The "Sib-Lim" Challenge

  • 13 Nov 2014 05:09
    Reply # 3148775 on 3144241

    Hi,

    I have just posted a design in JRA members files/drawings/David Webbs boat designs/ Korora 1 and 2 a design that I have been working on for the last few months. It seems to meet many of Annie's requirements. The design is a work in progress at the moment but I will be without a drawing board for the next few months so I have posted the design for comment and feedback.

       The hull shape is pretty much finalized but the interior layout is still open to change as also is the rig. I have shown two options for power, inboard diesel or outboard in a well. The draft is two feet and the box keel will allow the boat to be beached and the bottom cleaned except for the base of the box keel. The center plate is a drop plate similar to those used on the New Zealand Scows and the small forward centerboard is for balance and to make the boat steadier at anchor. The small mizzen sail has a fixed boom on a rotating mast and can be used a balance for the mainsail, to help steady the boat at anchor and to power as self steering gear similar to that on Gypsy Moth 4.

        Any comments would be appreciated. Thanks, David.

        

    Last modified: 14 Nov 2014 05:48 | Anonymous member
  • 12 Nov 2014 20:53
    Reply # 3148497 on 3148054
    Roger Scott wrote:

    I don't know who would build it or where you would get plans, but I see you in a smaller version of the Golden Lotus. It had a spacious interior, big deck area and above all, 3 masts. Yes, simplicity is nice, but as a short-handed sailor of the fairer sex, strength could eventually play bigger role. I find the smaller main much easier to hoist . The little mizzen and foresail are no problem to handle. You're a full-blooded Junkie lass, go traditional!

    I'm afraid Golden Lotus doesn't do it for me. And I want to build this boat largely by myself - with some help from my friends!  My present sail is easy to haul up and I can always get a bigger winch :-).  After all, there are ladies a lot older than I sailing large bermudan-rigged boats about. 

    Three masts are cool, but a bit too much complication for me. 


  • 12 Nov 2014 20:48
    Reply # 3148495 on 3147880
    Gary Pick wrote:

    How about this one Annie?

    Harry Sailing Scow

    I still hope to be able to get to windward and would like to think I could go to the islands.  But it's great to see what's 'coming out of the woodwork'!
  • 12 Nov 2014 20:43
    Reply # 3148493 on 3147359
    Gary Pick wrote:

    Hi Annie just to widen the design base.

    Anyone up for a design challenge?

    Thanks, Gary.  Some interesting ideas, boats and the usual prejudices trotted out.  Tell 'em my Raven (5ft draught) sails as well with JR as she did with her fully-battened bermudian mainsail and roller furling headsail.  Of course the shoal draught is the challenge: that's why I haven't just picked a design off the shelf.  But David Tyler has shown that it's possible to design a boat with shoal draught, that is offshore capable and can go to windward - even with junk rig!!

    (PS You'd have to be a dyed-in-the-wool conservative to say that the Raven design is not offshore capable.  I'm not entirely sure about the quality of the build, however: that's another reason for building one's own.  You know which corners were cut!)

  • 12 Nov 2014 20:32
    Reply # 3148487 on 3146748
    Arne Kverneland wrote:

    I’ve been thinking along similar lines as David does above, and I find it very hard to design a boat that fits within Annie’s specs. Shallow draught and offshore weatherlyness is not that easy to combine.

    One spec. that I have added myself is that the boat must be easy to build and to fit the interior into. I therefore focus on a single chine (plywood) boat with flat bottom.

    Within the 24”/61cm draught limit, I think it is possible to fit a stub ballast keel, either one central one or twin stubs to stand upright on. It could be smarter to use one stub as this would give better access to one bottom side (at the time) for scrubbing.

    One specification I would most certainly break is the 26’/8m LOA limit. I would rather focus on the displacement of 3000kg. With some overhangs the LOA would be better at 8.5  -  9m. Spreading the 3 tons over a bit longer waterline (around 7m) can be done with straighter and less complicated hull lines. A 9m boat at 3 tons will be faster than an 8m boat with the same sail area or engine power, and it will be easier to build.

    Then there is the request for a quiet-at-anchor bow, quite important on a floating home. This could well be the showstopper for the sampan type I have in mind. Therefore, I’d better shut up. I should rather build a big (5.5  -  6m / 250  -  300kg) scow/sampan type daysailer for myself first, before suggesting the type to others.

    Arne.

    PS: Annie, just for the record, is the 3000kg displacement the dry or loaded weight?


    I'm so happy that my idea is taking wings, like this! And yes, I know I'm asking for the impossible, but as my father used to say: 'Them's as asks may not get, but them's as don't ask, don't want'!

    Easy to build: I'm all for that.

    Let's see what your slightly larger boat looks like, Arne.  3000 kg is the full displacement, but my own personal possessions don't weigh much at all: I have empty lockers on Fantail.  Boat's gear, of course: 10kg anchor, 25m 8mm chain - one of the reasons I don't want to go much bigger: I'll have to up grade to a 15kg anchor which becomes heavy for me to manhandle.  Spare anchor of same size or one size down: spare chain.  Outboard motor.  25l? fuel.  20 l cooking fuel.  100 l +/- water.
  • 12 Nov 2014 20:24
    Reply # 3148478 on 3146388
    Arne Kverneland wrote:

    Annie, the cockpit will only be as big as you build it  -  there is no law against playing a bit jazz on a design...

    Arne

    Arne, you are quite right of course.  The problem is, that I'm not sure if I'm clever enough to do so.  That's why I'm picking the brains of all you creative people: to give me the ideas I need to get where I want :-)

  • 12 Nov 2014 20:22
    Reply # 3148474 on 3146594
    David Tyler wrote:

    While I would love to draw for Annie a sweet little flat-bottomed traditional Chinese junk, I feel that it would be very difficult to clean the bottom when on the beach. In that respect, I've got on well with Tystie's hull form - a sort of curved 'V' below the chines, with a strong central keel that takes the pounding as she settles down in less than ideal conditions, after which she gently and obligingly rolls onto one side or the other so that I can scrub. When I was in northern waters, I relied on the Copperbot, but found it to be inadequate for tropical waters. Of course, my pivoted bilgeboards won't act as legs, but the daggerboard-style bilgeboards fitted to Malliemac can do just that, and they take up less room in the accommodation. Unlike a centreboard, they don't clog with mud. 

    Tystie has internal ballast, and a hull depth of about 2ft 9in, so a draught of 2ft should be achievable on a length of 26ft. However, I don't know whether sufficient stability can be obtained with internal ballast at this hull size, so it might be a good plan to incorporate some external ballast in the form of, say, a length of old railway track on the bottom of the keel, for its weight and strength.

    One of my thoughts is to have the keel in the form of a thick plate (or plates) of steel.  The boat will be beached onto fairly coarse sand and stay there a couple of tides.  Result: no more barnacles.  Copper and epoxy for the rest of the hull.

    I really like the idea of daggerboard-style bilgeboards.  Can they be made to be controlled from the cockpit, I wonder?

    Last modified: 12 Nov 2014 20:54 | Anonymous member
  • 12 Nov 2014 08:16
    Reply # 3148054 on 3144241

    I don't know who would build it or where you would get plans, but I see you in a smaller version of the Golden Lotus. It had a spacious interior, big deck area and above all, 3 masts. Yes, simplicity is nice, but as a short-handed sailor of the fairer sex, strength could eventually play bigger role. I find the smaller main much easier to hoist . The little mizzen and foresail are no problem to handle. You're a full-blooded Junkie lass, go traditional!

  • 11 Nov 2014 23:15
    Reply # 3147880 on 3144241

    How about this one Annie?

    Harry Sailing Scow


  • 11 Nov 2014 20:53
    Reply # 3147682 on 3144241

    Well done Annie!  A brilliant initiative.   

       " ...there is nothing - absolutely nothing - half so much worth doing as simply messing about in junk-rigged boats" 
                                                               - the Chinese Water Rat

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