Conch 32 and an unusual junk hybrid rig

  • 03 Jun 2014 00:42
    Reply # 2998654 on 1557297

    Yes the mast rotates.  Having the rotating arm at the masthead, however, means that the mast will only rotate as much as the sail does.  That significantly limits the performance advantage of the rotating mast.  Standard practice, when sailing to windward, is to rotate the mast more than the sail, which creates a smooth entry to the leeward edge of the foil, eliminating turbulence at the luff.  This adds notable speed to a high-performance racing boat, though I wouldn't choose it for cruising.  I'd choose a hull/rig configuration like Marie G, perhaps with a lifting keel, depending on location.

  • 02 Jun 2014 13:46
    Reply # 2998296 on 1557297

    I assume the mast rotates, so controlling the camber top and bottom. 

  • 01 Jun 2014 15:56
    Reply # 2997552 on 1557297

    There is something I don't understand about that rig: the normal practice with wing masts is to over rotate them, to get a smooth lee side.  However, that gallows at the top is fixed to the mast and seems to prevent over rotation.  At that point, you lose much of the benefit of rotation.

    Aerodynamically, this would make more sense to me with a sail that wraps around the mast.

  • 27 May 2014 18:44
    Reply # 1557711 on 1557297
    Anonymous member (Administrator)

    I too am a big fan of Ruel B Parker, and have spent quite some time over his "The Sharpie book#, and that about Advanced Sharpies. I like the long and lean concept of the sharpies, but I am looking forward to see what he comes up with from the garvey tradition (very similar to Chinese sampans).


  • 27 May 2014 16:00
    Reply # 1557652 on 1557297
    Deleted user
    I used the Parker hybrid battens on my JR sails and they, so far, seem to have worked excellently.

    I was sailing my boat like a large dinghy in variable winds from 5-15 kts the other day, and of course offshore I found the performance perfectly suitable. 

    I think this is an interesting hybrid partly because the mast construction is doable by an average homebuilder (e.g. nothing super special is needed). This sort of experimentation and innovation is precisely what we need to study and improve the JR as well as bring a subset of it's important tenants to other rigs and see how they interact.

    Parker is definitely smart and his past boats are well worth studying as immense successes - the reason this boat hasn't been adopted at the moment has far more to do, I think, with the economics of the region and with the state of racing sailing in general than anything else.

    I'd love to see a scow-bowed Mini Transat with a JR, personally!
  • 27 May 2014 00:24
    Reply # 1557426 on 1557297
    Reuel Parker is a talented individual who circumnavigated the world under sail before becoming a successful yacht designer with many charming boats built to his designs.  The Conch 32 hull and deck would provide an excellent platform for a good inshore racer but I suspect there would be a lot of development needed on the rig.  Still, it is an interesting idea for anyone who wants blistering performance and I wish someone would build it.  I'd be tempted to put a conventional unstayed mast and cambered HM sail on it, though it would not be quite as competitive (assuming you could get Reuel's rig to work).  It would be a wonderful boat for sailing on the East Coast of Australia between Brisbane and Thursday Island, where the retractable foils would allow assess to many sheltered anchorages. (Just carry plenty of sandfly cream!)
  • 26 May 2014 18:23
    Reply # 1557357 on 1557297
    Anonymous member (Administrator)

    I followed the link and found the sail to look very promising (but lacking in detail about battens and camber), so spontaneously I registered and wrote a comment on that site.

    The fact that Parker hasn't sold a single sail plan could mean that it is not good, but it is not a proof that it is bad. I guess it took 15 years before the numbers of copies of the cambered panel JR from Stavanger reach ten.

    BTW, Ketil Greve In Marie G won a single-handed race in Bergen this week-end. I am looking forward to reading his story here, when he returns.


    PS: OK, I see now that Parker has some sort of hybrid battens , being bendy in the fore end and straight in the aft end. Maybe that could work, Only practical testing would show what is best...

    Last modified: 26 May 2014 18:33 | Anonymous member (Administrator)
  • 26 May 2014 16:50
    Reply # 1557317 on 1557297
    I'd say this was a "Junkette" rig, in essence - a cross between gaff and junk. The added features are the rotating mast with its tiller at the top. That looks good on paper. Interesting, Daniel, but the telling point for me is when Reuel Parker says "I have never sold a set of plans for the Conch 32, and one has never been built"

  • 26 May 2014 15:12
    Message # 1557297
    Deleted user—part-i

    Parker does an interesting thing borrowing from the junk sails and the performance crowd... have we discussed this rig yet here?

    Just thought I'd throw it out there if not.
       " ...there is nothing - absolutely nothing - half so much worth doing as simply messing about in junk-rigged boats" 
                                                               - the Chinese Water Rat

                                                              Site contents © the Junk Rig Association and/or individual authors

Powered by Wild Apricot Membership Software