SWATH concept design - Feedback wanted

Discussion in 'Boat Design' started by whataboutyou, Aug 18, 2016.

  1. whataboutyou
    Joined: Aug 2016
    Posts: 22
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Canada

    whataboutyou Junior Member

    ps. how about i just draw it then build it like I draw it. Sounds better to me.

    As I get down to a shape that can handle what I want it to be able to do. My strategy is to take the displacement below the water line, figure out how buoyant I need it to be (In terms of density), then see how much material I can use to make up for that buoyancy; and where my shape needs re-scaling.

    Personally I'm a visual mathematician so for me it makes sense for me to think in terms of shapes.
     
  2. cmckesson
    Joined: Jun 2008
    Posts: 161
    Likes: 7, Points: 18, Legacy Rep: 55
    Location: Vancouver BC

    cmckesson Naval Architect

    The hard part is knowing where to put that material, in order to come up with a boat that doesn't break apart.
     
  3. Rurudyne
    Joined: Mar 2014
    Posts: 1,170
    Likes: 40, Points: 48, Legacy Rep: 155
    Location: North Texas

    Rurudyne Senior Member

  4. whataboutyou
    Joined: Aug 2016
    Posts: 22
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Canada

    whataboutyou Junior Member

  5. Ad Hoc
    Joined: Oct 2008
    Posts: 7,047
    Likes: 975, Points: 113, Legacy Rep: 2488
    Location: Japan

    Ad Hoc Naval Architect

    That's the easy part ;)
     
  6. SamSam
    Joined: Feb 2005
    Posts: 3,900
    Likes: 197, Points: 63, Legacy Rep: 971
    Location: Coastal Georgia

    SamSam Senior Member

    You're confusing authority and experts. Authorities generally have power, experts generally have knowledge. Good authorities, when making decisions and issuing orders, rely on experts knowledge and experience to guide them.

    Aside from that, I'm wondering how much of what you need to know you actually know. As Adhoc says, it seems you're just making pretty pictures with no consideration for the strength of materials or their configurations, the weight of various components of the boat or any consideration of the mathematics of displacement.

    Do you understand this question can't be answered with just the information you supplied? You've cut the displacement by 66% because of cost, with seemingly no regard to how much displacement is actually needed.

    A person has to be reasonable. Casting and building a pneumatic turbine? It's fine to know and understand how they are made, but building one yourself is not reasonable if you ever want to actually get on the water.
     
  7. whataboutyou
    Joined: Aug 2016
    Posts: 22
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Canada

    whataboutyou Junior Member

    "Because your own strength is unequal to the task, do not assume that it is beyond the powers of man; but if anything is within the powers and province of man, believe that it is within your own compass also."

    "Begin--to begin is half the work, let half still remain; again begin this, and thou wilt have finished."
    - Marcus Aurelius

    My method will be just to keep trying.
     
  8. whataboutyou
    Joined: Aug 2016
    Posts: 22
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Canada

    whataboutyou Junior Member

    update

    [​IMG]

    K i think I have a shape that I can start to dissect
     
  9. kerosene
    Joined: Jul 2006
    Posts: 1,159
    Likes: 124, Points: 63, Legacy Rep: 358
    Location: finland

    kerosene Senior Member

    I love the disciplined methodical approach.
     
  10. Ad Hoc
    Joined: Oct 2008
    Posts: 7,047
    Likes: 975, Points: 113, Legacy Rep: 2488
    Location: Japan

    Ad Hoc Naval Architect

    .. ;)
     
  11. rasorinc
    Joined: Nov 2007
    Posts: 1,854
    Likes: 71, Points: 48, Legacy Rep: 896
    Location: OREGON

    rasorinc Senior Member

    Looks like it might float. sorta
     
  12. rasorinc
    Joined: Nov 2007
    Posts: 1,854
    Likes: 71, Points: 48, Legacy Rep: 896
    Location: OREGON

    rasorinc Senior Member

  13. Rurudyne
    Joined: Mar 2014
    Posts: 1,170
    Likes: 40, Points: 48, Legacy Rep: 155
    Location: North Texas

    Rurudyne Senior Member

  14. mydauphin
    Joined: Apr 2007
    Posts: 2,164
    Likes: 53, Points: 48, Legacy Rep: 575
    Location: Florida

    mydauphin Senior Member

    Swath like catamarans really work better the bigger they are. The smaller it is the wider by ratio it must be. Think of a Swath like a big table, you want it big enough so that no corner will ever experience greater than than say 15% of weight of anything is not part of its regular cg. A sail or windmill could drastically effect this. Also, from a build point of view the weight of every component becomes verycritical, far more than mono hull. Also consider the strength of the materials involved. I may be wrong but every Swath I have seen is made from steel for a reason.
     

  15. mydauphin
    Joined: Apr 2007
    Posts: 2,164
    Likes: 53, Points: 48, Legacy Rep: 575
    Location: Florida

    mydauphin Senior Member

    Btw, after several centuries of trial and error, the best ocean going ship design, that can be built for less cost and materials, less maintenance, and will actually survive a storm is..... wait for this.... a monohull...
     
Loading...
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.