I'm new, and I want to build a concept boat

Discussion in 'Boat Design' started by Schoonner, Dec 7, 2011.

  1. Schoonner
    Joined: Nov 2011
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    Schoonner Senior Member

    I love sailboats. Especially cruisers you can live on. I have a design that I will soon be making into a 3d model. I call my design a "SLumpy" design. Technically it has more than one keel. The prow also acts somewhat like a keel and will have some ballast.

    Would it be too difficult to build something like this from wood covered with fiberglass?
    [​IMG]

    Uploaded with ImageShack.us

    Wood IS stronger than fiberglass right!?! I'm new to ship building, but I understand physics a little.

    EDIT:: I think it should be about 36' long and 12' wide. picture is NOT to scale, think of it being on a bar napkin. =0)
     
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  2. messabout
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    messabout Senior Member

    Lose the ballast at the front of the boat. That is an ill advised idea. Every effort should be made to minimize the weight at the ends of the boat. That includes the weight of items that might be stored near the ends. A 36 foot boat that has a 12 foot beam is kind of fatty. Performance is not likely to be worthy of honest bragging at the yacht club bar.

    Yes you can build this in wood covered with FRP.,,,, I would advise against the design but not the construction material.
     
  3. Schoonner
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    Schoonner Senior Member

    The hull is probably differently shaped than you think, but then nothing is traditional on the design. Perhaps I'm wrong, but the harder it will be for the yacht to tip right or left, the more side force you can safely put on the masts/sails and therefore, the faster you can go. The design looks to me like it may be more dependent on speed in the water for the real action to happen, so I don't know how stable it really will be. Nearly two thirds of the entire hull will be 3 ft across or less. The cabin and berths will only 'look' like a normal cruiser inside. =0) I guess I should show you a picture of the bulkhead at it's widest point. I'll go make one...
     
  4. gonzo
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    gonzo Senior Member

    It looks like the old Walt Disney submarine in 20000 leagues under the sea. Captain Nemo would be right at home. All the lumps and edges will make it hard to build. Also, it will have a lot of drag and handle horribly. But, there is only one sure way to find out and learn: build it.
     
  5. Schoonner
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    Schoonner Senior Member

    I made a wooden model. It was not easy, but I've never done a model before. Unfortunately, the glue came undone when I was testing it on the water and it needs to be completely re built from the keel up. I just started testing it with a mast and weights to see if I could get it to capsize. the model has the copper out of stripped speaker wire for a ballast and would be nearly 6000 lbs. I think that the ballast in the prow might have been causing me to think I need a bigger rudder. The following is a picture of the cross section at the widest point. I took the bottom of a triple hull fishing boat and tweaked it a LOT!

    EDIT:: The blue line is just below the intended water line at the widest part.
    [​IMG]

    Uploaded with ImageShack.us
     
  6. PAR
    Joined: Nov 2003
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    PAR Yacht Designer/Builder

    Do yourself a big favor and absorb the contents of "Principles of Yacht Design". It can be had in the book store here or your favorite book seller. I say this because there's so many things wrong about your design that insulting you with a list just isn't healthy. Once you have a much better handle on the reasons we shape things the way we do, the best advice you could receive is to make your first design very similar to known and proven concepts. Jumping way out on the design limb, right out of the box, is just a guarantee that you'll break it.
     
  7. Schoonner
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    Schoonner Senior Member

    And this is what I thought it might do hard over in strong wind.

    [​IMG]

    Uploaded with ImageShack.us
     
  8. michael pierzga
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    michael pierzga Senior Member

    Actually ,it may be more seaworthy when inverted.
     
  9. Schoonner
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    Schoonner Senior Member

  10. michael pierzga
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    michael pierzga Senior Member

    Oh the internet are many free designs.


    http://www.pkboatplans.com/K-39.html

    I would suggest that you take one of these free designs, then redraw it with your own hand. This exercise will teach you very much .
     
  11. Schoonner
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    Schoonner Senior Member

    ROFL!!! I LIKE IT!!! Then I could chase ppl away with just enough ballast to make it ride with just about the whole dorsal fin sticking out and wearing scuba gear.
     
  12. Schoonner
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    Schoonner Senior Member

    Cool!! I That's perfect.
     
  13. Schoonner
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    Schoonner Senior Member

  14. Schoonner
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    Schoonner Senior Member

    Wait, would it be more difficult to steer because it displaces water farther forward?
     

  15. PAR
    Joined: Nov 2003
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    PAR Yacht Designer/Builder

    You need an education and it would be helpful if you tossed the "Etch A Sketch" in favor of more conventional drawing tools.

    [​IMG]
     
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