small planing hull/jetboat

DELFTship forum Hull modeling small planing hull/jetboat

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    • #35471
      AvatarJamie
      Participant

      hey there,
      is there anyone on here who has built a planing hull from aluminum? i am drawing a hull in freeship 2.6 with the view to cutting it out on a cnc plasma table. when i draw it up and develop plates it says up to 3 percent face and edge stress. is there anyone who has experience with this? will it be ok or do i need to somehow fix this before cutting my sheets? thanks so much anyone you will be my hero!

    • #35472
      AvatarJürgen Sass
      Participant

      Attach your file to show your aluminum boat.
      It facilitates a professional assessment of the project.
      Probably it is possible to add lines slightly differently to achieve full developable surface. I know it as I have designed several aluminium boats. See more at my website http://www.sassdesign.net

      js

    • #35473
      AvatarJamie
      Participant

      i have built plenty of boats and i know how they can look. but it seems when i draw them how ive built them before the computer says its too much stress. dont know what going on. seems it has to be a square tub before the computer says its ok help! haha thanks

    • #35475
      AvatarJürgen Sass
      Participant

      Development.jpg
      Here you can see how the lines should be added to get a developable surface

    • #35479
      AvatarJamie
      Participant

      this would not work for a jet boat… it needs that flat triangle bit on the bottom. here is a picture of something similar. it should be possible to draw this on freeship and then develope plates right?
      how would you build this boat you have drawn from aluminum? the bow section would be almost impossible in one piece. ive seen guys build these hulls that are in the pictures below in three pieces. hull bottom and two sides. all bent and formed with a break then welded together.

    • #35481
      AvatarJürgen Sass
      Participant

      Y621jpg.JPG

      That boat is built in aluminum.
      See attached image

      js

    • #35485
      AvatarJamie
      Participant

      so you used this program freeship or delftship to draw and cut the plates?

    • #35488
      AvatarJürgen Sass
      Participant

      and much more can be done if you understand how devepments works
      js

      Petrusdesign0155samanstllningb.jpg

      Y621_developmentsjpg.JPG

    • #35490
      AvatarJamie
      Participant

      how do you get your plates to stay joined like in the rowing skiff? the sides on my jet boat should be able to do this but the program has not done it for me yet. ive done the tutorial and have a fairly good understanding. is the somewhere else i can learn more from?

    • #35558
      AvatarJamie
      Participant

      hey there sassdesign,
      thank you so much for you help.
      i just thought you might be interested i have figured out what i think you were trying ot teach me about developable surfaces. i will attach my plans here so you can see.

      i have also started construction of my boat and everything seems to be going as planned.

      here is my design pics

      https://www.facebook.com/media/set/?set=a.10150754635699657.496813.835974656&type=1&l=7629fc1221

      and here are my construction pics

      https://www.facebook.com/media/set/?set=a.10150859475474657.510222.835974656&type=1&l=45b4fafe59

      once again thank you

      all the best

      Jamie

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