[NSRCA-discussion] [SPAM] Re: Wing Construction

[Earl Haury]

Nat

I tried the double sided tape years ago. The surfaces must be very clean for it to work, even then the stuff didn't last and was heavier than epoxy. Having tried most of the popular adhesives and tested them for strength, epoxy and poly-u are the only products I consider acceptable. I've found that the poly-u produces a "wavy" wing surface after a couple of years. Not de-adhesion but (apparently) continued expansion? Anyway, epoxy provides the strongest, lightest, most durable skin adhesion (in my experience).

Earl
  ----- Original Message ----- 
  From: Nat Penton 
  To: NSRCA Mailing List 
  Sent: Wednesday, November 07, 2007 2:36 PM
  Subject: [SPAM] Re: [NSRCA-discussion] Wing Construction


  I have  double sided wing tape, about 4" wide - used for attaching wing skins - that has never been used. Any recollections regarding this stuff ???

  I could do a sample to determine weight. Am wondering about tenacity and longevity ???  Nat 
    ----- Original Message ----- 
    From: rcmaster199 at aol.com 
    To: nsrca-discussion at lists.nsrca.org 
    Sent: Wednesday, November 07, 2007 8:21 AM
    Subject: Re: [NSRCA-discussion] Wing Construction


    The few grams one would save by not applying glue to the skins in the open bay areas isn't worth the hassle, in my experience.

    I use the roller for skinning and apply a lite even coat to the sealed skin and then use the residual wetness on the roller to touch the foam. It helps produce a more even, more consistent joint. Skins are sealed using a lite-med coat of hairspray. I have also used nitrate dope for sealing which works extremely well, except I wait 2 days to fully flash the solvent.

    A quick point on wing weight.... my 500 sq inch panels usually work out to weigh around 8.5-9.0 ozs each ready to cover. With reasonable technique, the panels come in at around 13 to 13.5 ozs, fully painted and ready for servo and linkage. There just isn't much more weight savings to be had in wing construction. That's one reason why I usually concentrate my weight savings approach to the fuse. The fuse often offers much greater opportunity for savings than wings do. I often measure the weight savings in ounces, not grams, when constructing the fuse.

    regards,
    MattK






    -----Original Message-----
    From: Karl G. Mueller <kgamueller at rogers.com>
    To: NSRCA Mailing List <nsrca-discussion at lists.nsrca.org>
    Sent: Wed, Nov 7 8:55 AM
    Subject: Re: [NSRCA-discussion] Wing Construction


    Lance,

    Do you apply the glue to the skins or to the foam core in case of a
    cored (with cut-outs for weight saving) foam core. I thought that the
    amount of glue spread on the skins in the areas that do not make 
    contact with the foam would be unnecessary weight. It will strengthen
    the skin some.

    Karl G. Mueller
    kgamueller at rogers.com

      ----- Original Message ----- 
      From: Lance Van Nostrand 
      To: NSRCA Mailing List 
      Sent: Tuesday, November 06, 2007 11:13 PM
      Subject: Re: [NSRCA-discussion] Wing Construction


      Foam roller, my friend.  a squeegee will force resin into the pores and away from the joint.  Only a roller applied fast and light can meter the material properly and keep in on the surface.
      --Lance

        ----- Original Message ----- 
        From: Nat Penton 
        To: NSRCA Mailing List 
        Sent: Tuesday, November 06, 2007 9:32 PM
        Subject: [NSRCA-discussion] Wing Construction


        To skin a foam core with contest grade balsa does anyone have a preferred way to determine when the amount of epoxy applied is adequate - using Easy Lam epoxy. I have been reluctant to use a squeegie, afraid of scoring the balsa. Would appreciate any comments.                            Nat

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