ribs and the end of the rib (just in front of the rivet) that the straight edge is about 3/32" up above the front spar.  This means there will be protrusions in the fabric at every rib once covered. It sounds like this should have been checked in the building process but got overlooked somehow.
 
Short of unriveting everything off the leading edge spar and either rotating it (which would be weaker due to the holes) or just replacing it by getting the ribs back just a bit more, are the protrusions something I need to fix?  I know I can tape over each one but is there a better way so the protrusions don't poke through the fabric?  I don't feel comfortable taking a cutoff wheel to the rib protrusions as I could easily damage that leading edge spar with a little slip.
 
Jay

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Frankd



Joined: 28 Mar 2008
Posts: 64

PostPosted: Sun Apr 18, 2021 5:11 pm    Post subject: Re: rib/leading edge of front spar gap Reply with quote

Hi Jay,
In the poly fiber covering instructions it says to put antichafe tape over any rivet or protrusion, as the guys recommended. My Xtra has no fabric wear in these places and the rivets certainly protrude. Great question btw.
FrankD
N1014s.


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