S.M. U-1 (a new RC project)

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  • DrSchmidt
    Rear Admiral
    • Apr 2014
    • 1014

    #46
    Work on the molds has to wait while I'm waiting for new materials, but I can use the time to work a bit on the PE sheet that I plan to make for the detailing of the boat....
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    • DrSchmidt
      Rear Admiral
      • Apr 2014
      • 1014

      #47
      Placing the PE parts on the CAD-Model...already found some mistakes. Good check before investing money in the fabrication of PE.....

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      • DrSchmidt
        Rear Admiral
        • Apr 2014
        • 1014

        #48
        Some more...

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        • DrSchmidt
          Rear Admiral
          • Apr 2014
          • 1014

          #49
          Set up the third quarter of the mold. I'll put down the surface resin tomorrow and then I'll laminate the box later this week.

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          • DrSchmidt
            Rear Admiral
            • Apr 2014
            • 1014

            #50
            2,5 hours of laminating and 2 kg epoxy later, the third quarter is done....one more to go:

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            • JHapprich
              Captain
              • Oct 2017
              • 737

              #51
              Weather conditions should be ideal at your place, too!

              Looking forward to seeing pictures of the first hull!

              Jörg
              Last edited by JHapprich; 06-27-2024, 01:00 PM.

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              • DrSchmidt
                Rear Admiral
                • Apr 2014
                • 1014

                #52
                Sanded flat, box removed, and the remaining quarter of the master cleaned. Seams look good. So ready for the final lap…

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                • DrSchmidt
                  Rear Admiral
                  • Apr 2014
                  • 1014

                  #53
                  History repeating...the same sermon for the fourth and final quarter of the mold. Setting the Indexing pins and thread insets, building the wooden box, putting down in the surface resin and then, while the resin still is sticky, apply cotton flakes to create a coupling layer for the GRP that will be laid down later.

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                  • DrSchmidt
                    Rear Admiral
                    • Apr 2014
                    • 1014

                    #54
                    After a few weeks, 7 kg epoxy resin, 2 kg of surface resin, 2kg of glass fiber fabric and 22 liters of filling medium, the master of the S.M. U1 submarine, Germanys first military sub from 1906, is firmly entombed in its mold. Doesn’t look spectacular, but when everything went well, these will be excellent and robust molds to make a few hulls from. I‘ll wait a few more days to give everything a bit more time to cure before the most exciting part of the process is due: the opening of the molds.

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                    • redboat219
                      Admiral
                      • Dec 2008
                      • 2881

                      #55
                      This should be playing in the background https://youtu.be/e-QFj59PON4?si=idU9tC--x4lXW759
                      Make it simple, make strong, make it work!

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                      • DrSchmidt
                        Rear Admiral
                        • Apr 2014
                        • 1014

                        #56
                        Only when everything went well....still enough failure scenarioss. A stuck master, air bubbes, something got too hot dring curing....only when the master is out and all the seems look good, I'll be happy.

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                        • DrSchmidt
                          Rear Admiral
                          • Apr 2014
                          • 1014

                          #57
                          Opened the mold and removed the master of the U1. Did not go smoothly as the master got stuck, but in the end some persuasion with a hammer helped. Molds are O.K., not perfect, but I‘m confident that I‘ll be able to produce nice hulls out of it. Next is the application of the GRP backside and then we're in busyness.


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                          • He Who Shall Not Be Named
                            Moderator
                            • Aug 2008
                            • 12503

                            #58
                            A well fought battle, sir!
                            Who is John Galt?

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                            • DrSchmidt
                              Rear Admiral
                              • Apr 2014
                              • 1014

                              #59
                              The backsides of the four molds is still open, just the sanded filling medium exposed to the open. So the next step is to apply a lid. Basically one takes a coated wood board, next one applies some parting wax, then one laminates the same GRP layers onto the board that were used to make the mold, then one applies a coupling layer of resin mixed with cotton flakes onto the backside of the mold, filling the gaps of the porous filling medium, and than one presses the mold onto the GRP using a plenitude of c-clamps. Done....

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                              • DrSchmidt
                                Rear Admiral
                                • Apr 2014
                                • 1014

                                #60
                                Still finishing the molds. The backsides are laminated and cured, Now I have to cut the protruding GRP and clean the seams. Then the mold is done...

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