[NSRCA-discussion] Reparing a de-laminated ARF wing

[Ed Alt]

John:
Thanks for the tips.  Actually, it's not a botched repair, it's an ARF wing that came this way.  I agree about the poly-U pressure being a potential problem.  It would require having the original shucks or something close to it.  Maybe it would work with some other foam shucks and placing a towel or something in between to fill the shape mismatch?

Ed
  ----- Original Message ----- 
  From: John Ferrell 
  To: NSRCA Mailing List 
  Sent: Saturday, December 30, 2006 3:47 PM
  Subject: Re: [NSRCA-discussion] Reparing a de-laminated ARF wing


  I would be inclined to slit it open whatever it takes and pump some laminating epoxy in through a flattened brass tube. The poly adhesive might generate enough pressure to make the condition worse. An ear syringe will generate the pressure to load/unload the tube. 

  A CA repair in the area or over zealous cleaning (brake cleaner?) sometimes dissolves underlying foam. I hope this is not the case!

  John Ferrell    W8CCW
  "My Competition is not my enemy"
  http://DixieNC.US

    ----- Original Message ----- 
    From: Ed Alt 
    To: nsrca-discussion at lists.nsrca.org 
    Sent: Saturday, December 30, 2006 3:27 PM
    Subject: [NSRCA-discussion] Reparing a de-laminated ARF wing


    I'm looking for a good method for repairing an area of of sheeted foam wing where it is not fully adhering, roughly 30 sq" in area.  Current thoughts are to try to inject some polyurethane glue just under the surface, maybe a laminating epoxy instead.  The tough part seems to be how to get sufficient coverage right under the skin without going too deep.  The wing is already covered and I'm thinking that one method might be to use a suction cup and gently pull the skin away to assure a gap so that a needle would get the glue in between.  Any thoughts on this?

    Thanks

    Ed 


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