Designing without curvature

Discussion in 'Boat Design' started by richardmg9, Dec 10, 2018.

  1. richardmg9
    Joined: Dec 2018
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    Location: florida

    richardmg9 Junior Member

    Does anyone have any tips for this? I find it very challenging to design anything in solidworks, on paper, or with models which looks the way I want without curvature. I would love to have something in cad that would allow tweaking of a hull while forcing zero curvature. Thanks

    Edit: Sorry for the late reply, I don't have reliable internet.

    Thanks for all the replies, and I do not mean a boat without curves, I mean compound curves. Sorry for the confusion, I thought curvature was synonymous with coumpound curves.

    To be even more clear, I am looking for tips/tricks when designing a hull which can be made of steel/aluminum without forming or rolling plates.
     
    Last edited: Dec 14, 2018
  2. JamesG123
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    JamesG123 Senior Member

    Uh... work with nothing but the mesh verticies? Or primative polygon shapes?
     
  3. Mr Efficiency
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    Mr Efficiency Senior Member

    Confusing. You have a horror of anything with curves, but can't get the "shape you want" without them ? I don't understand.
     
  4. Rurudyne
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    Rurudyne Senior Member

    Do you mean without compound curvature?
     
  5. Mr Efficiency
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    Mr Efficiency Senior Member

    Any curvature at all, I surmise. Seems a simple exercise to design something with no curves, on paper, a lot simpler than with curves, but he says he can't do it and get the shape he wants.
     
  6. upchurchmr
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    upchurchmr Senior Member

    My immediate reaction is that this is the dumbest idea I ever heard.
    Second thought is that I don't understand what you are trying to do.

    How about a little more detail?
    Are you trying to design a boat hull or pencils?

    Why?
     
  7. Mr Efficiency
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    Mr Efficiency Senior Member

    Whilst designing a boat without curvature would be easily enough done, and could even perform reasonably well in use, the actual construction might be more difficult than a design using curves, and especially if there be a multiplicity of individual flat facets to the design, which would be pretty well necessary to function well. It is easier to construct something with continuous panels, a curved boat can be made from three panels, a boat cannot be made from three flat panels. And as for "looking the way I want", only answerable by the designer.
     
  8. philSweet
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    philSweet Senior Member

    The last phrase, "forcing zero curvature", strongly suggests he's talking about Gaussian curvature, meaning using developable surfaces.

    You can't really force zero curvature over an entire structure such as a hull with software because it tends to be under constrained mathematically. You have to design the developable panels using classical methods and then figure out how to best render them digestible to your software of choice. I use Rabl's method, and the post below shows how I work the result into FreeShip.

    Development of intersection of two cones and two planes. https://www.boatdesign.net/threads/development-of-intersection-of-two-cones-and-two-planes.51910/#post-713716
     
    Last edited: Dec 11, 2018
    JosephT likes this.
  9. Mr Efficiency
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    Mr Efficiency Senior Member

    The OP can't even be bothered to clarify, seemingly. Why ask in the first place.
     
  10. JamesG123
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    JamesG123 Senior Member

    'Floridaman' strikes again!
     
  11. SamSam
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    SamSam Senior Member

    About CAD or solidworks, I know nothing. But boats without curves, I know this...
    [​IMG]
     
  12. upchurchmr
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    upchurchmr Senior Member

    What could be wrong with that!
     
  13. SamSam
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    SamSam Senior Member

    The Mrs. might object..? The napkins might be lost? The table cloth could be used for a Bimini though and there's room for at least a few of the chairs. It looks to be an excellent flats boat.
     
  14. upchurchmr
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    upchurchmr Senior Member

    You could hang lots of flags.
     

  15. Angélique
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    Angélique aka Angel (only by name)

    Last edited: Dec 13, 2018
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