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  • #46
    NNC Seat base

    Hi All, just a brief description of how I do the NNC bases.

    I made the plug from extruded polystyrene as it is easy to shape and you can get a good finish on it sanding wet. I looked at the possibility of flattening a plastic base but the shape is too complex to expect a usable plug.

    I then made a mould from the plug, this was an internal mould, to make the base I needed an external mould so I laid up a new mould, from the first mould that was exactly the same shape as the polystyrene plug (I hope this makes some sense).

    To make a base, the mould is waxed then mould release is applied, once dry I cut out the carbon shapes, so far I have been using 10 layers of 200 gram twill carbon with doublers around the post mount.

    Steps for the lay up are, wet out the mould with epoxy using a 50mm paint roller, then lay a piece of carbon, roll on more epoxy, another layer of carbon etc until all the pieces are applied.

    Then the mould is covered with bleeder cloth and an absorption material (I use paper towels, there always seems to be some in the kitchen ) then it goes into a vacuum bag which compresses the lay up and bleeds out the excess resign, that's why it weighs 120 grams.

    I could post a heap of photos but I can't work out how to do that, or Gizmo Duck could put them up?

    I have had a fair bit of experience with glass, carbon and Kevlar and for this carbon is going to achieve the best strength and stiffness to weight ratio, also the most expensive.

    Cheers.
    Once you ride flat, there's no going back!

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    • #47
      [ATTACH]55338[/ATTACH]

      [ATTACH]55339[/ATTACH]
      Once you ride flat, there's no going back!

      Comment


      • #48
        Hi Pete

        Would you consider making stronger bases for muni and selling one?

        Sam

        Comment


        • #49
          [ATTACH]55340[/ATTACH]

          [ATTACH]55341[/ATTACH]

          Here's the plug.
          Once you ride flat, there's no going back!

          Comment


          • #50
            [ATTACH]55342[/ATTACH]

            Finished mould prior to polishing.

            [ATTACH]55343[/ATTACH]

            both moulds

            [ATTACH]55344[/ATTACH]

            [ATTACH]55345[/ATTACH]

            [ATTACH]55346[/ATTACH]

            [ATTACH]55347[/ATTACH]

            In the Vac bag

            [ATTACH]55348[/ATTACH]

            This the base still on the mould after removing the bleed cloth etc.

            [ATTACH]55349[/ATTACH]

            For this one I used a UDC Club saddle for the foam and hardware, it is heaps more comfy than a curved saddle
            Once you ride flat, there's no going back!

            Comment


            • #51
              I was thinking of trying one for MUNI, not sure if it would be suitable, I can make one for you to try but we are currently packing up to move house so it woul'dn't be for a month or so.
              Once you ride flat, there's no going back!

              Comment


              • #52
                Originally posted by Pete NNC View Post
                I was thinking of trying one for MUNI, not sure if it would be suitable, I can make one for you to try but we are currently packing up to move house so it woul'dn't be for a month or so.
                Not suitable because of the light construction or too flat?

                So are your seats much more comfy than say KH freeride? I was just curious if you would sell a beefed up carbon fibre base made stronger for muni- I don't know if I would buy one Say if you were to make a stronger base for muni how much would you charge?
                Last edited by OutdoorJunkie; 2012-09-25, 07:07 AM.

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                • #53
                  This raises the question of why, if flat bases are so much more comfortable, why has every single manufactured saddle to date had so much curvature?

                  Incidently, thanks to all those who are experimenting with these kinds of things- seat discomfort is the bane of unicycling and if this results in a saddle that reduces or removes that, then that would be brilliant.
                  "You can't outrun Death forever.
                  But you can make the Bastard work for it."

                  --MAJOR KORGO KORGAR,
                  "Last of The Lancers"
                  AFC 32

                  Comment


                  • #54
                    if someone needs a test person for a flat muni saddle, I'm right here!

                    I've tried a bike saddle for muni with a "stick" from the seatpost to hold on, it worked pretty well, but in the front the saddle was to narrow, hard to control...
                    If everything's under control, you're going too slow

                    I trust in those:

                    Triton

                    Mountainuni Brake System

                    Schlumpf

                    Comment


                    • #55
                      Originally posted by onewheeldave View Post
                      This raises the question of why, if flat bases are so much more comfortable, why has every single manufactured saddle to date had so much curvature?
                      I have a horrible feeling that's because "that's the way it's always been".
                      Unicycling: great for your thighs.

                      Comment


                      • #56
                        Pete- thanks for contributing to this thread! You did an amazing job of the carbon base- I'm loving mine. For those people who are wondering why it's called the NNC seat, it stands for 'No Nut Crush'

                        Originally posted by onewheeldave View Post
                        This raises the question of why, if flat bases are so much more comfortable, why has every single manufactured saddle to date had so much curvature?
                        My theory is that there was a slight curve in early saddles because they did not have adequate handles. Also many freestyle riders ride hands free for tricks, which means the need to be wedged into the seat for crotch control. They also didn't spend hours on the saddle at one stretch, until long distance unicycling started becoming popular.

                        Seat bases became more curved when the KH seats came out, because they use more or less the same plastic molds, and the molds are expensive to make.

                        Originally posted by aracer View Post
                        I have a horrible feeling that's because "that's the way it's always been".
                        As mentioned, Miyata seats were popular about 10yrs ago, and has a slight curve, but nothing compared to the 45 degree bend of todays seat bases. I still like Miyata seats, apart from the handle.

                        Originally posted by OutdoorJunkie View Post
                        Not suitable because of the light construction or too flat?

                        So are your seats much more comfy than say KH freeride? I was just curious if you would sell a beefed up carbon fibre base made stronger for muni- I don't know if I would buy one Say if you were to make a stronger base for muni how much would you charge?
                        I'm intending to use mine for XC MUni, and I have been wanting a flat MUni seat for years. We haven't tested the extremes of pulling and pushing forces yet, so not sure if it more carbon layers are required or if Petes 10 layer base is strong enough. It probably will be for me, but I weigh less than 60kg.

                        Originally posted by Gilby View Post
                        But using "squishy bits" is just fine:
                        Sshhh...you'll ruin my reputation
                        Last edited by GizmoDuck; 2012-09-25, 03:41 PM.
                        Adventure Unicyclist

                        Alps 2 Ocean


                        Unistan: The Uzbekistan Unicycle Tour

                        Induni: The India Unicycle Tour

                        Monguni: The Mongolia Unicycle Tour

                        Comment


                        • #57
                          I have done a lot of different saddle testing and modifications. I agree that most saddles is to much curved. I also made a nearly completely flat saddle. But that didn't work for me. Here is some thing I have found out:

                          * The riding position has more to say than the width of your sit bones. If you ride a upright position (some does - like Chuck Edwall) you can ride width a wider saddle.

                          * I have much less control on a narrow saddle. For me i noticed that i got problems when doing long rides. (Over 60km - 36").

                          * I have much less control on a flat saddle. For me i noticed that i got problems when doing long rides. (Over 60km - 36").

                          * I need a softer saddle when riding Muni and gravel roads. The saddle must have some suspension, but not be a spring.

                          You may have 1000 bicycles saddles to chose from. And they are made in all styles. There are not many unicycle saddles to chose from. I think there are place for a couple more :-)

                          The result from my unicycle testing, finally, was that I changed the saddle on my bicycle (mtb) from a flat and narrow (Selle Italia SLR) to a curved wider (Fizik Aliante)!!!
                          www.unijuul.com

                          Comment


                          • #58
                            Originally posted by unijuul View Post

                            * I have much less control on a narrow saddle. For me i noticed that i got problems when doing long rides. (Over 60km - 36").
                            But what about rides under 60km? Did you suffer from lack of control, and, over those shorter distances, was the saddle more comfortable?
                            "You can't outrun Death forever.
                            But you can make the Bastard work for it."

                            --MAJOR KORGO KORGAR,
                            "Last of The Lancers"
                            AFC 32

                            Comment


                            • #59
                              You may have 1000 bicycles saddles to chose from. And they are made in all styles. There are not many unicycle saddles to chose from. I think there are place for a couple more :-)
                              I agree, there is room for a saddle that is not molded on the same base as all the others, esp one that seems to crush the jewels.

                              I have played around with foam cutting, mocked up a KH base with minicell foam trying to get a flatter and more comfortable seat. What I found was that the KH "dual denisty" Freeride foam is really tough to beat for comfort. So if it were to be combined with a flatter seat profile, that could be nice.

                              I'd buy a flattened carbon fiber base built to muni specs.
                              I dream of hamsters and elderberries

                              Comment


                              • #60
                                Originally posted by onewheeldave View Post
                                But what about rides under 60km? Did you suffer from lack of control, and, over those shorter distances, was the saddle more comfortable?
                                The saddle was comfortable. But I was using more energy to keep the balance. After a while I was cycling on one and one side of the saddle. It was difficoult to sit right on the saddle. I was testing it on tarmac ungeared with 110 mm cranks. I found out that it was better to have some shafting on the thighs rather than suffer from control.
                                www.unijuul.com

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