[python] Re: lean steer trike

>So for the python, turning the angle of the pivot farther back to
>be more like the flevo-bike would be a BAD IDEA (even if the cranks
>could be kept at the same height)?  (I just want this to be clear).

Indeed. I tried this with a prototype one year ago. The turning
cycle was inacceptably large (10m). Just keep the angle around
80 degrees.

>
>Also, at what point in raising the seat height would it pass
>from requiring negative trail for stability to being unstable with
>negative trail?

That is a good question and it goes deep into frame geometry.
The stability is not only a matter of seat height and trail but also
of the rake. So you have 3 variables.

The pendulum does only work, if the seat is raised, when the
front wheel turns. E.g. my python raises about 3 cm when I
turn the FW 20 degrees.

Hope it was understandable,

Jürgen.

In German: Es geht gerade um Rahmengeometrie. Ich behaupte,
dass das python nur wegen dem Pendelprinzip stabil ist. Das
airbike / flevobike wäre mit negativem Nachlauf nicht stabil.
Beim python hebt sich der Sitz bei einem Lenkeinschlag von
20 Grad um etwa 3 cm an, deshalb pendelt das VRad automatisch
in die Mitte zurück, weil der Schwerpunkt so am niedrigsten ist.

Schöne Feiertage an Alle.



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