Reborn of 800 year old Song Dynasty junk

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  • 04 Apr 2018 08:42
    Reply # 6014579 on 6012918
    John Kwong wrote:

     For two year I have been looking for a wooden ocean going Chinese junk hull. The round bottom modern fishing junk hulls show low AVS (angle of vanishing stability) in the GZ curve. These hulls cannot satisfy me in stability. The V shaped hull of the wrecks of Song Dynasty (960-1279) and Yuan Dynasty (1271-1368) in the museum caught my attention but unfortunately they were incomplete. Last December I cam across an article written by Australian maritime archaelogist Jeremy Green and Nick Burningham. They did a very detail survey of the Quanzhou wreck in the 1983-94. I built a computer model and performed stability and resistance analysis from their lines plan and WOW its the perfect hull I have been looking for! This 800 year old hull showed great stability and low resistance. Before we find enough funds to reconstruct the junk in full size (28m LOA), we decided to use our own savings to build a small test model of 7.5m LOA. The design is 80% based on Australian survey and 10% based on a 1974 drawing offered from a retired staff of the company who did the excavation in the 70's. 10% change by me in fairing the hull and increasing the freeboard which is too low in shrinking a large boat to 1/4 of its size. We will be purchasing timber and starting the construction in a week's time. Will keep posted. (Images attached: Reconstructed computer model, Stability GZ curve CG at waterline of the 7.5m junk, CAD photo survey checking with Jeremy lines)

    John: this sounds so exciting!  I can't wait to see the progress and watch the boat grow.
  • 03 Apr 2018 16:12
    Reply # 6013158 on 6012918
    Deleted user

    Woah.  It looks like I've found a new, "Gotta follow it as it goes" project.  

  • 03 Apr 2018 15:48
    Reply # 6013110 on 6012918

    That's great, John! The computer model is showing a nice bow transom, similar to SibLim's - what does the stern look like?

  • 03 Apr 2018 13:53
    Message # 6012918

     For two year I have been looking for a wooden ocean going Chinese junk hull. The round bottom modern fishing junk hulls show low AVS (angle of vanishing stability) in the GZ curve. These hulls cannot satisfy me in stability. The V shaped hull of the wrecks of Song Dynasty (960-1279) and Yuan Dynasty (1271-1368) in the museum caught my attention but unfortunately they were incomplete. Last December I cam across an article written by Australian maritime archaelogist Jeremy Green and Nick Burningham. They did a very detail survey of the Quanzhou wreck in the 1983-94. I built a computer model and performed stability and resistance analysis from their lines plan and WOW its the perfect hull I have been looking for! This 800 year old hull showed great stability and low resistance. Before we find enough funds to reconstruct the junk in full size (28m LOA), we decided to use our own savings to build a small test model of 7.5m LOA. The design is 80% based on Australian survey and 10% based on a 1974 drawing offered from a retired staff of the company who did the excavation in the 70's. 10% change by me in fairing the hull and increasing the freeboard which is too low in shrinking a large boat to 1/4 of its size. We will be purchasing timber and starting the construction in a week's time. Will keep posted. (Images attached: Reconstructed computer model, Stability GZ curve CG at waterline of the 7.5m junk, CAD photo survey checking with Jeremy lines)

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    Last modified: 03 Apr 2018 22:36 | Anonymous member
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