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Mast dimensions for Laurin 31

  • 10 Sep 2017 14:56
    Quote
    Reply # 5073005 on 5072767
    Anonymous member

    Yes, I think the 222mm tube will be fine, as you are making it a little shorter, and using a little less sail area.

    Nedal will probably not sell you a single tube directly, but I hope they will put you in touch with a distributor close to you. Here in the UK, we go to Aluminium Lighting Company
  • 10 Sep 2017 14:33
    Quote
    Reply # 5072999 on 5072767
    Deleted user

    Hi David,

    Thank you for your swift reply, it really helps. 

    No, I have not started sourcing anything yet. But I was actually thinking of contacting Nedal for the mast. 

    Do you think the dimensions you mention for your mast would be fine as well?

    Br
    Flemming
  • 10 Sep 2017 09:23
    Quote
    Reply # 5072793 on 5072767
    Anonymous member

    Hi Flemming,

    The mast diameters are OK, quite generous in fact, but do you have a source of supply for a tube of this size? I only know of  the 222mm dia x 5mm tapered tube that I used on Tystie, originally made by Nedal in the Netherlands.

    You can use 50mm x 1.5mm tube for the lower battens, but the top two sheeted battens generally benefit from being stronger.

    The yard will need to be larger than 65mm. Maybe 100mm?
  • 10 Sep 2017 08:35
    Quote
    Message # 5072767
    Deleted user

    Hi All, 

    First, thank you for a fantastic fora, there is just so much information in here.

    I am planning to re-rig my currently ketch rigged Laurin 31. I am currently sketching out the conversion and would really like a sense check on my thinking so far.

    The boat is:
    9.65 loa and 8.6 loa.
    2.88 m wide and 1.6m draft
    Weighs 5.5 ton
    It is a full-keeled double-ender and I intend to use it for off-shore sailing mainly north-atlantic.

    The planned rig would be based on Arne Kverlands Johanna-style seven panel sail.

    I imagine the sail area to be the same as the current rig at 50spm.
    I would be using an AR of 1.95 and a boom-length of 5.7m.
    The h-height of the sail would be 11.1m
    I have added a sketch of the sail in onedrive here: https://1drv.ms/b/s!Aloj3xdWGItiknO2eHknnS2LhrkQ

    I was planning the mast to be of T6 aluminium. 
    The diameter about 24cm at deck level and 12cm in the top.
    Wall thickness about 7mm.
    I imagine the  mast to be 11.4 in total (1.3m below deck, 0.7m above deck, 7.8m sailheight at the mast, and 1.5m above.

    For the battens I was thinking 50mm T6 alumnium with a wall size of 3mm and a 65mm yard.

    Do these measures sounds reasonable or is there something I have overlooked?
    Any ideas or suggestions is more than welcome.

    I live in Copenhagen, Denmark

    Thanks in advance

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

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