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adding a 3rd pontoon log to 2 log boat

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  • adding a 3rd pontoon log to 2 log boat

    I have a 24' pontoon boat with 19" logs on it now. I found a 18' log with a diameter of 23" that I want to add to down the middle. I know about leaving enough space between back end of new toon and the transom so the motor won't cavitate. And I know about keeping it even or ahead of the existing toons, but what about the diameter difference? Will the larger log cause the boat to teter back and forth, side to side? Or will the shorter length be less boyant than the longer toons, thus not causing this problem? Thanks so much for your help with this, Dave


  • #2
    Re: adding a 3rd pontoon log to 2 log boat

    I'm gonna guess it would be a problem. It might not teeter, but I think the middle log would always be so deep in the water that it would slow you down a lot. If the middle log floated the middle more than the outer logs float the sides, it would create some bad stress too. I don't know much about it, but those are the problems that come to mind for me.

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    • #3
      Re: adding a 3rd pontoon log to 2 log boat

      Thanks for the reply hayhauler. I actually thought it might help being deeper in the water from the standpoint of a typical runabout Deep Vee haul design? I figured that it may help getting the old girl up on top of the water with enough H.P. ? I may try and get hold of a manufacturer of pontoon boats to se what their engineers say. Thanks again for the input. Definately something to consider.

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      • #4
        Re: adding a 3rd pontoon log to 2 log boat

        In regard to the different diameters - you could always lower the outside toons so that all three are bottom level.Aldo
        Watch this space......................

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        • #5
          Re: adding a 3rd pontoon log to 2 log boat

          That might work also. I will have to look into that as another option. thanks so much, Dave

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          • #6
            Re: adding a 3rd pontoon log to 2 log boat

            Aldo, it’s not about having the pontoons at the same depth; it’s about the volume of water each will displace. Obviously a larger diameter pontoon will displace more water than a smaller diameter pontoon at the same depth. Instead of lowing the smaller pontoons, you would raise the larger one up and out some...I think.I say don’t put the 3rd ‘toon on the boat. Instead, cut a couple holes in the top (one for you and one for the Mrs.), grab a couple kayak paddles and head on out. Oh, and if it’s an aluminum ‘toon you may need some sunglasses.

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            • #7
              Re: adding a 3rd pontoon log to 2 log boat

              Originally posted by 18rabbit: Aldo, it’s not about having the pontoons at the same depth; it’s about the volume of water each will displace. Obviously a larger diameter pontoon will displace more water than a smaller diameter pontoon at the same depth. Instead of lowing the smaller pontoons, you would raise the larger one up and out some...I think.
              Agreed but most pontoon boat have the toons already hard up to (or close) to the frame - I doubt if its possible to mount the centre toon higher than the outside toons - therfore lower the outside toons brings us to the same destination - sort of. I still believe that the centre toon will cause to much turbulence and it will affect the motor.Aldo
              Watch this space......................

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              • #8
                Re: adding a 3rd pontoon log to 2 log boat

                Did exactly what you are thinking about to my boat. Worked out great, my center log is about 12" ahead of the outside logs not that it will make any differance. I have seen them ahead, even and behind(tracker). Just make sure you can get it on and off your trailer...

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                • #9
                  Re: adding a 3rd pontoon log to 2 log boat

                  Purely out of curiosity....why would a 3rd log be favorable to add?
                  '86 SeaRay Seville 195BR c/w Mercruiser 170
                  '72 Glastron GT160 & 1985 Merc 150HP V6 Outboard
                  Project Status: http://forums.iboats.com/forum/boat-...lastron-gt160
                  The Merc Nut

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                  • #10
                    Re: adding a 3rd pontoon log to 2 log boat

                    Originally posted by AMD Rules: Purely out of curiosity....why would a 3rd log be favorable to add?
                    Increase bouyancy (decrease displacement) - lift the boat further out of the water. Cheaper than replacing existing toons with larger ones.Aldo
                    Watch this space......................

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                    • #11
                      Re: adding a 3rd pontoon log to 2 log boat

                      The older pontoons with smaller diamiter logs tend to nose dive when you back out of the throttle, gets worse when everyone is up front. Third log helps keep the bow up.

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                      • #12
                        Re: adding a 3rd pontoon log to 2 log boat

                        Hey River Rat, can you pass along your phone number so I can call you. directly. I would like to talk more in depth with you about this. Thanks so much, Dave For all others interested in doing something similar, I talked with Harris Boats today. ( my boat is a Harris Float Boat )The fellow there thought it would work out great, even with the size difference. Think I'll bolt it up and see what happens. At least I know it won't sink. Thanks for all of your help, Dave

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                        • #13
                          Re: adding a 3rd pontoon log to 2 log boat

                          djwalters, e-mail me at cjohnsoniii@austin.rr.com

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