Junk Version of the DynaRig (s/v Maltese Falcon)

  • 04 Jun 2017 05:39
    Message # 4878982


    I'm having fun with my 3-masted junk schooner Madam Wong, anchored here at Magnetic Island, QLD Australia!

    Sometimes I wish our boat will sail upwind a bit better. And I come up with some ideas...Here's a junk sail with camber; I don't believe anybody's written about this yet.

    Take the updated square rig, Dynarig, and format it to a junk sail. Look up s/v Maltese Falcon if you want an example (probably the only example).

    Build curved battens (not straight or bendy). Somehow support the battens so it does not droop (like a sad frown :-( drooping). Don't built it with a rotating mast with curved "spreaders" like Maltese....

    Then attach the mast to the middle of the battens. So you won't have a luff or leech; you have either port leech or starboard leech, depending on wind direction.

    You use single sheeting, but double up. So single sheeting for both leeches. 

    I haven't figured out how to do positive stagger on curved battens; maybe extend the upper battens?

    When, tacking you have to rotate the sail 120 degrees. Less sail rotating for gybing.

    Running down wind, its best to spread the sheet anchor points as far apart as possible. 

    What do you think???

  • 04 Jun 2017 07:20
    Reply # 4879041 on 4878982

    This has been thought about, and written about, but as I'm cruising without my computer, I can't check up on when and where. Try the Harry Proa forum.

    The big problem is that when the sail is not stalled, with the wind forward of the beam, the CP is well forward of the mast and there is overbalance. Thus, the "luff sheet" is the one that is loaded. I believe that there would be big problems with control.

       " ...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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