The design of soft wing sails for cruising

Discussion in 'Boat Design' started by David Tyler, Jan 19, 2014.

  1. David Tyler
    Joined: Jan 2014
    Posts: 154
    Likes: 3, Points: 0, Legacy Rep: 22
    Location: Victoria BC at the moment, but no fixed location.

    David Tyler J. R. A. Committee Member

    Mark,
    Short answer to all your questions: No.
    No book; I'm too busy making things and sailing.
    Single sided after part to the sail is easier to assemble.
    Adjustable cambering lines don't work; they're too stretchy.
    There isn't going to be a mizzen, just one larger single sail.

    The construction of the carbon spars is nearing completion, and sailmaking will commence soon.
     
  2. Cat2Fold
    Joined: May 2012
    Posts: 56
    Likes: 1, Points: 0, Legacy Rep: 13
    Location: Felt, Idaho

    Cat2Fold Junior Member

    Hi David,
    Still trying to decide if I'm going to take on such a project...
    Question...
    What is the reason to use the Mustang cloth or the other one?
    Why not use sailcloth? Is it cost based? Of is there another reason?
     
  3. David Tyler
    Joined: Jan 2014
    Posts: 154
    Likes: 3, Points: 0, Legacy Rep: 22
    Location: Victoria BC at the moment, but no fixed location.

    David Tyler J. R. A. Committee Member

    Soft cruising Dacron sailcloth can be used. I used Richard Hayward's Sunwing http://www.heathcoat.co.uk/marine for my last wingsails. It's UV protected, and better value than others that are not so protected.

    Mustang (also Odyssey III) is preferred for junk rig and derivatives because it is soft, and reefs and furls better than Dacron sailcloth; it is a cover material, and so needs no extra covering to protect it when not in use; and is usually less expensive than Dacron sailcloth.
     
  4. Cat2Fold
    Joined: May 2012
    Posts: 56
    Likes: 1, Points: 0, Legacy Rep: 13
    Location: Felt, Idaho

    Cat2Fold Junior Member

    Is it stretchy?
    Why is it not typically seen used on Marconi style sails?
     
  5. David Tyler
    Joined: Jan 2014
    Posts: 154
    Likes: 3, Points: 0, Legacy Rep: 22
    Location: Victoria BC at the moment, but no fixed location.

    David Tyler J. R. A. Committee Member

  6. David Tyler
    Joined: Jan 2014
    Posts: 154
    Likes: 3, Points: 0, Legacy Rep: 22
    Location: Victoria BC at the moment, but no fixed location.

    David Tyler J. R. A. Committee Member

    It's stretchier on the bias, but reasonably stable along the threadline. Bermudan/Marconi sails need minimum stretch in all directions, so they need a tightly woven cloth with a resin filled weave. Junk sails and derivatives do not need this. The battens distribute the loads across the cloth, and the battens are sheeted to further distribute the loads. Junk sails have been made from Polytarp, Tyvek, nylon bag-making cloth etc, on a very minimal budget. Of course, some of those don't last long in UV exposure.
     
  7. David Tyler
    Joined: Jan 2014
    Posts: 154
    Likes: 3, Points: 0, Legacy Rep: 22
    Location: Victoria BC at the moment, but no fixed location.

    David Tyler J. R. A. Committee Member

    Just to show that I haven't been idle, here's a photo of the carbon fibre battens, hinges and noses, and a photo of the yard under construction.
     

    Attached Files:

  8. Cat2Fold
    Joined: May 2012
    Posts: 56
    Likes: 1, Points: 0, Legacy Rep: 13
    Location: Felt, Idaho

    Cat2Fold Junior Member

    Keep up the GREAT work David!
    This was sent solely to cheer you on.
    Can't wait to see your finished product!
     
  9. Pollen
    Joined: Feb 2014
    Posts: 2
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: BRUSSELS

    Pollen New Member

    That's a nice job, David ! I'm sure this will be a good rig !
    I hope to see the result on Tystie ... quickly... ;)
     
  10. Mark Thomasson
    Joined: Apr 2014
    Posts: 5
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Scotland

    Mark Thomasson Mark Thomasson

    Dear David,
    Thanks for your reply, as short as is deserved.
    You can tell I am a coastal sailor (so far), and do not straight away test my thoughts against - 'what will happen when things go wrong, in a rising gale and lee-shore, at night'
    Is your single wing-sail going to be going to be smaller than the previous junk sail? (which always looked twice the size I would like to handle)
    When you have time, it would be interesting to know your techniques used in moulding the battens.
    Look forward to seeing progress, the finished article, and of course hearing how she performs.
    cheers Mark
     
  11. redreuben
    Joined: Jan 2009
    Posts: 1,604
    Likes: 53, Points: 48, Legacy Rep: 349
    Location: Beaconsfield Western Australia

    redreuben redreuben

  12. Mark Thomasson
    Joined: Apr 2014
    Posts: 5
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Scotland

    Mark Thomasson Mark Thomasson

    Sneek preview

    David is up and sailing -see the JRA web-site.

    Well done.
     
  13. bjn
    Joined: Jul 2014
    Posts: 123
    Likes: 5, Points: 18, Legacy Rep: 16
    Location: Stockholm

    bjn Senior Member

    That can't be possible in practice.

    I assume you are running with an infinite aspect ratio.

    Try an aspect ratio closer to what would be achievable on a sail and see what happens.
     
  14. rwatson
    Joined: Aug 2007
    Posts: 5,676
    Likes: 239, Points: 63, Legacy Rep: 1749
    Location: Tasmania,Australia

    rwatson Senior Member


  15. David Tyler
    Joined: Jan 2014
    Posts: 154
    Likes: 3, Points: 0, Legacy Rep: 22
    Location: Victoria BC at the moment, but no fixed location.

    David Tyler J. R. A. Committee Member

    Some early photos:
     

    Attached Files:

Loading...
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.