Battens with horizontally rotating tails.

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  • 02 May 2013 01:29
    Reply # 1283364 on 1261013
    Deleted user
    Thanks Paul,
    Must have been a typo or I just read it wrong.
  • 01 May 2013 21:19
    Reply # 1283237 on 1282704
    Pete Rasmussen wrote:David Tyler mentioned a 30:1 ratio for his halyards and I wonder how this is set up, not having seen such a device.  With one mast I would need the battens to be around 7 metres long and this should work out ok with room for the sheets.  Thats one huge sail though and I wonder if it will handle easily.

    Pete, it's a 3:1 ratio. See Davids comment under Peter's Mallimac thread. I use the same system on LC and it works well. I can host my foresail 25 Sq.M with ease and my main 38 Sq.M is just doable. From the Pramhood however, I do need the winch.
  • 01 May 2013 08:52
    Reply # 1282704 on 1261013
    Deleted user
    Thanks Annie,
    Yes I mentioned to Robert aboard Peace Haven that it would be a good idea to join the JRA and he agreed.  I'll pass on your kind invite to him. 
    I may be able to get a Lawson Cyprus here in Gisborne with a bit of persistence and luck.  Arne's description on how to go about building a mast from a tree trunk is a great encouragement.  I'll bide my time and see how it all comes about.  The "hyspan" stuff is double the price of using Douglas fir or Yellow Cedar so that ideas in the bin.  Roughly $900 NZ for joinery grade timber for a 13 metre by 250mm at partners mast.

    David Tyler mentioned a 30:1 ratio for his halyards and I wonder how this is set up, not having seen such a device.  With one mast I would need the battens to be around 7 metres long and this should work out ok with room for the sheets.  Thats one huge sail though and I wonder if it will handle easily.
  • 30 Apr 2013 06:43
    Reply # 1281725 on 1261013
    Suggest that the new owners of Peace Haven (a) join the JRA and (b) stop by in Whangarei Harbour.  mehitabel  is still lurking down the bottom end and I will be based here for a while.  Either or both of us may be able to help them.

    Have you tried the Dunedin (or was it Invercargill) City Council?  One of other of them has a forest of spruce trees planted for building planes in the Second World War.  (They were either anticipating a very long war, or WWIII!)  I think Lex Hodgkinson knew something about them.  There was a rumour that the lot were going to be clear-felled, but it may not yet have happened.  They would be perfect for you.
  • 29 Apr 2013 06:27
    Reply # 1280889 on 1261013
    Deleted user
    For your interest Annie, met the new owners of Peace Haven just this morning.  Youngish couple living aboard and on their way to the Bay Of Islands.  they need help with rigging and handling a Junk Rig as they have not much experience with her.
  • 29 Apr 2013 06:23
    Reply # 1280888 on 1261013
    Deleted user
    Thanks Annie,
    Even better.  I was under the impression a bit of flex in the mast made the "ride " more comfortable.  Using this material the mast should be very rigid if left at 45mm thick planks.
    I think the weight should be acceptable.  This is so cool, I can go to my local Carters and order these planks on my building account and get them delivered to the door!  I'm struggling to find a tree!  Using this Hyspan stuff I can get a wide plank and then turn each stave the opposite way and that way have very little waste.
  • 29 Apr 2013 05:00
    Reply # 1280869 on 1280862
    Pete Rasmussen wrote:I think they would need tapering in thickness towards the top of the mast to get some flex into it.
    The general idea of tapering the masts is to reduce weight and windage, but they are most certainly not meant to flex.  All the spars are supposed to be stiff and rigid.  Generally speaking, any shape in the sail is created by putting in camber, fanning the sail, and/or rigging the sail to allow some twist.
  • 29 Apr 2013 04:47
    Reply # 1280862 on 1261013
    Deleted user
    I'm considering using Hyspan pine planks to make a mast from.  These are radiata pine, laminated from rotary cut veneer , building planks!  I can get them up to 13 metres long!
    According to the manufacturers engineer they are stronger and stiffer than pine f7 f10 building grade timber, so very strong indeed.  Here's a link ...http://www.chhwoodproducts.co.nz/hyspan/
    These are 45mm thick and can be had from 150mm to 600mm wide.
    I think they would need tapering in thickness towards the top of the mast to get some flex into it.  May even need to be reduced in thickness all the way along actually, being so strong.  600 kg per cubic metre is also a bit heavy but I feel Balaena Bay needs some weight in her mast to slow her action in beam seas.  Did a rough calculation and should be around 120 kg.  I say rough calculation.

    At this time a split Junk Rig is appealing, thanks for the advice David. 
    Last modified: 29 Apr 2013 06:17 | Deleted user
  • 23 Apr 2013 22:33
    Reply # 1276891 on 1275204
    Deleted user
    Pete Rasmussen wrote:Well I had a good go at getting to the Junket but a couple of gales on the nose slowed us somewhat and then hid in a corner while a really mean low went by.  That East Cape is mean!  I was 50 miles off and still wind over current.  5 gales in ten days and I'm now home licking my wounds!
    Pete has written more about this in Annie report on the recent New Zealand junket. You can download the pdf from the post in the 'New Articles' section on the members' home page.
  • 22 Apr 2013 23:34
    Reply # 1275204 on 1261013
    Deleted user
    Well I had a good go at getting to the Junket but a couple of gales on the nose slowed us somewhat and then hid in a corner while a really mean low went by.  That East Cape is mean!  I was 50 miles off and still wind over current.  5 gales in ten days and I'm now home licking my wounds!
    I was wishing for a Junk rig the whole trip as it would have been so much easier to sail.  I found Balaena bay to have a much too lively motion probably due to being designed originally for a timber mast but now having an aluminium mast.  Fine under a lot of sail but when reefed down with just a jib she get a lot of sharp motion which is uncomfortable.
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