Bonding Carbon fiber motor mounts into a hull

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  • davelc56@gmail.com
    Capt. Dave
    • Oct 2018
    • 28

    #1

    Bonding Carbon fiber motor mounts into a hull

    I can't find info on how to bond CF mounts into a CF hull. I would expect to tack the parts using epoxy, once set, sand and fillet both sides of the entire joint with a epoxy filler mix. Then put a layer of CF cloth over the fillets. The strange thing is I have studied any pictures of similar motor mounts I can find and it looks like there is no layer of cloth used, just bonded in with glue.
    Am I missing something. This is a 41" ZONDA cat hull going 12S crazy.
    Thanks
  • srislash
    Not there yet
    • Mar 2011
    • 7673

    #2
    Originally posted by [email protected]
    I can't find info on how to bond CF mounts into a CF hull. I would expect to tack the parts using epoxy, once set, sand and fillet both sides of the entire joint with a epoxy filler mix. Then put a layer of CF cloth over the fillets. The strange thing is I have studied any pictures of similar motor mounts I can find and it looks like there is no layer of cloth used, just bonded in with glue.
    Am I missing something. This is a 41" ZONDA cat hull going 12S crazy.
    Thanks
    You got it right. That is how my Fantasm/Zonda is done. BTW, also 12s x 2 TP 4050’s

    Comment

    • Nevs
      Sven
      • Sep 2011
      • 164

      #3
      Í think the english word is joint glue. I made a test last year with different types types. wood /carbon, and carbon/carbon. All the joint glues were stronger then any epoxy.

      When using epoxy the WIKO 05 is better then anything else I tryed..But its a 5 min. epox. Maybe they make one that hardens less fast.

      Comment

      • davelc56@gmail.com
        Capt. Dave
        • Oct 2018
        • 28

        #4
        Can anyone recommend what glue or epoxy? I have west systems epoxy in stock. (In Canada.)

        Comment

        • srislash
          Not there yet
          • Mar 2011
          • 7673

          #5
          Originally posted by [email protected]
          Can anyone recommend what glue or epoxy? I have west systems epoxy in stock. (In Canada.)
          I use System Three laminating resin. I can’t remember the West System that everyone uses. The resin used on the hull will be different but we’ve had no issues bonding to it.

          Comment

          • martin
            Fast Electric Addict!
            • Aug 2010
            • 2887

            #6
            A lot use JB Weld original for bonding mounts etc with great success.

            Comment

            • Luck as a Constant
              Make Total Destroy
              • Mar 2014
              • 1952

              #7
              west systems is great. in particular their G Flex line for bonding stuff. or the 105 is great too
              There's a hole at the center of earth where the rest of the world sinks but i stand still...

              Comment

              • photohoward1
                Fast Electric Addict!
                • Mar 2009
                • 1610

                #8
                Marine adhesive 5200 is great too. Never coming out. It bonds everything.


                Sent from my iPhone using Tapatalk

                Comment

                • davelc56@gmail.com
                  Capt. Dave
                  • Oct 2018
                  • 28

                  #9
                  Thanks Gentlemen!

                  Comment

                  • 30nitro
                    Senior Member
                    • Feb 2018
                    • 330

                    #10
                    I second the 5200 marine adhesive..!!

                    Comment

                    • snehpetsffej
                      Member
                      • Jan 2012
                      • 30

                      #11
                      z poxy this has held my motors in for years with a lot of abuse
                      https://www.amazon.com/Pacer-Technol...s=z+poxy&psc=1

                      Comment

                      • kfxguy
                        Fast Electric Addict!
                        • Oct 2013
                        • 8746

                        #12
                        I'm very picky with my builds. I use jb weld and use a heat gun on low heat to help it flow and smooth out. Then if i want it black, i scuff up the jb weld and go over it with 5 minute clear epoxy, tinted gloss black (or whatever color i choose).
                        32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) was

                        Comment

                        • kfxguy
                          Fast Electric Addict!
                          • Oct 2013
                          • 8746

                          #13
                          Bare jb weld




                          After coloring




                          32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) was

                          Comment

                          • 30nitro
                            Senior Member
                            • Feb 2018
                            • 330

                            #14
                            How does the JB weld hold up on motor mounts..? I've only used it on sponson water pick ups...

                            Comment

                            • kfxguy
                              Fast Electric Addict!
                              • Oct 2013
                              • 8746

                              #15
                              Originally posted by 30nitro
                              How does the JB weld hold up on motor mounts..? I've only used it on sponson water pick ups...
                              I’ve flipped boats at 90+ and it holds up. I flipped one boat at 100mph but the crash was 1 in 1000 and the way the boat came to an instant stop, it broke all kinds of stuff including the motor mount lose. But. Had the mount not let got it would have ripped a hole in the hull. I use jb weld every time. In my opinion it’s the best choice.
                              32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) was

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