Slocum and the Yawl Rig

<< First  < Prev   1   2   Next >  Last >> 
  • 26 Jan 2016 23:39
    Reply # 3783827 on 3782030
    Deleted user
    Asmat Downey wrote:
    Timothy Rumbinas wrote:
    Asmat Downey wrote:The yawl's mizzen would be a useful sail, helping a junk rigged vessel to lie quietly at anchor when the windage of a mast stepped well forward would tend to make her hunt around. Where would you put a self-steering wind-vane, though?
    The Vita 30 has a transom that would easily accommodate this. The mizzen could be stepped in a fixture bolted or welded to the inner part of the transom, and the pendulum wind steering could be mounted on flat bars behind it. It's really simple. Funny you should mention this, as I spend a few hours sketching the plan out last night.


    I think I see. The mizzen sail would be furled while the wind-vane is shipped and the wind-vane would be unshipped while the mizzen is set as a riding sail.
    I think I could get the mizzen and this to live together in harmony. The vane isn't all that tall. http://www.windvaneselfsteering.co.uk/
  • 26 Jan 2016 17:03
    Reply # 3782947 on 3780976
    Deleted user

    Michael Kasten, a designer for whom I have considerable respect, did an analysis of Spray which can be found here: http://www.kastenmarine.com/spray.htm. The upshot of the piece is that Spray, despite her sailing qualities, was probably the last vessel that that one would choose for a circumnavigation! Slocum, as with many of us, simply adapted what he had on hand -- in his case an oyster dragger that was rotting in a field. Spray was a boat which fit his budget! He had taken the same approach with Liberdade.

    Kasten's article is short, dense with information, and to the point.

    Mr. Kasten has a sizable collection of useful and informative articles on boat design which can be found here: http://www.kastenmarine.com/articles.htm. His thoughts on the junk rig are worth reading.

  • 26 Jan 2016 13:06
    Reply # 3782045 on 3780976
    Anonymous member (Administrator)

    I think much of the reason for Spray’s balance and ability to track well, even downwind, is based on the fact that she is a typical “cod’s head and mackerel’s tail” design, dating back to early in the 19th century. Remember, Slocum rebuilt her from and old, almost wreck, adding more freeboard and also a deck (which I am not sure if she had to begin with).

    The main frame on these old designs sits far forward, so they will not tend to round up (to starboard) if suddenly heeled over (to port). Most modern boats have the main frame (too far) aft of the middle. These are faster to windward, but need much more attention to keep them on course downwind. They broach frequently, but with fixed ballast, and being fully decked, they mostly recover without harm.

    Just about all open, traditional workboats in Norway were and are built with moderate cod’s head and mackerel’s tail, with maximum beam almost at the fore thwart, like this one: Being open, they depended on good tracking and resistance against broaching to survive. I have sailed such færings quite a bit, and they surely track well, even with quite some swell on the quarter.

    Under this link is a photo show of an Ofot-færing being built, and then sailed.

    http://www.fosen.fhs.no/videoer/165-a-bygge-en-faering

    Cheers,
    Arne

     

    Last modified: 26 Jan 2016 13:08 | Anonymous member (Administrator)
  • 26 Jan 2016 13:04
    Reply # 3782041 on 3780976

    Exact replicas of Spray have been built. It would be interesting to know if they have the self steering ability claimed by Slocum for the original. His extended bowsprit must have helped keep her on track downwind. Does anybody have direct experience of a boat that can do this?

  • 26 Jan 2016 12:52
    Reply # 3782030 on 3781416
    Timothy Rumbinas wrote:
    Asmat Downey wrote:The yawl's mizzen would be a useful sail, helping a junk rigged vessel to lie quietly at anchor when the windage of a mast stepped well forward would tend to make her hunt around. Where would you put a self-steering wind-vane, though?
    The Vita 30 has a transom that would easily accommodate this. The mizzen could be stepped in a fixture bolted or welded to the inner part of the transom, and the pendulum wind steering could be mounted on flat bars behind it. It's really simple. Funny you should mention this, as I spend a few hours sketching the plan out last night.


    I think I see. The mizzen sail would be furled while the wind-vane is shipped and the wind-vane would be unshipped while the mizzen is set as a riding sail.
  • 26 Jan 2016 08:01
    Reply # 3781663 on 3780976
    Anonymous

    Slocum gave a lot of credit to the boat.

    E.g.

    "I have given in the plans of the Spray the dimensions of such a ship as I should call seaworthy in all conditions of weather and on all seas".

    Chris

    Last modified: 26 Jan 2016 08:11 | Anonymous
  • 26 Jan 2016 06:10
    Reply # 3781472 on 3781464
    Deleted user
    Annie Hill wrote:
    Timothy Rumbinas wrote:Slocum's "Spray" is seen by some as a miracle of design.

    Why not a junk yawl?
    Hmmm.  As is so often the case, the boat is given the credit that belongs to the skipper.

    As to your second point: Shemaya Laurel seems more than happy with hers!

    It hurts no one to give credit to the boat, except around the bar.
  • 26 Jan 2016 06:00
    Reply # 3781467 on 3781102
    Deleted user
    Webmaster JRA wrote:

    Timothy

    The piece you are referring to is "A Critical Analysis of the Yawl Spray" by Cipriano Andrade, Jr., and appeared in Rudder Magazine in June 1909. It is also printed as an appendix in Guy Bernardin's "Sailing Around the World: A Family Retraces Joshua Slocum's Voyage" published in 2002. And also, as an appendix in Ken Slack's wonderful book "In the wake of the SPRAY" published in 1966. I have a copy in front of me.

    Chris

    Spot on. That's the piece I read. "If she looks right, she'll fly right." 
  • 26 Jan 2016 05:55
    Reply # 3781464 on 3780976
    Timothy Rumbinas wrote:Slocum's "Spray" is seen by some as a miracle of design.

    Why not a junk yawl?
    Hmmm.  As is so often the case, the boat is given the credit that belongs to the skipper.

    As to your second point: Shemaya Laurel seems more than happy with hers!

  • 26 Jan 2016 03:34
    Reply # 3781416 on 3781099
    Deleted user
    Asmat Downey wrote:The yawl's mizzen would be a useful sail, helping a junk rigged vessel to lie quietly at anchor when the windage of a mast stepped well forward would tend to make her hunt around. Where would you put a self-steering wind-vane, though?
    The Vita 30 has a transom that would easily accommodate this. The mizzen could be stepped in a fixture bolted or welded to the inner part of the transom, and the pendulum wind steering could be mounted on flat bars behind it. It's really simple. Funny you should mention this, as I spend a few hours sketching the plan out last night.


<< First  < Prev   1   2   Next >  Last >> 
       " ...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