Boat project 14ft catamaran flats

Discussion in 'Boat Design' started by EirikNorway, Jun 2, 2012.

  1. Wavewacker
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    Wavewacker Senior Member

    Also, you might refrain from spitting into the wind unless you are on the way to the outhouse to clean up. :)

    Otherwise, I like it, the transom does look a it much to me for a smaller craft.......
     
  2. EirikNorway
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    EirikNorway Junior Member

    The idea is that the boat gets up on the smaller hull underneath for fast economy cruising, and still perform in Norwegian conditions, with waves. Flats is maybee the opposite what we are building then. Posting pictures of jig. Will print templates soon.

    Eirik
     
  3. EirikNorway
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    EirikNorway Junior Member

    The back seat to transom is 700mm deep. hopefully good for hand held and steering wheel. No splash well. Im printing a jig for the transom to give it a curve. The motor mounts with a jackplate. Transom thicknes 45mm or 36mm glasfiber reinforced
    plywood 9mm.
    Power distrobution: Transom mounts to keel, jackplate mounts are backed by an alluminum/steel sheet10mm(inside of wall). Wall thickness 10mm+glassfiber

    Eirik
     
  4. EirikNorway
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    EirikNorway Junior Member

  5. EirikNorway
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    Location: Norway, Oslo

    EirikNorway Junior Member

  6. EirikNorway
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    EirikNorway Junior Member

  7. messabout
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    messabout Senior Member

    Erick, you are clearly an accomplished craftsman. A lot of careful and skillful work has surely gone into that project. That will definitely be a sexy looking boat. Whether it works well remains to be seen.

    Some of the pictures show the backbone making a curve all the way to the transom. Other pictures make it appear straight. ???? I hope that I am wrong about the curve in profile.

    Please keep us posted and keep up the good work, it is impressive. (this is not to say that I approve the design work.)
     
  8. EirikNorway
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    Location: Norway, Oslo

    EirikNorway Junior Member

    More pictures from the build process. When the bottom of the boat is faired were going to seal the bottom and inside with epoxy. Then we are going to test if the freeboard are suficciently high. If not we can add a little more.
    Looking foreward to testing the hull, for now with a 20hp two stroke yamaha.

    http://www.flickr.com/photos/7682263@N02/sets/72157637315644444/

    Eirik
     
  9. EirikNorway
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    EirikNorway Junior Member

  10. Mr Efficiency
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    Mr Efficiency Senior Member

    Where is the catamaran ?
     
  11. EirikNorway
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    EirikNorway Junior Member

    Started the thread when i drew the boat. Then i wanted to build a catamaran trihull something. As the design progressed, it came to look more like a normal boat.
    I have some modellpictures of the catamaran on the flickr page.

    Eirik
     
  12. Mr Efficiency
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    Mr Efficiency Senior Member

    OK, looked at some of the later pics and thought I must have been on the wrong page or something, good luck with it. :D
     
  13. tom28571
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    tom28571 Senior Member

    This is much like an extreme lapstrake (reversed lapstrake or lateral steps) on the hull bottom. Such boats with more lateral steps have been successful in offshore racing but without the concave sections you show. An article in these boats was in Professional Boatbuilder magazine a few years ago and the purpose was to provide extra lift and reduced wetted surface at high speed while allowing a deep V hull. It is another design that offers similar results to the more normal lifting strakes found on most deep V hulls. I see no real advantage to the concave sections in your boat and possible disadvantages. Whenever extra wetted surface or increased frictonal drag is added to a planing boat, it must pay its way in better performance in some other area and that is not obvious to me. Flat lateral surfaces would be simpler. Art in a boat must first meet the performance objectives or at least not be a detraction or it is just "art".

    I agree with the negative comments about the curved sponsons causing grief.
     
  14. EirikNorway
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    EirikNorway Junior Member

    We considered to add lifting strakes on the end of each lateral step and between the keel and the first step. We decided to try it without the liftingstake first. Lets see how it perform in the water, that is going to be exiting. At least for us.
    Thank you for the comments.

    Eirik
     

  15. messabout
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    messabout Senior Member

    I do hope the your use of the word; exiting is not the last that we hear from you.

    Just joking Erik, I know that you meant exciting, not exiting.

    Best of luck and I trust that you will enjoy your brain child.
     
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