The drivetrain on the Shamancycle has gone through some engineering improvements. Here is what it originally looked like.
Note that the chain on the right in this view puts the tension of the chain directly onto the pulley, and that isn’t good for the long run. John came up with a far better method. Thanks for not only the idea, but for taking it on and building the components, and to Sharon for the assist as well. He developed a vertical post with an adjustable shaft attachment. Unlike the Kosmic Dust Pedal Pub, the Shamancycle doesn’t have a cross member above the chains to attach anything to.
On the other side, the figure eight chains had some problems as well. One chain was made from chains that were wider than the others, which complicated the passing of the chains as it was resisting the sideways movement needed. I changed it to a different chain.
Liam has seen other figure eight chains use a PVC pipe to allow the chains to not hang up on each other. I visited ReStore (love that place, it’s like my garage, but larger!) to obtain some PVC and other stuff. I obtained some T’s and a length of metal pipe and ended up with this arrangement. This allowed the pulleys to not have to make such a large transition.
Together these two changes to the drivetrain have made a great improvement and they seem much more solid and reliable. Time to make a test run!
For the next test run, we need to fill up the seats. It’s difficult to pedal and steer at the same time. (Jeff)