CARAVELINA - New JR scow minicruiser

  • 14 Oct 2019 10:29
    Reply # 7959014 on 7917477

    I don’t think I can answer that numerically - so many variables. Just (in my opinion) schooner good enough, ketch better, single sail best.  

  • 12 Oct 2019 12:56
    Reply # 7956904 on 7917477

    Thanks David for your opinion. Yes, I have good few reasons on my list to keep two masts, so I definitely will give it a try. But I'm going to plan carefully the rigging and go down with the chord to some 2.4m, as you have suggested. What, in the terms of degrees, would be in your opinion the difference in performance between one and two mast rig? 

  • 11 Oct 2019 09:47
    Reply # 7928012 on 7917477

    I'm seeing a hull shape similar to some of the mini transat boats, and I'm wondering whether that is what you have in mind? I see that you've completed an Atlantic circuit already, so you know what's involved with this. Two sails are not so good to windward as one sail, but this hull is optimised for downwind sailing as well, so they may match. 28 sq m would be more than enough for me, I'd prefer 26 sq m and a 2.4m chord, so that there's room for the sheets. With two sails, I found that the foresail was better with a single sheet, but the after sail needed port and starboard sheets to trim it close enough. Still, unless there's a very good reason for having two sails, I'd go for one sail on this boat, with upper and lower sheets, for better performance, better reefing and easier handling. If I scale up my Weaverbird sail to 26 sq m, the batten length is 4m. If I add another panel to the original 22 sq m sail, the area is also 26 sq m but the batten length stays at 3.375m. If the hull can stand up to a high AR like this, it would give the best upwind performance, and the downwind performance would be no worse than with the two sails.

  • 11 Oct 2019 07:22
    Reply # 7927865 on 7917477

    Thank you very much for your comments and advise. Sail plan as shown is in a very initial state. Certainly it requires some play  with Chord - now 2750mm, and the mast height. Definitely, I prefer single sheets on both sails.

    With displacement between 1.2 - 1.6 tons fully loaded for a long range cruise I'd love to have enough sail area to take advantage of hull shape and go planning in the trades. Will a 28 - 30 square meters be enough? 

  • 11 Oct 2019 00:33
    Reply # 7927478 on 7917477
    Anonymous wrote:

    After some 10 years of sailing my 24' Colvic Springtide I decided to build new quite different boat. With the help of professional naval architect I have basics ready. Now I need guidance from JRA regarding the sail plan details. After reading and seeing most of what available on the JRA website, I chose she (my new Dream Boat) will be a two mast schooner with similar sails on both masts. Alike Alouette or Badger. Rather flat with hinged battens. Please see the haul data and my idea regarding rig.


    A very interesting shallow draft boat.  Two masts with sails of similar size are also interesting, though it introduces some complexity for such a small boat.  For one thing, with the rig as drawn you will need to use double sheets for each sail, that is a sheet on either side of the sail, which is a lot more fiddly than single sheets.  I think two masts make a lot of sense for offshore cruising but for inshore work, or coastal cruising on a small boat, I prefer a single sail with one sheet.  It is so simple.  You only have one sheet and one halyard, so easy to adjust.  There will also probably be a yard hauling parrel and a luff hauling parrel but these lines are just for minor adjustments.
  • 10 Oct 2019 13:47
    Reply # 7926500 on 7917477

    Hi Kris,

    Great project! Are you planning on double sheets for the foresail? If not, you might want to consider that – otherwise, it looks like other adjustments will be needed to have enough space for the sheet for that sail.

    Wishing you loads of fun with the whole thing!

    Shemaya

  • 04 Oct 2019 10:55
    Message # 7917477

    After some 10 years of sailing my 24' Colvic Springtide I decided to build new quite different boat. With the help of professional naval architect I have basics ready. Now I need guidance from JRA regarding the sail plan details. After reading and seeing most of what available on the JRA website, I chose she (my new Dream Boat) will be a two mast schooner with similar sails on both masts. Alike Alouette or Badger. Rather flat with hinged battens. Please see the haul data and my idea regarding rig.

    Last modified: 06 Oct 2019 12:37 | Anonymous member
    Moved from Flat Bottomed Junks: 06 Oct 2019 19:59
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