SibLim update

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  • 16 Apr 2018 07:58
    Reply # 6100705 on 6100633
    Annie Hill wrote:
    David Tyler wrote:

    But, but, but...

    I made the drawing back in January last year. It lacks dimensions, that's all.


    I dare say you did, chuck.  But I can't find that drawing anywhere in my files!  Dimensions wouldn't go amiss ;-) if you could manage them. 
    These might save a bit of time with the rudder leading edge:

    http://www.windknife.com/full-foil 

    Cheap enough for what they are but I have not used them myself.

    Even the "nose only" section may not be big enough enough though.

    Not sure I am terribly impressed with their asym section, and its hard to see that nose scaling to an 800 mm chord.

    Then again David's asym foils would be dead easy to construct and those box sections look pretty strong to me.



  • 16 Apr 2018 06:16
    Reply # 6100634 on 6100231
    Arne Kverneland wrote:

    There seems to be a problem with the new WA files section. I have yet to see any text following any diagram or photo. I think I'll stick to my member's photo album until WA fixes that....

    Btw,the rudders looks good, except that the full-dept skegs prevent the use of balanced rudders.


    I'll trade a balanced rudder against getting a rope caught between a partial skeg and the rudder!  Each to his own.
  • 16 Apr 2018 06:15
    Reply # 6100633 on 6100223
    David Tyler wrote:

    But, but, but...

    I made the drawing back in January last year. It lacks dimensions, that's all.


    I dare say you did, chuck.  But I can't find that drawing anywhere in my files!  Dimensions wouldn't go amiss ;-) if you could manage them. 
  • 15 Apr 2018 23:06
    Reply # 6100231 on 4315719
    Anonymous member (Administrator)

    There seems to be a problem with the new WA files section. I have yet to see any text following any diagram or photo. I think I'll stick to my member's photo album until WA fixes that....

    Btw,the rudders looks good, except that the full-dept skegs prevent the use of balanced rudders.

    Last modified: 15 Apr 2018 23:06 | Anonymous member (Administrator)
  • 15 Apr 2018 22:57
    Reply # 6100223 on 4315719

    But, but, but...

    I made the drawing back in January last year. It lacks dimensions, that's all.

    Last modified: 15 Apr 2018 23:01 | David
  • 15 Apr 2018 21:31
    Reply # 6100174 on 6099721
    David Tyler wrote:I think it's a different situation for the rudders. Annie has a pile of timber suitable for laminating them in three layers, and there's less shaping to do than for the bilgeboards.
    Ah, that's interesting. I was vaguely wondering if the rudders have been designed, or if I'm going to be doing them myself.  At least I have a clue, now ;-)
  • 15 Apr 2018 08:13
    Reply # 6099721 on 6099670
    David Thatcher wrote:

    Are the bilge boards going to be solid timber? That little design I have been looking at has the daggerboards and rudder blades fabricated out of plywood bent around internal formers and a center solid longitudinal. This seems a much more sensible way of making these rather than starting off with a solid block of timber and then planing a large proportion of the timber away as waste.

    Way back, before I left NZ, I made a drawing of the bilgeboard like this. The outboard surface is 12mm flat plywood, and several longitudinals are glued onto it. Then two layers of 6mm plywood are bent over the longitudinals, and a solid radiused nose is glued on and shaped up. Yes, this is a better way of making them, reducing the weight to be hauled up and making the boards less likely to warp.

    I think it's a different situation for the rudders. Annie has a pile of timber suitable for laminating them in three layers, and there's less shaping to do than for the bilgeboards.

  • 15 Apr 2018 05:45
    Reply # 6099670 on 6099574
    Annie Hill wrote:

    In spite of the AGM, I've made more progress on the boat.  Fitting out is great fun.  I'm looking forward to putting on the deck, too, but confess to wishing I could farm out the rudders and bilgeboards.  I'm not worried about doing them particularly, but don't find this type of woodwork anywhere near as exciting as the accommodation!


    Are the bilge boards going to be solid timber? That little design I have been looking at has the daggerboards and rudder blades fabricated out of plywood bent around internal formers and a center solid longitudinal. This seems a much more sensible way of making these rather than starting off with a solid block of timber and then planing a large proportion of the timber away as waste.
  • 15 Apr 2018 04:26
    Reply # 6099574 on 4315719

    In spite of the AGM, I've made more progress on the boat.  Fitting out is great fun.  I'm looking forward to putting on the deck, too, but confess to wishing I could farm out the rudders and bilgeboards.  I'm not worried about doing them particularly, but don't find this type of woodwork anywhere near as exciting as the accommodation!

    I've decided to try using the new WA gizmo of attaching files, rather than my photo album for people to see where I'm at.  If nothing else, it's a lot quicker for me.


  • 03 Apr 2018 08:47
    Reply # 6012529 on 6010686
    Annie Hill wrote:


    I'm planning to add a lot of decoration to the lute, so hope it will end up in keeping. These little aesthetic details have nothing to do with the boat's efficiency, but are ludicrously important to the besotted builder!


    And this is what makes the difference between the new 'all white on white' European imported yachts and a craftsman built, (with the aid of gap-filling epoxy!), boat which has character and charm. It s very similar to the difference between the 'handmade houses' movement and the stuff they churn out as houses these days. I don't know how people can find inspiration living in a clinically white box. 
    Last modified: 05 Apr 2018 08:24 | Anonymous member
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