S2 6.7 Junk Rig Conversion

  • 20 Oct 2020 21:14
    Reply # 9315567 on 6872873

    Sorry, Scott, I don't like the specification of this tube:

    "This fiberglass tube is made by the pultrusion process. Fiberglass (random directional) mat, pulled via hydraulics through a bath of resin and pigment. Heated and cured. "

    The fibres should be almost all longitudinal, to give maximum stiffness, with preferably a little diagonal braid in the layup to provide hoop strength. You can see this in the tubes that I buy from my preferred supplier. Random directional mat is not suitable for making structural tubes to withstand bending loads.


  • 20 Oct 2020 20:25
    Reply # 9315461 on 6872873

    I could use some help. I think my battens are too flexible. The tubes I glued together for the yard and for the upper most sheeted batten (larger than the others) seem good to me.

    The others seem to bend significantly under their own weight.

    Is anyone willing to guess if the batten I have shown in the photo might be acceptable? If I am going to re-work it I would rather do it at the house and not after it is rigged on the boat.

    The photo shows a one inch pultruded fiberglass tube glued inside a 1.25 inch tube. The wall thickness is 0.125"

    David: Thanks for the information about melting epoxy. I ended up gluing on a second 'hinge' for now. I still need to cut or melt the first one off somehow.

    3 files
    Last modified: 20 Oct 2020 20:34 | Anonymous member
  • 02 Sep 2020 06:21
    Reply # 9206303 on 6872873

    Hi Scott, the 250 to 300 centigrade is the heat gun temperature, the epoxy will fail at around 100 centigrade. This is well below the temperature that may effect the temper of the Aluminium which is between about 180 and 220 degrees centigrade.

    All the best, David.

  • 01 Sep 2020 21:28
    Reply # 9205296 on 9179655
    David wrote:

    [...] application of heat to the stainless will release the joint. A normal heat gun is usually adequate, you need about 250 to 300 degrees celsius.[...]

    It is epoxy to 6063-T6 aluminum.

    Do I need to worry about messing up the temper of my mast by heating it with a heat gun?

  • 01 Sep 2020 21:26
    Reply # 9205291 on 9199652
    Annie wrote:

    [...]Did you sort out the "hinge"?[...]

    Nope. Not yet. I need to decide how to re-work my first failed attempt at a hinge.
  • 30 Aug 2020 09:39
    Reply # 9199652 on 6872873

    Mine looks huge, too.  But on Speedwell, you don't even notice it, with the mast in and the sail on.  If you sail with junk rig, you have to get used to people making comments about your weird boat.  I've decided to paint my tabernacle aqua.  If you've got it, flaunt it!

    Did you sort out the "hinge"?

  • 30 Aug 2020 02:46
    Reply # 9199239 on 6872873

    Hi Len,

    Thank you for the encouragement. The first time I am able to tack by just putting the tiller over I expect everything will suddenly look great.

    Scott

  • 30 Aug 2020 02:42
    Reply # 9199222 on 9196191
    Anonymous wrote:

    I kept telling myself that this big box I was building would look less strange after it was mounted on the boat. Yesterday I dry fit the tabernacle. It still looks like a big box.



    I think it needs a mast to look right... I would imagine the first ever sail looked strange compared to a paddle too. Generally what works well, looks right pretty quick.
  • 28 Aug 2020 16:32
    Reply # 9196191 on 6872873

    I kept telling myself that this big box I was building would look less strange after it was mounted on the boat. Yesterday I dry fit the tabernacle. It still looks like a big box.


    1 file
  • 23 Aug 2020 19:06
    Reply # 9185663 on 6872873

    I am a little happier with how the mast head is going. All the holes were drilled over-sized, filled with epoxy and re-drilled. 

    I think I ended up with something strong enough, possible to modify later, and somewhat light weight.


    3 files
       " ...there is nothing - absolutely nothing - half so much worth doing as simply messing about in junk-rigged boats" 
                                                               - the Chinese Water Rat

                                                              Site contents © the Junk Rig Association and/or individual authors

Powered by Wild Apricot Membership Software