Trim Issues

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  • biggsgolf
    Captain
    • Jan 2020
    • 762

    Trim Issues

    1:96 Scale Skipjack, surface trim good, submerged trim good, however, as I turn or slow down the bow rises causing the sail to to surface, and the boat is no longer level, (bow higher then stern). Using the R&R cylinder and 2.4 Ghz antenna inside a mast above water in submerged trim. Any ideas?
  • biggsgolf
    Captain
    • Jan 2020
    • 762

    #2
    (Fixed Sail Planes, operational Dive Planes)

    Comment

    • Subculture
      Admiral
      • Feb 2009
      • 2169

      #3
      If you're saying that the static trim changes, then there may be some trapped air in the hull. Dynamic changes are another matter, and it's common for a boat to lift its snout on a turn.

      Comment

      • He Who Shall Not Be Named
        Moderator
        • Aug 2008
        • 12508

        #4
        Originally posted by Subculture
        If you're saying that the static trim changes, then there may be some trapped air in the hull. Dynamic changes are another matter, and it's common for a boat to lift its snout on a turn.
        Yeah. What Andy said. You're chasing an internal bubble. Do a better job of venting the hull back aft. Opening up the ballast tank main vent valve positions of the kit is an ideal 'scale' method of ventilating the hull back there.

        Who is John Galt?

        Comment

        • biggsgolf
          Captain
          • Jan 2020
          • 762

          #5
          Thanks guys! Will do for next run

          Comment

          • redboat219
            Admiral
            • Dec 2008
            • 2885

            #6
            Click image for larger version  Name:	134863A5-D5FD-4AE6-A117-1A4D37DA212D.jpg Views:	0 Size:	94.8 KB ID:	180454 This bulkhead may be trapping air.

            I have finished printing The Skipjack. I printed in 1:96 to accomodate my 2.5” Subdriver. I am now installing the mechanics. The Tail assembly is not yet attached as Drive shaft and Control Rods are being routed. 402AC274-6BD3-4940-9A50-296899BFAAC2.jpegDCFE51F7-6BA9-400C-B3B0-A0C99995CB92.jpeg164B7822-C31F-4EDA-9BE2
            Last edited by redboat219; 05-31-2024, 10:04 AM.
            Make it simple, make strong, make it work!

            Comment

            • biggsgolf
              Captain
              • Jan 2020
              • 762

              #7
              Originally posted by redboat219
              Click image for larger version Name:	134863A5-D5FD-4AE6-A117-1A4D37DA212D.jpg Views:	0 Size:	94.8 KB ID:	180454 This bulkhead may be trapping air.

              https://forum.rc-sub.com/forum/build...tilus-drydocks
              Agreed, I previously tried to vent it better, will be looking at it again.

              Comment

              • Thorbrandr
                Lieutenant Commander
                • Mar 2022
                • 133

                #8
                Taking care of trapped air is always good.

                As stated above, boats will tend to rise in turns.

                My R10, with the raised bulbous bow, and low mounted rudders does this, and even my 212 with the X tail.

                Comment

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