Downwind sailing, balance, first reef.

  • 19 May 2020 19:53
    Reply # 8979904 on 8974594

    Hej Arne. That’s the idea. I will consider putting som grommets in for sure when we get there.. thanks. 

  • 19 May 2020 16:18
    Reply # 8979377 on 8974594
    Anonymous member (Administrator)

    Frederik,

    It appears that that I have worked with your first question almost a year ago.
    On the first diagram I have drawn in a new top section to let me set the sail with more general balance (25%). I quick glance at that diagram confirms that your idea of just rolling up the top panel, makes sense.

    The second diagram shows the sail swung forward for downwind sailing. Thanks to the 10° rise of the boom, on avoids that it will drop too low at the clew.

    Arne



  • 17 May 2020 20:47
    Reply # 8975427 on 8974594

    David. Yes i understand the way to increase balance on the sail you had on Footprints.

    On a "Arne" type sail though, that might not be quite so effevtive.


    Arne. some sort of Vikingjunk  Square rigger. Full circle..

    Big rudder & Centerboard: Check.

    Last modified: 17 May 2020 21:00 | Anonymous member
  • 17 May 2020 20:31
    Reply # 8975407 on 8974594

    Quite possibly the easiest way to achieve 'balance' when sailing off the wind is to allow the boom to swing forward across the mast which provides a lot more balance sail area on the other side of the mast. On 'Footprints' with her large 53 sq m sail this allowed us to carry a large amount of sail even in strong wind conditions and removed any weather helm making the boat very easy to handle. We could get almost half the length of the boom across the mast. But to do this requires long batten parrels which begin at the forward end of the battens, and attach again at the batten mid point. It also requires two control lines for the boom, one to pull the boom aft, and the other to pull it forward. This second line is almost not needed because the boom will swing forward itself, but the second line helps to hold the boom in position. This may all sound a little complicated but it is actually very easy to set up and easy to use.

  • 17 May 2020 19:44
    Reply # 8975252 on 8974594
    Anonymous member (Administrator)

    I see your point, Frederik. Still, I would rather choose the Chinese way of doing it. They always had a big rudder, and they could also raise the cb. for downwind work. I haven't seen a single Chinese rig which appeared to be shifting the sail back and forth.

    One alternative is to make a fully symmetric squaresail with JR technology. If it turns out to be possible for one person (plus a wind-vane) to operate it, it would be a really interesting sail for offshore work. Some development work would surely be needed before one learns to control a squaresail.
    Goodbuye to gybing...


    Arne

  • 17 May 2020 19:11
    Reply # 8975207 on 8974594

    Jami. Yes that would be the idea.


    Arne. I was not so much thinking of Orion; she´s handling fine, but more as a general idea and a possibillity for the main sail of the junk yawl that´s in the making..

    Maybe different spaces in the batten pockets to attach the parrels to, for longer longer parrels for extended downwind sailing..

    Last modified: 17 May 2020 19:15 | Anonymous member
  • 17 May 2020 18:26
    Reply # 8975059 on 8974594
    Anonymous member (Administrator)

    Frederik, I bet that should be doable. However, even with my unbalanced sail on Ingeborg, I can carry at least as much sail downwind as upwind (or rather a bit more) before thinking of reefing, so there is not much to win, speed-wise.  

    Only if I were to race for silverware, would I bother with installing the at least three more control lines needed to let me wring out those extra 3-5% speed downwind. For my cruising, I prefer the half-short batten parrels, which make reefing easier.

    Arne

    PS; I must add that Ingeborg has a good rudder, so is not the first to need a sail with adjustable balance...


    Last modified: 17 May 2020 18:55 | Anonymous member (Administrator)
  • 17 May 2020 15:07
    Reply # 8974765 on 8974594

    This is what I did with my previous sail, although not for downwind sailing but to generally get more balance.

    In fact, a temporary tryout can be seen in this video.

  • 17 May 2020 13:24
    Message # 8974594

    Hi all

    Here is a tought that has been in my head for some time now. Probably nothing new, but I haven´t seen it mentioned anywhere.

    When sailing downwind for extended periods, say in the trade winds, and wanting to have more balance in the sail, then why not reef the top panel to the top batten, tie the yard to the batten with reef lines and have a "new" lower angle in the reefed top section that will match a greater amount of balance.

     This will  naturally give a reduced amount of sail area -which does not seem to matter that much sailing downwind- but when needed, one could rig a spare panel or a "watersail" like an old genua from the boom...

    Frederik




    Last modified: 17 May 2020 13:25 | Anonymous member
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