[NSRCA-discussion] Wing tube phenolic repair "help"

[Nat Penton]

Anthony
How far does the socket go into the wing ? I quit using a false rib years ago but my socket , 1", goes in 18 ins. The tube goes in about 16". The simpliest way to stabilize the socket is with spray insulation foam, one injection hole 3/8 ?and one vent hole 1/8 ?. The kind I have used does not attack styrofoam. It is a fast repair and you have not lost anything if it fails for some reason.
  ----- Original Message ----- 
  From: Anthony Abdullah 
  To: NSRCA Mailing List 
  Sent: Friday, August 11, 2006 3:36 PM
  Subject: Re: [NSRCA-discussion] Wing tube phenolic repair "help"


  Dean,
  I hadn't thought of that, but wasn't that repair kind of heavy? I think it is hilarious that you covered them in yellow!

  I am fairly certain that I will use the false rib from the bottom technique to fix it. I will take great care to cut a uniform slot where the rib fits in snug, particularly around the phenolic. That should provide lots of surface area to transfer the load to the entire foam core wing panel. 

  Next question:
  What should I make the rib out of? Would a balsa rib laminated in carbon fiber be strong enough or should I just go with light ply? Of course weight is an issue. 

  Should I still use Poly glue or would foam safe CA or 30 Minute epoxy be better?

  Thanks again for all of your great suggestions.
  Anthony
  Dean Pappas <d.pappas at kodeos.com> wrote:
    Hi Verne, Hi Anthony,
    I had to do such a fix maybe 14 years back on a Desire 120.
    The foam started to tear away from the tube, just as you describe.
    I poked a 3/4" diameter hole in both sides of the wing just inboard of the end of the tube.
    Then I took a piece of broomstick, sanded a concave to mate to the tube, and carved and sanded the other end to be flush to the top of the sheeting.
    They went in with epoxy.
    Then a pair of 6" long, by 1-1/2" wide 1/32" plywood scabs were glued to the outside of the sheeting like ribs.
    That way, the tube was supported by a 6" wide swath of sheeting, top and bottom, with the load transferred by the broomstick columns.
    I covered the scabs before gluing, and because I wasn't bashful, I covered them bright yellow which was not present anywhere else on the plane.
    I think it was '92.
    Dean


    Dean Pappas 
    Sr. Design Engineer 
    Kodeos Communications 
    111 Corporate Blvd. 
    South Plainfield, N.J. 07080 
    (908) 222-7817 phone 
    (908) 222-2392 fax 
    d.pappas at kodeos.com 
      -----Original Message-----
      From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Verne Koester
      Sent: Friday, August 11, 2006 10:33 AM
      To: NSRCA Mailing List
      Subject: Re: [NSRCA-discussion] Wing tube phenolic repair "help"


      Anthony,
      There should be a false rib near the end of the socket, usually made out of 1/8 lite ply. If there's not one there, you need a new set of wings unless you can figure out a way to put one in there after the fact.

      Verne
        ----- Original Message ----- 
        From: Anthony Abdullah 
        To: NSRCA Mailing List 
        Sent: Thursday, August 10, 2006 10:42 PM
        Subject: [NSRCA-discussion] Wing tube phenolic repair "help"


        I was just about finished setting up my Odyssey when I noticed that the wing seemed a little loose. If I hold the fuselage the right wing panel can wiggle up and down a noticable amount. I thought that maybe the tube mount at the fuse was loose but that was not the case. As it turns out, the phenolic in my completed wing is loose about 3/4 of the way down and is wiggling around. It almost feels like the foam in the sheeted foam core wing has been somehow dislodged and the phenolic is in just a hollow cavern instead of solidly glued to the wing. It is still glued solid at the root so it won't slide out, but it obviously can not be flown in that condition.

        Question:
        How do I go about repairing the foam that the phenolic mounts to? The wing is sheeted, covered, and trimmed (complete) and I would like to keep from having to start all over again. Getting out the old one will also be an issue as it is still partially glued in. 

        I am open to any and all suggestions.

        Thanks in advance
        Anthony   

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