How to trace an existing lines plan? Looking for best technique

DELFTship forum Hull modeling How to trace an existing lines plan? Looking for best technique

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    • #37974
      Zeeland
      Participant

      Hi there,

      Just downloaded DELFTship, looks very promising. However, I really don’t know the right technique to trace an existing lines plan. The plan loaded well as background, but when I try to trace the plan the scene soon becomes like spaghetti :whistle:

      Does anybody knows of a good tutorial is this matter? I used this one, but it somehow ‘magically’ traces the original lines plan and continues without sufficient explanation how to achieve the right results.

      I’m trying to model an old ro-ro car ferry, very symmetrical design. The lines plan is of poor quality, but it’s the best I have. The attachment shows one of my ‘attempts’. What do I have to do with the ‘drag net’ for example? Sorry for these basic questions, I’m just looking for some good documentation to get started with tracing existing lines plans. Thanks for any tips.

    • #37976
      Robert Holme
      Participant

      What you have is a body plan, which is 1/3 of a Lines Plan. There should also be a profile and a plan of the vessel or you need further information in the form of Length overall/between perpendiculars, Beam, Draft and Displacement.

      I you only have numbers for the missing bits it is still possible to complete the exercise but without this you have insufficient information

      STYelta_Linesplan.jpg

      Best Regards
      Bob

    • #37980
      Zeeland
      Participant

      Thank you for the reply, Bob. I have (loaded) the other two parts of lines plan. When I try to accurately trace the front body plan, the waterlines on the plan don’t match. When I fix the waterlines in stead to match the original plan, the front body plan is wrong.

      On your DELFTship screenshot I notice you ‘closed’ the frames of the ship. Is that the best technique, to trace all the frames separately? I didn’t get that from the general documentation on modeling in DELFTship.

      And I don’t know about the dragnet, does that need to match something or are you free to move the points in order to get the black lines match the original lines plan? On the screenshots I did the latter and it became a bit of a mess.

    • #37982
      Robert Holme
      Participant

      The lines plan I used was one produced by Delftship.

      Yes it is often the case that using an existing lines plan which has probably been photocopied, reduced, extracted from a book etc. ends up distorted when finally loaded in Delftship.

      So a little poetic licence is needed to extrapolated the data. I use the plan and profile to develop the beam and length and these control points are not altered vertically when using the bodyplan. i.e. only the “green” points are moved along their Y axis to develop the hull shape.

      HTH
      Bob

      AF.jpg

    • #37984
      Robert Holme
      Participant

      Hi Zeeland,

      Attached is a jpg of a small coaster I found on the net.

      Procedure:
      1. Input basic project info and allow DS to create the hull.
      2. In Right Profile view add the lines plan profile and scale the plan to the model.
      3. Move the points already created to match the profile.
      4. Add points as required to match the stations and waterlines
      5. Switch to plan view and add the lines plan Plan view
      6. Move the hull outline control points to match the beam at each station.
      7. Switch to body plan view and add the lines plan body plan.
      8. Select the station points 1 at a time in profile view and move the along the Y axis in body plan view to match the station curves.

      It is important to select in profile view then switch to bodyplan view for moving because initially the points in bodyplan view look, as you know, very confusing.

      Flora.jpg

      HTH
      Regards
      Bob

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