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pvc battens

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  • 24 Jun 2020 08:16
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    Reply # 9056418 on 7985090
    Anonymous member

    If you read his book, Parker uses a wood core for his PVC battens, so they are a composite PVC/wood batten. This appears to work for his designs.
  • 24 Jun 2020 06:31
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    Reply # 9056315 on 9053133
    Deleted user
    Anonymous wrote:I hope this thread isn't too old for revival, but I wondered what the thoughts of the forum might be on the use of pvc battens in a split-  or aerojunk rig, where the structure of the batten frames might counteract the bendiness problem.

    Has anyone tried it?

    No one else has responded to this so I will say something. I have had PVC battens in the original format of a junk rig boat I purchased. They were pretty bad because of their extreme tendency to bendiness. If PVC was pre-bent around batten frames they might provide some stiffness, but then you would have attachment issues to the rest of the frame components. I think aluminium, or a light weight timber such as cedar would be a much better choice.
  • 22 Jun 2020 23:20
    Quote
    Reply # 9053133 on 7985090
    Anonymous
    I hope this thread isn't too old for revival, but I wondered what the thoughts of the forum might be on the use of pvc battens in a split-  or aerojunk rig, where the structure of the batten frames might counteract the bendiness problem.

    Has anyone tried it?
  • 23 Oct 2019 18:36
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    Reply # 8073698 on 7985090
    Anonymous member

    Bonjour

    My answer was limited to my experience about flexible battens on the forward part of a junk sail. In fact, they were not PVC tubes but GRP rods.

    To confirm that PVC tubes may be an option for JR battens ; MingMing had some PVC tube battens, for 30 years, reenforced with hard wood in the forward part. They worked as the wooden battens described in PJR.

    The flat sail remains very flat on the first forward part of the sail, to prevent S-bending.

    Eric

    PS : You may find in the "télégram" article a nice view of a S-bending on Mingming in a scall... during the Semaine du Golfe.  MingMing - www.letelegramme.fr 

    Last modified: 23 Oct 2019 18:39 | Anonymous member
  • 20 Oct 2019 14:57
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    Reply # 8066993 on 7985090
    Anonymous member

    I attached the Parker article as a FYI that PVC battens work in terms of strength and longevity. I was not saying that the article was how to do junk rig battens but a good resource for some lateral thinking.

    That said, Parker has designed several junk rigs that do use PVC battens  which, I suspect, work just fine and might be of interest.
  • 20 Oct 2019 10:58
    Quote
    Reply # 8066890 on 8062692
    Anonymous member
    Anonymous wrote: The Ruel Parker type battens could work in a conventional flat junk sail, allowing a bit of curvature in the fore part of the sail, but keeping the sail flat towards the leech providing a camber like shape to the sail. It would be interesting to see how this worked on a junk sail.

    Bonjour

    It doesn't work !

    As it is explained in PJR, the forward part of a junk rig batten must be very stiff, otherwise you will suffer S-bending : a hell.

    I experienced that, by mistake, on Mingming and it is really not plaesant, the flow becomes turbulent at the luff and the center of effort moves forward. It becomes almost impossible to tac.

    There is no way, I think, to provide camber in the forward part of a flat junk sail.

    Eric

    Last modified: 20 Oct 2019 11:00 | Anonymous member
  • 18 Oct 2019 05:32
    Quote
    Reply # 8062692 on 7986893
    Deleted user
    Anonymous wrote:

    Reuel Parker has been using PVC battens in his various designs (including junk rig) for decades with very good r results.  His basic approach is to fill the aft 60% of the batten with wood.


    I've been using the same idea but with an added piece of PVC pipe one size down replacing the wood insert. This seems to work finestkind.

    Those battens would be good for a bermudan rig where there is camber in the sail, with the battens being a bit bendy in the forward portion of the sail, but with the stiffening timber more rigid in the aft part of the sail where some flatness of the sail is needed. 

    On a junk rig sail where the battens are sheeted the battens need to be very rigid. The Ruel Parker type battens could work in a conventional flat junk sail, allowing a bit of curvature in the fore part of the sail, but keeping the sail flat towards the leech providing a camber like shape to the sail. It would be interesting to see how this worked on a junk sail.
  • 17 Oct 2019 22:35
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    Reply # 8062301 on 7985090
    Anonymous member (Administrator)

    Bob,

    That doesn't appear to be a Junk rig. The luff is at the mast. Are the battens sheeted?

    Arne
  • 16 Oct 2019 14:49
    Quote
    Reply # 7986893 on 7985090
    Anonymous member

    Reuel Parker has been using PVC battens in his various designs (including junk rig) for decades with very good r results.  His basic approach is to fill the aft 60% of the batten with wood.


    I've been using the same idea but with an added piece of PVC pipe one size down replacing the wood insert. This seems to work finestkind.

    5 files
  • 16 Oct 2019 14:20
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    Reply # 7986834 on 7985090
    Deleted user

    Thank you all, for the discussion.
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