Is the junk-rig faster in the tacks, single-handed?

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  • 04 Feb 2016 22:56
    Reply # 3801426 on 3417084
    Anonymous member (Administrator)

    Robert,

    if the rudder is as shown on your sailplan, I think you would benefit from  making an endplate at both ends of the rudder.

    Arne 



    ...just borrowed your plans for others to see what I am talking about...

  • 04 Feb 2016 22:40
    Reply # 3801399 on 3417084

    Hi Arne,

    Your idea of a plate on the bottom of the rudder could be a good one - easy to do and fit. A previous boat of mine had one and I believe that it increases the effective area of the rudder by a considerable factor.

    Blondie has cambered sails. Camber is 8% for panels 4-7, 6% for panel 3, 4% for panel 2 2 and 2% for panel 1. These percentages were the designed and built into the sail. I should have a go at measuring the actual camber sometime soon. Now that Blondie is sailing well it would be good to have some photos for you to view - hard to take on your own boat without a long selfie stick!

    Rob


  • 03 Feb 2016 07:58
    Reply # 3797448 on 3417084
    Anonymous member (Administrator)

    Robert,
    I had a look at Blondie in your photo album. Great boat. If you feel you could use a bit more steering control, I suggest you simply fit an endplate at both ends of the rudder, similar to this, shown at the bottom end of a Freedom 28 or 30 rudder. I would make their wingspans about 2/3 or ¾ of the chord of the rudder.

    Cheers, Arne

    PS: May I ask if you use camber in your sail, and if 'yes', how much?

     

    Last modified: 03 Feb 2016 08:03 | Anonymous member (Administrator)
  • 03 Feb 2016 04:31
    Reply # 3797237 on 3417084

    Very interesting comments, Arne, David and Gary.

    When I sailed Blondie with the Bermudian rig I had no problem at all going about. She had plenty of speed and went through the wind easily. Backing the genoa or jib was helpful but rarely needed.

    After conversion to junk rig I was very pleased with how Blondie sails and how easily she is to handle but I have had problems going about. Last week I had a bit of tacking practice and found going from the port tack to the starboard tack was fine but not the other way around. Maybe the mast position to the windward of the sail slows the boat through the port to starboard tack. Today, following Arne's suggestion I eased the boat off the wind before each tack and tacked perfectly 100% of the time. I'm delighted. However, there was less chop today so only time will tell if we have a winning strategy.

  • 31 Jan 2016 11:33
    Reply # 3791831 on 3417084
    Anonymous member (Administrator)

    Tacking, making it or not...

    When I converted my 7.1m Albin Viggen, Malena to JR (flat sail) after nine years with a Bermuda rig, I was surprised to find she had become reluctant to tack, something new to me in that boat. After I had a spectacular grounding of her, following a missed tacking, I developed a combination of habits when tacking:

    1.      Keep generous distance to lee shores if you can.

    2.      Fall off a bit to pick up speed before rounding up.

    3.      Round up by gradually, giving more and more rudder, to lose as little speed as possible.

    4.      If she stops at the top, grab the boom and back the sail gently. That was very effective with the flat sail (less so with cambered sails)

    The tacking of the flat sail always ended with the boat falling off almost 60° before picking up speed.

    When Malena was given a cambered sail, either with hinged battens or cambered panels, she became herself again and tacked smartly and settled at the intended course on the new tack.

    It seems to me that with a cambered JR, the ability to tack is the same as with Bm rig, and simply depends on the hull: A boat with a blunt bow, light displacement and a small rudder is thus likely to fail when tacking against an awkward chop.

    A possible advantage with the Bermuda or gaff rig is the ability to back the jib to get you over the top. On the other hand, that jib or genoa may also throw you over onto a new tack if the wind suddenly shifts. In confined waters that may cause more excitement than strictly needed.

    Conclusion: I recommend fitting big, efficient rudders(s) on sailboats in general, and on junks and catboats in particular.

    Cheers, Arne

     

    Last modified: 03 Feb 2016 07:25 | Anonymous member (Administrator)
  • 31 Jan 2016 00:29
    Reply # 3791555 on 3417084

    Yep, she will tack okay with a bit of speed behind her.

  • 30 Jan 2016 20:18
    Reply # 3791361 on 3417084
    Deleted user
    Re Gary's comment about Redwing not tacking. Footprints often would not tack with her old flat sail. Even when the new camber panel sail was fitted I sometimes had problems but that I discovered was because the CE of the sail was too far aft. Once I corrected that I have had no further problems. So before going to the trouble of deepening the rudder look for more simple solutions first. It also sometimes pays to come off the wind a bit to allow the boat to build up some speed before tacking, then push the tiller hard over and keep if fully over until the boat has swung through the wind.
  • 30 Jan 2016 05:36
    Reply # 3790341 on 3788529
    Gary King wrote:
    Gary Pick wrote:

    I found on my last sail which started to windward into a choppy sea that Redwing just did not want to tack. Possible reasons are that I was pinching the wind a bit to tight and therefore not get enough speed up to carry me through to the other tack. The other possibility is  she was sheeted in too hard. I have found in the past that she will not answer the helm with the sail sheeted in too far. Of course it may have been a combo of both.

    I am still thinking of fitting a deeper rudder next haulout.

    It's the chop, always a tack wrecker. Notice you never miss a tack on flat water?

    It certainly slowed me down.
  • 30 Jan 2016 05:35
    Reply # 3790340 on 3789029
    Richard Brooksby wrote:

    Instant tacking with no hands (sort of) on my Coromandel

    https://www.youtube.com/watch?v=ScnZxiHsnKg

    I have seen that before. I must try it one day...I may have to wait till my safety lines are back on though. You sort of need somewhere to hook it on to.
  • 30 Jan 2016 03:30
    Reply # 3790194 on 3417084
    Deleted user

    https://www.youtube.com/watch?v=DhQjs3EDARM

    10s tacks in Rodger Taylor's video of sea trials in Mingming 2. Speed of tacks is correlated with D/L ratio of the boat. Mingming 2's D/L is 160...very light displacement. A heavy displacement boat with D/L's in the 350+ range would be slower to come about, every thing else being equal.

    rself

    Last modified: 30 Jan 2016 03:35 | Deleted user
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