fiberglass mesh in foam wings

[John Ferrell]

"The trick is knowing when the nice balance in properties has been reached."
I like this answer best. 

John Ferrell    
http://DixieNC.US

  ----- Original Message ----- 
  From: Rcmaster199 at aol.com 
  To: discussion at nsrca.org 
  Sent: Tuesday, December 21, 2004 5:00 PM
  Subject: Re: fiberglass mesh in foam wings


  Carbon Fiber mat or veil, in substantial weight rating, will absorb a great deal of glue. The only reasonable way to do a carbon veiled wing is as Jerry suggests, to roll out practically all the glue and vacuum bag it. 

  Be that as it may, in my experience it is an unecessary weight addition. Sure it adds stiffness but for what purpose? These models are not jets or racers that need to be strong at 200+mph. A little more flexibility in the wing is not a bad thing for pattern models. The trick is knowing when the nice balance in properties has been reached.  

  MattK


  In a message dated 12/21/2004 3:48:58 PM Eastern Standard Time, Richard.Fletcher at gs.com writes:
    The most expensive solution in this case I believe is the best. CF mesh from Aerospace Composites.


    Thanks, Rich 



      -----Original Message-----
      From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org] On Behalf Of John Ferrell
      Sent: Tuesday, December 21, 2004 3:35 PM
      To: discussion at nsrca.org
      Subject: Re: fiberglass mesh in foam wings


      Sounds good to me. There are a lot of ways that work well.
      BTW, some of the drywall mesh is made with very short fibers: if you can tear it easily, don't use it.
      Pattern flyers will prefer the most expensive solution. I think that is a paraphrase of something Dick Hanson said...

      John Ferrell    
      http://DixieNC.US

        ----- Original Message ----- 
        From: Jerry Stebbins 
        To: discussion at nsrca.org 
        Sent: Tuesday, December 21, 2004 12:37 PM
        Subject: Re: fiberglass mesh in foam wings


        John, we put 0.5 oz carbon mat between the foam and sheeting, same amount of slow epoxy ( really thin rolled on to the mat ), with a little brushed around the edges of the foam, and bag them. Gives an incredibly strong wing,almost monocaque, with little added weight. Also add a small piece at fuse end TE to prevent the "pick up bends" .
        Jerry
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