Chinese river ship launch failure

Discussion in 'All Things Boats & Boating' started by Brian@BNE, Oct 14, 2011.

  1. daiquiri
    Joined: May 2004
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    Location: Italy (Garda Lake) and Croatia (Istria)

    daiquiri Engineering and Design

    :D

    Is it the one visible in your gallery? I have left a comment on one of your latest pics, interesting but rather odd design... ;)
     
  2. mydauphin
    Joined: Apr 2007
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    Location: Florida

    mydauphin Senior Member

    Coolmike,

    How many airbags would be need to launch a 100' boat that weights 100,000 lbs? How much do these bags cost and can they be rented?

    thanks
     
  3. watchkeeper

    watchkeeper Previous Member

    Hi Coolmike, the yacht project was based on traditional Dhow hull, very deep (sheer to keel) big beam with almost full beam flat bottom but tricky bit was 900 deep full length keel.
    To help overcome the gradient I excavated back under the hull 1/3 length to help reduce pitch angle. Biggest concern was stopping the hull from toppling on her beam end and or breaking her back when going over the highest point - thats the ulcer making moment.
     
  4. tunnels

    tunnels Previous Member

    Is this simular to your hull shape ??

    Work in progress !!:p
     

    Attached Files:

  5. coolmike
    Joined: Oct 2011
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    Likes: 1, Points: 1, Legacy Rep: 10
    Location: China

    coolmike Engineering and Design

    Dear Mydauphin, 5 or 6 pieces air bags will be ok for launching, I have no idea of the breadth of your boat so can not offer the exact price. Estimated 5 pieces will cost you more than 10,000 USD. There is no formal airbag renting service in USA.We have some clients in USA, Titan salvage, Resolve marine,etc. Don't know if they would like to rent bags.
     
  6. coolmike
    Joined: Oct 2011
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    Likes: 1, Points: 1, Legacy Rep: 10
    Location: China

    coolmike Engineering and Design

    Watchkeeper, you did a good job. Yacht launch with air bags sometimes need to do some accessorial support for keel. Just like people transport yacht with SPMTs.
     
  7. philSweet
    Joined: May 2008
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    Location: Beaufort, SC and H'ville, NC

    philSweet Senior Member

  8. jehardiman
    Joined: Aug 2004
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    Location: Port Orchard, Washington, USA

    jehardiman Senior Member

    Notice they didn't show the bow strike or if there was a fore poppet..... Money says there was structural damage somewhere. But then launching way calculations have taken this into account for years. So either the guy got ordered to do it or he clanks when he walks.
     

  9. philSweet
    Joined: May 2008
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    Location: Beaufort, SC and H'ville, NC

    philSweet Senior Member

    That was my suspicion. Maybe they've been launching boats there for 500 years and sorted it out a foot at time as boats got bigger. <shrug> The video would make a nice intro (or finale) to a lecture on global strength considerations.

    Maybe by the time the bow falls off the edge there are enough sausage rollers piled up to catch it.
     
    Last edited: Sep 26, 2023
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