Junk Rig for a dinghy

  • 23 Jan 2020 13:24
    Reply # 8659656 on 8653668
    Anonymous member (Administrator)

    James,

    I agree with David that making your own sail is the way to go.
    The mast for my 5.5m Broremann’s (10sqm) sail came out on exactly 10kg. An all-aluminium mast should come out 2-3 kg lighter, and thus be quite easy to raise manually and plonk into position, at least with the boat on the hard.

    As for choice of tabernacle, I think that depends on how you are to keep the boat. If it is to sit on a trailer between the trips, one must make use of the easiest methods for handling the furled sail bundle. One method is to use a stub of tube for tabernacle, just tall enough to end about 10cm below the boom, when the sail is rigged. Before the mast is lowered after a sail, the sail bundle, batten parrels and all, can be lowered onto that stub before lifting out the mast. This shortens the time to make the boat ready, both before and after a sail trip.

    Good luck,
    Arne

    Broremann's sail, part one

    Broremann's sail and new mast, part 2


  • 23 Jan 2020 13:20
    Reply # 8659630 on 8653668

    Thanks for your reply, David.

    I've had the idea of taking one of Arne's drawings, and removing the bottom two panels to make a 12.93m2 (139ft2) low aspect sail. Has the advantage of only needing a 4.8m mast, and the shop down the road sells cheapish timber in 4.8m lengths. Might also be able to get my hands on a 5m aluminium pole quite cheaply, too.

    I'm not too fussed about super performance- this boat is for dinghy cruising the Trondheimsfjord on nice days with my son. So long as it CAN make progress to windward, I'm happy ;)


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  • 23 Jan 2020 10:45
    Reply # 8658676 on 8653668

    A nice-looking dinghy, James.

    1. Yes, a forward opening tabernacle just forward of the daggerboard case looks good to me.
    2. I have a 11ft 6in dinghy which has had a junk sail in the past (front cover of JRA Newsletter 31)  I kept it simple, with one less panel than Hum. The panels have a little barrel camber sewn in.
    3. Make the sail yourself - a quick and easy job with a domestic machine and lightweight cloth! A professional sailmaker wouldn't do it as well.
    Last modified: 23 Jan 2020 10:46 | Anonymous member
  • 22 Jan 2020 20:31
    Message # 8653668

    Hi everyone- I'm thinking of converting the pictured dinghy to JR. Normally, it has a 100sq.ft sail area. But how best to go about it?

    I have an idea for a tabernacle and so on. This would be placed just forward of the daggerboard case. My Plan A is to copy the "Hum" design from Practical Junk Rig, resize it to 100sq.ft, and place it as described. I do wonder, though, whether it'd be possible to get the CE/CLR right with the mast in that position. I have converted a dinghy to JR before using the "Hum" design, and the results were satisfactory :)

    What I'd be grateful to receive in this thread:
    (i) Opinions on whether this mast placement is likely to work (I will of course be calculating CE/CLR etc. myself)

    (ii) Suggestions for better sail types than that of "Hum"

    (iii) Suggestions for sails that I can simply buy from sailmakers/JRA members that are likely to work here and save me the hassle of making my own sail :P

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