S2 6.7 Junk Rig Conversion

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  • 25 Oct 2018 18:20
    Reply # 6873333 on 6872873

    The S2 6.7 is a little smaller than Weaverbird. I have a 22 sq m sail and that is quite enough. 28 sq m would be enormous and way OTT. Junk rigged boats sail downwind faster than bermudan boats because we deploy our area more efficiently - a spinnaker is really a very inefficient sail, area for area. I hope you'll rethink the area.

    "Windward performance is not really of much interest to me." It should be. I don't mean world-beating performance, there's no need for that, but I think you'd be disappointed with a flat sail, for lake sailing. As it's actually easier to make a sail panel-by-panel than the old flat sail method of sewing the whole sail together at once, you might just as well put in a little bit of shape while you're at it.

  • 25 Oct 2018 13:54
    Message # 6872873

    My boat is now stored for the winter with no access until sometime in May of 2019. I am planning to spend the winter drawing and planning the sail. Maybe the mast and tabernacle as well.

    I thought I would start with the 'post the wrong answer to get the right answer' method.

    Sailing down wind with Bermuda rigs has always irritated me. Why should the least technologically advanced point of sail be the most stressful and difficult? Following this line of thinking I got it in my head that I would like my junk sail to have the same sail area as a spinnaker that would normally be used on the boat. I want a big squared off sail for running down wind.

    I have also been persuaded by Kurt Jon Ulmer's 'long bold article' on the merits of flat-cut sails. I have decided that a flat sail with progressive batten angles (some fan) in the panels will be best for me. I am looking for simple, strong and proven. Windward performance is not really of much interest to me.

    I tried to draw some sails using the angles the Kurt describes in his article. 'I might use 10,10,12,14,17,22,60 now.' I did not have much success so I started looking at other sails that had some progressive fan. I was very happy to find the .dxf files for David Tyler's SibLib sailplan in the members area.

    I scaled the sail in his drawing down to 28 sqm (I will be trying very hard to do all work in metric units). I did my best to place it where I thought it looked OK on the line drawing for my boat.

    In summary my first try for an answer is a SibLib sail scaled to 28 sqm, cut totally flat and placed as shown in the attached drawings.

    I ended up with what looks like a BIG stick for a mast. This makes me think my idea is not practical.

    Any helpful advice would be greatly appreciated.


    2 files
    Last modified: 26 Oct 2018 13:59 | Anonymous member
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