Horizontal Stabilizer in molds

Building Concordia-The Horizontal Stabilizer

5 responses

  1. Craig Funston
    January 26, 2011

    I'm curious about the advantages of kevlar vs. carbon or glass for this particular part. Kevlar has low density and modulus with high toughness. I'm assuming that the higher modulus of carbon isn't an advantage in this case.


    Craig Funston

  2. Gerhard Waibel
    January 30, 2011

    Dear Craig,

    there is a mixup with pictures and sub-titles of above article.

    If you look closely to the stabilizer photo, you can see, that the balsa is vacuum-bag glued to the outside skin.

    This skin is black from carbon weaving and from yellow Kevlar,which you may not spot, as an outermost layer. This Kevlar-layer is very lightweight and rather stiff in twist.

    Such a light weaving was not available in Carbon.

    You are right, that Kevlar is tough. But Kevlar 49 has quite a high modulus and is lighter in density than glass and therefore beats even the thinnest glass layer.

    When you look to the photo with Karl Klossok and me, you see elevator outside skins and the balsa core covered by a felt fleece

    for absorbing surplus resin under the vacuum bag.

    As you can see on the stabilizer photo taken at TN, only the elevator is a pure Kevlar-Balsa-Kevlar sandwich structure.

    Kind regards,


    • Craig Funston
      February 2, 2011

      Thanks Gerhard,

      I hadn't realized that Kevlar was available with a higher modulus. It's a beautiful project and we're wishing you and the team great success.


  3. Jim Acketoft
    January 31, 2011

    Very interesting project, I´m looking forward to seeing more.

    Good luck and best wishes from (Sweden W22 220037)

Leave a Reply

mobile desktop