Hi Dirk,
Yes, the rear pivot is somewhat
redundant in terms of steering, and auxiliary at most (only during turns). However, it's
primary purpose is to enable 2 folds for compactness, yet
without any folding locking mechanism and seat removal like
the commercial Grasshopper or Cobra or the μPython. I was
prepared to make a pivot lock in case it's not ridable, but
after some testing, it seems that I can skip the lock and
consider the extra instability as a compromise / feature.
Over the next few months, I will be comparing its mobility
/ utilization vs. the μPython, going
different places. The μPython will
probably win the popularity contest, with the tiny
motorcycle tires alone.
There is a steering linkage
between the wheels, an organic one (the rider). I was
surprised that the weight of my back is able to keep rear
pivot / wheel pretty steady going straight without any
correction effort, not much different than regular python.
Some coroplast friction between the backrest and seat
bottom helps, at least walking the bike. Turning is more
different, almost a new experience, very smooth like butter
and without moving the shoulder outward. Perhaps, this is
its best riding characteristic, which I would recommend
people to try.
