SibLim update

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  • 20 Jan 2021 09:18
    Reply # 9884007 on 9876576
    Anonymous wrote:
    Anonymous wrote:

    Apologies for the delayed photographs. Fan Shi is truly a work of art and skims along very nicely in those light conditions. What a festival of sails and colour on the Saturday. Congratulations to both Annie and David, Fan Shi looks like she was never not in the water; a little home, very much at home on the sea! 

    Excellent photographs Roger!

    Looks like a bit of a 'Junk Armada' invading the Whangarei River.

    Thank you Zane, indeed it was; something of a Fan Fare to say the least!
  • 20 Jan 2021 09:09
    Reply # 9884002 on 4315719

    Thank you David, I am glad you like them. I think the event took everyone's breath way, such a colourful and beautiful little boat. In the words of Brian Clifford, she sits in the water like a duck. Congratulations on the design!

  • 20 Jan 2021 09:02
    Reply # 9883984 on 4315719

    Hahaha, very nicely put, thank you Graeme. What an unforgettable event and hopefully many more to come! See you next time!

  • 20 Jan 2021 03:25
    Reply # 9883241 on 4315719

    Roger, your set of beautiful photographs shows the joy, the colour, and all the interesting innovations and details of FanShi – the Chinese-style bow, open between the bulwarks, Annie’s “delilah posts”, the heavily-cambered teak-laid flush deck, the little cockpit hoop delicately supporting the mainsheet, the rotating pram hood and see-all-round dome, the wind vane set in clear air above the light-and-simple low-slung davits which make a platform for the little solar panels, the rudder trim tabs, the asymmetric canted bilge boards, the delicate five-planked FanTan tucked in behind the lute stern in burglar-repellent colours... there is so much going on… what a symphony, what a boat!

    You must put these photos in (and on) the magazine and document the launching.

    Here's my favourite

    David: I'm not in Whangarei but can post (lend) a go-pro if Annie wants it.

    Last modified: 20 Jan 2021 03:33 | Anonymous member
  • 19 Jan 2021 23:24
    Reply # 9882004 on 4315719

    hi annie

    i know, the crew is not the biggest part of the displacement of fanshi, but if you sit in the lee (and as far forward as possible) the lee helm will be a little bit reduced as heeling and weight forward builds up weather helm.

    …and yes – i'm really impressed by your successful build and launch…

    ueli


  • 19 Jan 2021 22:59
    Reply # 9881679 on 4315719


    What an astonishingly beautiful boat.

    I think it’s just knocked Jonque de Plaisance and China Cloud down to 2nd and 3rd places. 

    Awed congratulations to Designer and Builder.


    Annie it has been such a joy following your build from start to finish. 

    I do hope you’re not at all disheartened at the Sail balance teething trouble. 

    After a rest you’ll have her sorted in no time and sailing like a Witch.

    Ready to voyage on the Sundering Seas..

  • 19 Jan 2021 22:45
    Reply # 9881181 on 4315719

    A thought: could anyone who's on the spot in Whangerei manage to strap a GoPro or similar wide angle camera on top of the davits, so as to capture the helm angle, the position of the boards, the sheeting angle, the heel angle etc, all at the same time, and put the result on youtube? That would help analyse the situation remotely. 

  • 19 Jan 2021 21:41
    Reply # 9879497 on 4315719

    Anyone who has put a newly-built, one-off boat into commission will know that feeling - 12 hour days, a great many things to learn and think about and evaluate after launching, starting from zero. What I'd do is take a week off and sit in the sun, then come back to the sailing trials.   

    Being a bilgeboarder has to be taken into account when thinking about helm balance - the boat doesn’t like to be sailed too tight to the wind with the boards stalled. Better to point off the wind enough to keep the speed up and the water flowing over them. Otherwise they don't lift, and there's lee helm.

    pinchingEffect

    The ‘driving’ boat will end up to windward although the ‘pinched’ boat seems to be pointing higher.  

    If the YHP is doing nothing much ( which was as planned, to reduce the stresses on the sail and skipper), maybe you can afford to move the halyard forward on the yard a little, and rig a THP as Arne says, as well as pulling the tack back?

    Arne, yes, the battens are hinged, but the shape of the camber in the middle of the panels won't be very different from that in one of your sails.

    Last modified: 19 Jan 2021 21:46 | Anonymous member
  • 19 Jan 2021 21:25
    Reply # 9879287 on 4315719
    Anonymous member (Administrator)

    Annie, maybe some of my experience with my Johanna can be used on Fanshi:
    First time I hoisted sail on Johanna (2003), I noticed a considerable lee helm when sailing close-hauled in light winds. It was not a control problem, but being used to boats with a little weather helm, I thought this was annoying. The first reaction was the natural one; to shorten the tack parrel and to haul the top as far aft as I could with the LHP, (..later modified to a THP which only acted on the yard and batten 2, I think it was...). Problem was, I had cut the mast a little too short, so there was little drift for the halyard to let one shift the yard enough aft. The fully hoisted sail was therefore canted a bit forward, as on the ‘original’ HM-style sails. However, this remedy reduced the lee helm enough to make it tolerable.

    As soon as a reef had been taken, there was room enough to shift the top 30-50cm further aft, and this was enough to achieve the wanted, light weather helm. See photo of Johanna, below, with one reef. Note how the halyard’s slingpoint has moved well aft. A THP on Fanshi, acting only on the yard and batten #1, will let you tug the yard as far aft as the halyard drift allows. With the first reef taken, your sail can be hauled much further aft, just as on Johanna. Hopefully that lets you do away with most of the lee helm.

    Questions:

    • ·         Does the helm balance change with the boards up versus down?
    • ·         Do my eyes spot hinged battens there?

    Cheers,
    Arne


    P
    hoto: Peter Manning, 2008

    PS: No, I am not aware of that you don't have a technical mind. I only am aware of that you say so...

    Last modified: 19 Jan 2021 22:43 | Anonymous member (Administrator)
  • 19 Jan 2021 20:23
    Reply # 9878946 on 9870767
    Arne wrote:It looks to me as if ‘Fanshi’s sail only has camber in the front section, and then combined with a hinge in the battens, right? The combination of these two features could possibly move the CP quite far forward.

    I wonder; is the same lee helm experienced on the port tack?

    Obviously, the simplest remedy is to shift the sail further aft on the mast, and see what happens. If there had been a Fanshi 2 only two months away from launching, I would have suggested that the sail was build with all-cambered panels and with the max-camber point at the middle of the sail. A little late now for that...

    Cheers,
    Arne

    Thank you for that, Arne.  As you know, I don't have a technical mind and trying to assess the sail intellectually is probably beyond me.  It was very difficult to get a real handle on what was going on in the very changeable conditions, but there was undoubtedly lee helm and it was sufficiently pronounced that at present I would not attempt sailng off the mooring in anything of a breeze.  I think it was worse on starbboard tack.

    As you say, the obvious first attempt is to haul the sail further aft.  I might add some standing luff parrels to help with that.  The way I had set up the running luff parrel, although it fitted with PJR's advice, made it bind quite badly and I'm not entirely sure I had hauled it in far enough.  The YHP does nothing until there are about 4 reefs in the sail, so the yard is obviously well forward, too.

    Suggestions such as altering the rake or adding a mizzen are essentially impossible, but if the worse comes to the worst, it is entirely feasible to take the sail off, add 300 mm to the leech and extend the forward part of the battens with some sort of mandrel and a wrap of glass and epoxy.  I should much rather spend my summer sailing than fooling around with all that palaver, so am keeping my fingers crossed that moving the sail aft will do the trick.  The wind has blown relentlessly since Sunday morning and I haven't had a chance even to raise the sail again.  To be honest, reaction and a month of 12-hour days have left me exhausted and I'm surprised I've even managed to think it through as much as I have!

    I still have an incredibly feeble Internet signal, so can't send and receive much in the way of images.


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