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  • Cap Strip measurement issue

    Guys,

    I was working on my cap strip order today and found a mistake I made when making my center ribs. I made each rib to length, all of the ribs are a 1/8 short on the rear to accommodate the full length cap strip on the rear spar and the front is either full length, 1/8, or 1/4 short depending on where it sits on the front spar. So far so good...

    Well today I found my mistake, I made the #2 center rib 1/8 too short because I mis-read the plans (like that never happens) and falsely assumed the rear cap-strips would be doubled up at the root, I don't know what I was thinking as it is crystal clear now as I look at the plans again....anyway, this is the only rib that is too short (two of them). So I figure I have 3 possible fixes:

    1: Make a new rib(s) to the correct size.
    2: Double up the vertical shim for this position, like what we do when you have a 1/4 cap on one side and a 1/8 on the other, the exception would be it would extend over both top and bottom caps.
    3: Make the rear cap strips extend all the way to the root (which I obviously thought was the case in the first place).

    I am a HUGE fan of solution #2, with #3 my second choice....I really, REALLY don't want to make two new ribs....

    What do you guys think? How does one get a engineering variance?

    Please Advise on how to proceed...

    Thanks guys!


    Ps....lets all vote for #2!
    Dave Bottita The Desert Bearhawk
    Project Plans #1299
    N1208 reserved www.facebook.com/desertbearhawk/

  • #2
    Guys, I just had the pleasure of talking to Mr. Barrows, what a great guy! He advised me that this is not an issue and I can just make a slightly larger attach angle and space the rib as needed. Looks like its a non issue!
    Dave Bottita The Desert Bearhawk
    Project Plans #1299
    N1208 reserved www.facebook.com/desertbearhawk/

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    • #3
      Glad that worked out for you. Bigger attach angles was going to be my guess, but it's best not to guess at that stuff as an engineer :-) Anyway - 1/8th doesn't seem like a 'gaping' structural gap provided you have a good tight-fitting attach angles that can bridge it and transfer the loads to the spar, glad to hear Bob ok'ed the fix - that'll save you some hassle.

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      • #4
        Hi All , We should have an `OOPS` thread running

        When you get round to the spars ,make sure you start with the end attach plate sitting on the spar completely ,as in erics manual -for some reason I clamped them overhanging the square edge of the spar 1 3/16 and then proceeded to mark out the rib stations and cut the lightning holes - DOH


        Just in the process of remaking them
        Paul Dennington plans #1257

        scratch built 4 place

        England

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        • #5
          Ouch. . . .. I'll keep that one in mind when I get there. ~Todd

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