Building a TUG

Discussion in 'Boatbuilding' started by Barbaros, Aug 20, 2006.

  1. marshmat
    Joined: Apr 2005
    Posts: 4,127
    Likes: 149, Points: 63, Legacy Rep: 2043
    Location: Ontario

    marshmat Senior Member

    Hi Eric,
    A quick note about weight estimates. While the hull itself is a pretty big contributor, don't forget about engines, gearboxes, rudder gear, batteries.... and of course interior furnishings, doors, windows, stairs.... then there's cookware, appliances, foul-weather gear.... stuff really builds up. It's amazing just how much weight can be added to a boat through random stuff that you don't think of while designing. A 6-tonne hull, with a design displacement of 10 tonnes, has only four thousand kilos available for everything else- machinery, people, gear, etc. Getting the weight estimates accurate can save a lot of grief later.
     
  2. Barbaros
    Joined: Aug 2006
    Posts: 50
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    Location: France

    Barbaros Junior Member

    Displacement problem

    Hi Matt,

    Thanks for this precision. I was more vorying about the "ballast" and how to add some more weight to reach the required draft. But, I think you are right.
    Still, the draft (sinking the propeller to an acceptable depth) appears as more problematic then the rest.
    Even a steel hull remains very light.
    For exemple, Rhino shows 20 tons ( 20 000 X 2.2 = 44 000 pounds) for a draft of 1 meter (39 inches). All surfaces togehter including the windows (!) in steel weights only 7 or 8 tons (17 600 pounds) which is very light compared to 44 000 !!!.

    Regards
    Eric.
     

  3. marshmat
    Joined: Apr 2005
    Posts: 4,127
    Likes: 149, Points: 63, Legacy Rep: 2043
    Location: Ontario

    marshmat Senior Member

    Remember, it's always easier to add ballast than to remove inherent structural and machinery weight....
     
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