Designing a boat in Freeship

Discussion in 'Boat Design' started by Sandertn, Sep 30, 2015.

  1. Sandertn
    Joined: Sep 2015
    Posts: 5
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Norway

    Sandertn Junior Member

    Hi, I have been given a task at school where im supposed to design a boat in Freeship. I have absolutely no idea how to do this. Im looking for some good tips, possibly some renderings that can guide me. The boat cant be longer then 90cm, og it has to carry 9kg of weight. I`ll receive a motor for the boat later, and all I know about it is that its weak. My goal is the have a fast and stable boat. The main focus is its speed
     
  2. TANSL
    Joined: Sep 2011
    Posts: 6,197
    Likes: 291, Points: 93, Legacy Rep: 300
    Location: Spain

    TANSL Senior Member

    Can I do a trick question ?. You want to learn to design a boat with Freeship or want to learn how to design a boat?. The knowledge required in either case are totally different.
     
  3. Sandertn
    Joined: Sep 2015
    Posts: 5
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Norway

    Sandertn Junior Member

    I want to learn to design a boat with freeship. However I want some basic knowledge's about normal boat design too :p
     
  4. TANSL
    Joined: Sep 2011
    Posts: 6,197
    Likes: 291, Points: 93, Legacy Rep: 300
    Location: Spain

    TANSL Senior Member

    So the best thing to do is to carefully read the Freeship's User Manual and Tutorials. If such documentation is not enough, do not hesitate, switch to another software.
     
  5. Leo Lazauskas
    Joined: Jan 2002
    Posts: 2,696
    Likes: 148, Points: 63, Legacy Rep: 2229
    Location: Adelaide, South Australia

    Leo Lazauskas Senior Member

    Freeship might not allow you to work with such small boats.
    You would be better off working with a 90m long hull and scale it back to 90cm
    when you have finished.
     
  6. daiquiri
    Joined: May 2004
    Posts: 5,372
    Likes: 247, Points: 73, Legacy Rep: 3380
    Location: Italy (Garda Lake) and Croatia (Istria)

    daiquiri Engineering and Design

    That would be a nice exercise in usage of scaling factors, especially when it comes to displacement, CoG and stability calculations. :)
     
  7. Leo Lazauskas
    Joined: Jan 2002
    Posts: 2,696
    Likes: 148, Points: 63, Legacy Rep: 2229
    Location: Adelaide, South Australia

    Leo Lazauskas Senior Member

    It certainly would be for someone "designing" a real boat!
    I think the poster just needs Freeship as a drawing aid at this stage so those
    practical details aren't important. I'm not sure if there are stability regulations
    for passenger vessels of 90cm length. :)
     
  8. nzboy
    Joined: Apr 2011
    Posts: 154
    Likes: 4, Points: 18, Legacy Rep: 36
    Location: nz

    nzboy Senior Member

    I found when designing models for others in freeship scaling by 10 works well eg 90cm to 9 metres as freeship doesn't handle a 1metre boat of course volume and displacement is cubed
     
    Last edited: Sep 30, 2015
  9. daiquiri
    Joined: May 2004
    Posts: 5,372
    Likes: 247, Points: 73, Legacy Rep: 3380
    Location: Italy (Garda Lake) and Croatia (Istria)

    daiquiri Engineering and Design

    You telling me that we have just found a loophole?

    [​IMG]
     
  10. kerosene
    Joined: Jul 2006
    Posts: 1,061
    Likes: 66, Points: 48, Legacy Rep: 358
    Location: finland

    kerosene Senior Member

    Make it 900cm in freeship and make the displacement (essentially weight) to be 9,5kg (boat + load) raised to the power of three (9,5*9,5*9,5), its roughly 860kg. Start with that.

    Make the waterline as long as possible (near 90 cm), make bottom leave the water in the rear. Keep it narrow and smooth (as allowed by the weight)
     

  11. Oleboynow

    Oleboynow Previous Member

    freeship was kind to me, I drew her in 07, apart from cabin which a friend did
    I lifted lines from a known design, proven , world circumnavigater and scaled her from a sawn off(plumb transom) 32 feet to 38 feet
    I love this boat because she does not slam upwind like the OVNIS do, she also is very powerful upwind and does not roll on those Swells that always seem to be there in Yasawas and everywhere else
    I then finished her in R4, and have picked it up again
    oh, I had permission to use lines
    The designer was the famous R Clark, UK, well known ship like Carita and British steel(I seem to remember)
    Oh and scheel keel I paid a man in Rotterdam to do
    The rudder is not good and it is coming off
    The bottom plate run will be 8mm alal, chine run 6mm, topsides run 6mm and deck which has considerable compound with very high crown 5 or 6
    Frames all ring from 10 pl at 600m cl and no stringers which I have always detested in builds
    Disp 9300kg ballast poured in tungsten(joke)
    The idea is for a very powerful stiff Horn yacht
     

    Attached Files:

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.