New rudder for Zebedee

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  • 07 Feb 2019 08:19
    Reply # 7151393 on 7141657
    Anonymous wrote:

    A photo of Zebedee s new rudder before coppercoating. .


    Thank you Alan :-)
  • 02 Feb 2019 09:26
    Reply # 7142248 on 7141657
    Anonymous wrote:

    A photo of Zebedee s new rudder before coppercoating. .


    Very good idea Alan to add winglets to your ruder.

    I hope to meet you again in the Bay of Islands next March.Present time in Queenstown with our NZ familly.

    Bertrand

  • 01 Feb 2019 19:45
    Reply # 7141657 on 6899643

    A photo of Zebedee s new rudder before coppercoating. .

  • 01 Feb 2019 08:42
    Reply # 7140766 on 6899643

    Can I also just say. ..how v v  grateful to Arne etc. Your ruthlessly logical thinking really works! !!!!! Paul was right up there too. .After all LC s performance was the initial evidence. ..and both sources suggested 15 %! !  Greater camber for the sails might well be the way to go!  Isn't it great that people give it a go?   

  • 01 Feb 2019 08:35
    Reply # 7140750 on 6899643

    I think my reply was lost. Zebedee s  performance has improved dramatically. .just as Annie described. I was in rough conditions full sail mind , but was able to tack , which would have been impossible .

    Before,  if I had tried to gain speed by upping the helm Zebedee would simply have rounded up. Now,  he gains a lot of speed which makes going about happen

    . I think this is because the rudder is no longer producing turbulence.  The 15 % camberof the rudder  is stopping this effect. No idea how the top and bottom plates work but maybe just keeping the water flowing over the rudder. 

    The other big factor is my Arne type sails 12 % fore and 8 % main .

  • 29 Jan 2019 08:43
    Reply # 7134676 on 7086175
    I hope Alan remembered to take photos of the rudder before launching.

    Yes indeed! Would love to see them!

  • 24 Jan 2019 05:05
    Reply # 7113606 on 6899643

    I can understand the apparent dramatic improvement in the performance of Zebedee. When I built and installed the new rudder on Footprints there did seem to be an overall improvement in how the boat handled and performed. I suspect that with Footprints it was the proper foil shape for the new rudder, and closing up the large gap between the skeg and the leading edge of the rudder, which must have considerably reduced turbulence.

  • 23 Jan 2019 19:36
    Reply # 7086175 on 6899643
    Anonymous member (Administrator)

    Annie, it really gladdens me to read about Zebedee with the new rudder. 

    I can't help it, but have to quote myself from Chapter 2 of "The Cambered Panel Junk Rig":

    "Rudders

    Boat designers generally put too little effort in rudder design. In my opinion there is no such thing as too good rudder control. A good rudder not only makes the sailing trips more enjoyable, but also safer. It may be the difference between a successful or missed tack in a critical situation.

    On a junk-rigged boat, particularly on a sloop there is a need for an efficient rudder."

    I hope Alan remembered to take photos of the rudder before launching.

    Cheers, Arne

    Last modified: 23 Jan 2019 19:39 | Anonymous member (Administrator)
  • 23 Jan 2019 19:07
    Reply # 7084726 on 6899643

    Well,I steered Zebedee for the entire course in Tall Ships 2018 and again this year.  I would say that the rudder has transformed the boat.  He was very different to sail, noticeably faster, noticeably more responsive and, best of all, tacked reliably.  It was sheer joy to see him walking past other boats to windward and leaving them firmly in his wake when we were running.

    We had a bit of luck with wind shifts and an excellent team on board, this year, but even so, I think it was a completely honest win by Zebedee.  He'll never do it again -  his handicap will reflect the new rudder!!


  • 22 Jan 2019 21:59
    Reply # 7025401 on 6899643
    Anonymous member (Administrator)

    Alan, I have to repeat Bruno's main question:

    "Congratulations Alan for your performance in the Tall Ship Regatta.
    Do you think the modifications you made to the rudder had something to do with it?"


    This is what we want to know  -  the end result ;-) ...

    Arne

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