MHZ Mystic 114 - my first proper build

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  • TiTu
    Junior Member
    • Apr 2011
    • 23

    #46
    Wait is over, got the lipo treys and decals from Kent. I couldn't be more happy with them, their quality is just outstanding!

    Now a big question before I glue everything in the hull: Where should I aim my center of gravity?
    I've had the idea of that cog should be at 32-34% from the sponson transom, but I recall seeing someone writing not long ago that the cat ran fine with cog closer to 40%, just can't find the post anymore.

    Due to the motor placement (so that my lipo packs still fit into the hull) I have about 4% play in the cog which isn't as much as I'd like to have. That's why I'd love to get the cog nailed pretty much on place (a bit hard when I can't run the boat ) so that I wouldn't need to use extra weight to sort it out later as with most of the bits and pieces she weights about 6kg already.

    So please chime in your opinions and experiences about the proper cog!

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    • nata2run
      customcfparts.com
      • Nov 2011
      • 1837

      #47
      Maybe pack with some foam and run before you glue anything in?
      Visit www.customcfparts.com | Custom Boat Building | Custom Carbon Fiber Parts | Custom Graphics | LMT Premium Dealer | MGM Premium Dealer | YouTube | Facebook
      "Follow someone's footsteps and you will always be a step behind"

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      • nata2run
        customcfparts.com
        • Nov 2011
        • 1837

        #48
        Happy you like the parts, my pleasure :-)
        Visit www.customcfparts.com | Custom Boat Building | Custom Carbon Fiber Parts | Custom Graphics | LMT Premium Dealer | MGM Premium Dealer | YouTube | Facebook
        "Follow someone's footsteps and you will always be a step behind"

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        • TiTu
          Junior Member
          • Apr 2011
          • 23

          #49
          Time to update this thread because too much time has passed since the last time.

          Lipo slide system that Kent provided, couldn't be more happy with those, they work like a charm.
          Lipo trays.jpg

          I was able to run her only once last summer with a hurry. It was far from perfect, full throtle speed was very slow. I came up with three possible explanations: lvc set too high, excessive negative angle on the drives and faulty tx/rx(I was losing signal time to time).

          During winter, I did some work to address the excessive negative angle.
          Fixed drives01.jpg Fixed drives02.jpg
          By embedding the drive supports to the hull I was able to get the drives to neutral position. Besides the work with the drives, I reduced the lvc threshold and changed tx/rx.

          Few images from interior:
          Overview01.jpg Overview02.jpg

          The second run was total opposite to the maiden. No tx/rx problems and she even had gotten more speed. The only issue was that I was getting a bit grease and water inside the hull through one of the drives so need to address that next.
          A vid from that second run:
          Second test with the untrimmed MHZ Mystic 114 Motors: 2x Leopard 4082 1600kv Escs: 2x SeaKing 180 Props: Octura x442 L/R Lipos: Nano Tech 5000mah 45c 6s1p per side


          Sorry for a short vid, but you didn't miss much as I flipped her over soon after my wife stopped recording
          Lipos, esc's and motors were barely warm so might try bigger props next.
          Will x447 be ok or are there a more suitable props in the propshop's selection? Props are something that I don't know much so I'd be happy for suggestions!
          Moreover I might consider getting 4082 2000kv leos, but I need to find out if I'm able to use these motors in my next build (I know, this one is far from ready, at least with the limited time I have atm lol).

          Comment

          • nata2run
            customcfparts.com
            • Nov 2011
            • 1837

            #50
            Looks nice! Seems like you have some adjustment options with the lipos. At more speed you may have to move them forward a little, but it looks like they are in a good spot. I had the same setup in mine but with 448 props, and speeds in the high 70's. The 442 props call for a bit more rpm if you want greater speed, but for testing it's perfect. I'm glad you like the lipo system, should be awesome once painted...
            Visit www.customcfparts.com | Custom Boat Building | Custom Carbon Fiber Parts | Custom Graphics | LMT Premium Dealer | MGM Premium Dealer | YouTube | Facebook
            "Follow someone's footsteps and you will always be a step behind"

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            • heraldoboldrin
              Junior Member
              • Dec 2011
              • 10

              #51
              I have a 41" carbon Fantasm with twin TP Power Pro Competition Series 4050, 6S and 448 props
              But i cant get 100km/h
              I am thinking upgrade it to leopards 4092 1730kv, or 4082 2000kv or 4082 2200kv the get more speedy.
              what you guys say about?
              I also whant to change the stinger.. what you recommended?IMAG1524.jpgIMAG1525.jpgIMAG1526.jpg

              Comment

              • dmitry100
                Fast Electric Addict!
                • Mar 2015
                • 1264

                #52
                You should start testing some bigger props man. You have alot of powerful hardware (torquey motors for that matter) that could take you alot faster with the right prop. :)

                Those CF motor mounts look great. How did you use to make them?

                Comment

                • TiTu
                  Junior Member
                  • Apr 2011
                  • 23

                  #53
                  Almost finished

                  Reviving an old thread, but I wanted to take this project to finish. After years of delays, got the hull painted, applied decals and clear varnished and man, couldn't be happier. This is how she looks at the moment:

                  01.jpg

                  02.jpg

                  Big thanks to Kent for decals! Those thin line decals around hatches make a difference imo.

                  Can't wait to install all the hardware.

                  Comment

                  • fweasel
                    master of some
                    • Jul 2016
                    • 4279

                    #54
                    Wow, that's an old thread. Paint job and details look really good!
                    Vac-U-Tug Jr (13mph)

                    Comment

                    • drwayne
                      Fast Electric Addict!
                      • May 2008
                      • 2981

                      #55
                      Good effort.
                      I'm now 5 years into a hull that's still a year away from finish.
                      Or 2..
                      Lol good to see it shine !!
                      Wayne Schutte PhdCSE BaSE BaEE. Australian, & damn proud of it YOUTUBE
                      @ 36" H&M Maritmo twin1512/1800 6S1P 88mph @ 40" drag hydro#1 twin 5692 12S1P .....always for fun @

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