[python] Re: spring leaf as pivot

On 24.03.2007 10:50, dirk.bonne@xxxxxxx wrote:
As for weight, it should be less than 1kg, and that's for a fail-safe paranoid design. Weight could be shaved off by reducing the thickness of the spring ends, and by greatly reducing the size of the bearings. 
A 110mm bottom bracket + the BB tube weighs in all 460g.. That is not
easy to beat...


Thanks Pierre-Phillipe, a good drawing says more than 1000 words.

I second Dirk concerning the weight. Also I would prefer more
simple solutions, but have no clue how to solve the torsion
issue in a simple way.


A python without a spring or person on it, tends to flop around its
pivot, like a fish that just came out of the water.


That's why mine has a steering stop mechanism while using the stand.
The ability of pushing the bike already says a lot about the
centering/flop ratio.

On 23.03.2007 20:13, Oupa wrote:
> what about the use of motorcycle headsets?
> also the wheel bearings of junked cars should be plentiful and cheap.

Old car wheel bearings (tapered roller) are great. I used them for my
fourth  python (P4). But you need access to a lathe for machining the
housing.

Cheers,
Jürgen.

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