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Sheeting Configuration

  • 15 Jul 2015 07:05
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    Reply # 3434395 on 3384965
    Anonymous member

    I have now sailed about 500 nm, mostly in open ocean, with this system.  And Ash is right.  The pull goes to the top batten last but quite soon everything evens out, especially in a sea-way or in a decent wind. PJR says that going to the top batten first is more logical to the western mind; well it is not more logical to my Irish mind!  In short there is no difference in sail trim by using  either method.  I repeat, no difference.  But by sending a single line to the top span you need a slightly shorter sheet.  Anything that reduces cordage on a junk has to be welcomed!

     

    On that thought how do you measure the length of a sheet on a junk given that at sea horizontal distances are measured in feet, yards and nautical miles, vertical distances are measured in metres.  But this is a diagonal distance.  Might I suggest we use chi?
  • 17 Jun 2015 07:42
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    Reply # 3389891 on 3384965
    Anonymous member

    ...as said by Tony & Sally just a few days ago. 
  • 17 Jun 2015 06:25
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    Reply # 3389851 on 3384965
    Anonymous member
    Tsk, Tsk, Anthony.  Ron Glas belonged to Jock, not Blondie!
  • 17 Jun 2015 01:02
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    Reply # 3389669 on 3384965
    Anonymous member

    I have changed the foresail sheet around so that the first pull goes to the top span and will now sail 150 nm to Cairns.  When I arrive I will report on the changes, if any.  I am interested in the news that Blondie Hasler's boat, Ron Glas, had the first pull to the boom span.
  • 16 Jun 2015 10:53
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    Reply # 3388702 on 3384965
    Anonymous member

    Tammy Norie has her original Haslar-McLeod rig from the early 80s and is very much by the book. (She came with photocopied hand drawn diagrams in what I'm told is Blondie's handwriting!) Her sheet goes to the top first and the bitter end is on the boom.

    One reason I like this arrangement is that I'm often sailing in confined places with disrupted wind with the sheet it my hand. I can feel the fluctuations in wind higher up (above river banks and bushes). I think if the sheet were the other way up it would dull this feedback considerably through friction in the system.
  • 13 Jun 2015 16:34
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    Reply # 3385297 on 3384965
    Deleted user

    Hi Anthony,

    'First pull at the top' is designed to initially reduce excessive twist.  

    By having the bitter end at the top batten, (the first pull will be on the boom and lower panels),  then the top batten will be the last part of the sail to react to trim, as friction in the previous blocks will have robbed most of the power by the time the pull reaches the bitter end. However given time and bouncing over a few waves, the friction will have shaken through the blocks and will have equalised loads.

    PJR P. 68  Last para states:

     "Although it might appear from the above that there is nothing to choose between first-pull-at-the-top and  first-pull-at-the-bottom, the former somehow seems right to the western mind and all our recommended sheet systems are so arranged".

    Have you considered a "split sheet system" as per PJR page 71 , to be able to separately control the upper and lower panels and so get optimum trim for the current conditions of wind sheer?

    Yes, more sheets to pull, but you can do one at a time and with less load per sheet; and still able to cast both off at the same time if needing to spill suddenly.

    Cheers 

    Ash

    Last modified: 13 Jun 2015 16:51 | Deleted user
  • 13 Jun 2015 06:07
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    Reply # 3385079 on 3384965
    Deleted user

    Ron Glas also has a standard HM rig with.the same configuration  as yours Anthony.We.are sheeted to the top batten first ie the first pull on the sheet goes to.the.uppermost sheeted batten. This is how we.took over the boat fromJock and it seems to work fine .If it aint broke .............Tony&Sally

    Last modified: 13 Jun 2015 06:11 | Deleted user
  • 13 Jun 2015 01:55
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    Message # 3384965
    Anonymous member

    I have a classic Hasler rig with five horizontal battens and one unsheeted diagonal top batten.   For no good reason the sheets are fitted back to front ie the bitter end is attached to the top sheeted batten and not to the boom, as would be more conventional.

     

    I cannot for the life of me think what difference this makes.  But members may be better at thinking than I am... 
       " ...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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