Designs for small junk-rigged cruising yachts

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  • 16 Jan 2014 10:16
    Reply # 1476096 on 1470232
    Following on from discussions about the boat used in Riddle of the Sands, I have been thinking about lifeboat conversions.  As a boy growing up in Durban, South Africa, I was always looking at lifeboat hulls with the view to procuring one for peanuts and converting it into a world-cruising yacht.  One thing I  noticed was that there was some variation in design.  Most hulls had a standard, well-rounded bow and finer stern with a distinctive, almost swan-necked sheer, but a few were more like yacht hulls.  I met a Swiss sailor, Michel Mermod, who converted one into a bermudian cutter and completed a seven year circumnavigation.  There was also a guy called Jerry Walker from Durban who, long after I left, converted one into a very interesting junk-rigged yacht called Jung Jung.  He sailed it up the Atlantic to England, eventually losing it in Portugal for want of a motor.  He was delighted with its performance, another vindication of the suitability of shallow-draft bouyant hulls for ocean cruising.
  • 15 Jan 2014 13:28
    Reply # 1475388 on 1470232
    Deleted user
    Nice, David.

    In my head, the sheet was more complicated than that, but I must mistaken because it was some time ago. I will check it as soon as I get the CE Norms.

    Antoine
  • 14 Jan 2014 01:42
    Reply # 1474306 on 1472430
    Arne Kverneland wrote:David,

    is there a formula for this STIX number which will let an ordinary human calculate the number for his or her boat, or does one need a computer program to work it out?

    Arne
    Arne,
    I found a spreadsheet version of the calculation:
    I found it in this thread, which is well worth reading by anyone who has an interest in boat design:

    In it, you will read that the STIX is a useful, but not foolproof tool for analysing boat design.

    (In fact the whole site is very authoritative, and worth reading through).

    [Webmaster note: I've copied those links into Junk Information > Useful links > Design and Navigation Software - Open Source, Freeware, and Shareware]
    Last modified: 17 Jan 2014 00:02 | Deleted user
  • 13 Jan 2014 15:53
    Reply # 1473813 on 1473360
    Graham Cox wrote:The Vagabond 26 certainly packs a lot into a short waterline and looks like an excellent design.  It has good form stability, a high ballast ratio and plenty of buoyancy  It has a very interesting construction technique that almost anybody could build.  I'd be particularly interested to know how the keel box is tied into the hull structure.  It is a bit modern looking for my tastes (I am a romantic) but that is just aesthetics and doesn't detract from the quality of the design.

    Here's a guy who built (or is still building?) one with a modified, slightly more "traditional" coachroof: http://forums.bateau2.com/viewtopic.php?f=3&t=13706&start=30#p182833
  • 13 Jan 2014 07:42
    Reply # 1473606 on 1470232
    Deleted user
    Hi

    Regarding Vagabond 26, I just want to point out that it is likely a copy of a french designer drawing. See here (French, sorry). As well as the vagabond 20 is a pure copy of Primo, by the same french naval architect, Jean Pierre Villenave, who have work for years to draw plywood boat for DIY boat builders. Villenave is a well known guy in France boat builders community, as he have written a nice book on traditionnal plywood boatbuilding.

    Just for information.

    Antoine
  • 13 Jan 2014 02:25
    Reply # 1473515 on 1470232
    Deleted user
    Been admiring that Vagabond for years, the website was up before we started building our Badger. Too bad there's no bigger version on that site.
    But for a really simple to build design, and difficult to be simpler than a dory, is the Benford 26' Raised deck cutter.  Almost 10' beam, 8,000lb displacement, so it is a 'big' 26 footer boat. Has a fin keel too which is good for pointing.
  • 12 Jan 2014 22:08
    Reply # 1473360 on 1470232
    The Vagabond 26 certainly packs a lot into a short waterline and looks like an excellent design.  It has good form stability, a high ballast ratio and plenty of buoyancy  It has a very interesting construction technique that almost anybody could build.  I'd be particularly interested to know how the keel box is tied into the hull structure.  It is a bit modern looking for my tastes (I am a romantic) but that is just aesthetics and doesn't detract from the quality of the design.
  • 12 Jan 2014 20:34
    Reply # 1473311 on 1470232
    Anonymous member (Administrator)

    Yes, that Vagabond 26 looks good, Bertrand. Nice, long waterline for the total length. With her fairly wide beam in mind, would it be an idea to give her twin rudders? That would let one install an ob. engine at the centreline. I checked its CR number and got 2.02 which is not that bad.

    Arne

    Last modified: 12 Jan 2014 20:35 | Anonymous member (Administrator)
  • 12 Jan 2014 16:59
    Reply # 1473191 on 1470232
    Hello

    Sure present time we are enjoying our large catamaran, she is very comfortable at sea and at anchorage but she can't go in narrow places or anchorages or narrow canals.
    Perhaps one day it will be more appropriate in my old days to get a such little sail boat very easy to build and easy to convert with a junk rig : The Vagabond 26
    It's an offshore capable cruising boat with shallow draft. The program of this boat is offshore cruising with comfortable accommodations for 2 during long cruises, maximum 5 during shorter cruises.

    Bertrand
  • 11 Jan 2014 15:13
    Reply # 1472735 on 1470232
    Anonymous member (Administrator)

    Stavanger, Sat.

    Capsize Ratio Number

     

     

    Thanks Antoine. Now I found another, quite simple, formula to express resistance against capsizing. According to what I found on the web, it was developed by the Cruising Club of America. It looks very simple, but it still makes sense to me if some common-sense is added. Since writing formulas are not easy here, I have produced a little write-up, called “Avoiding capsizing an offshore cruiser”. It can be found under “my” JRA page, here, under How-to-notes.

     

     

    Cheers, Arne

    Last modified: 11 Jan 2014 15:22 | Anonymous member (Administrator)
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