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Thread: Tailing Edge Rib Alignment

  1. #1
    Junior Member
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    Sep 2018
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    Alanson, MI
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    Default Tailing Edge Rib Alignment

    I have a concern with my tailing edge rib installation on my EX-3 kit, Section 21 of the Wing manual. After drilling, dimpling and riveting the top/bottom/side, the result is that the tailing edge rib is no longer straight with the center rib. I have done 3 ribs so far, even using a square to hold the rib in place. All three are slightly out of alignment.

    When I flex them straight with a light push, there is a small deflection in the center rib.

    Is there a way to keep these tailing ribs perfectly aligned? Is this a real issue? Maybe this will fix itself when the false spar or cap strips are installed later?

    Thanks, Pete20191030_171613350_iOS.jpg20191030_171623450_iOS.jpg20191030_171635752_iOS.jpg

  2. #2
    Junior Member
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    Oct 2018
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    Idaho
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    16

    Default Re: Tailing Edge Rib Alignment

    I have this on some of my trailing edge ribs as well. I just finished putting on my false spars a few weeks ago and drawing a line with your sharpie down the center of the ribs and tweaking them a little side to side before drilling helped the alignment. The center rib deflection seems barely noticeable. I cannot imagine it being an issue beyond aesthetics.

  3. #3
    Senior Member
    Join Date
    Jul 2015
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    Broken Arrow, OK
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    532

    Default Re: Tailing Edge Rib Alignment

    Yes, donít worry about that now, you did it right. The false spar has pre-drilled holes and you will align the tail ribs with these holes before drilling. Check out post #11 here

    http://forum.cubcrafters.com/showthr...p-Hints/page15

    Quote Originally Posted by Peter A View Post
    I have a concern with my tailing edge rib installation on my EX-3 kit, Section 21 of the Wing manual. After drilling, dimpling and riveting the top/bottom/side, the result is that the tailing edge rib is no longer straight with the center rib. I have done 3 ribs so far, even using a square to hold the rib in place. All three are slightly out of alignment.

    When I flex them straight with a light push, there is a small deflection in the center rib.

    Is there a way to keep these tailing ribs perfectly aligned? Is this a real issue? Maybe this will fix itself when the false spar or cap strips are installed later?

    Thanks, Pete20191030_171613350_iOS.jpg20191030_171623450_iOS.jpg20191030_171635752_iOS.jpg
    Dave Embry
    "You only live once.....
    ..but if you do it right.....
    ....once is enough."..

  4. #4
    Junior Member
    Join Date
    Sep 2018
    Location
    Alanson, MI
    Posts
    2

    Default Re: Tailing Edge Rib Alignment

    Fantastic, thanks for the reassuring comments! I'll proceed....

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