[python] leave out tubes

Hi Dirk,

Dirk Bonne wrote:
>Could that not be a good reason to use a (weak) silent blok anyway?
>Just to be able to take the python by the seat and walk.

I want to attach two pieces of rubber rope between front and rear part
to be able to push the python comfortably, maybe demontable if they
are not good for steering.

>Uhm, which two tubes do you mean. There are tubes all over your
bike ;-)

You can see on the attached drawing. I want to use instead a 2,5 mm
steel rope for the pulling forces.

>Do you think it would also have worked only using 3 tubes running
>into the pivot? Thus at the rear hub, start out with four tubes. Connect
>the lower two tubes just after the wheel and continue in the middle to
>the pivot. All triangles are still there, but the lower part is weaker

It would work but you will gain approximatly only 0,10 kg weight, the
stiffness is worse and it is more work to weld.

Anyway my frame needs more work to weld compared to Torbens one.
All these little round tubes. I like Torbens design very much. And to
have those corner-tubes in 1 mm wall thickness would be great, but I
could not found them.

 >but still: it is not fair ;-).
>...It must be possible to go lighter with using these smart thin tubes.

I am dreaming of a 10 kg python. with p2 I used a trekking bike for
pivot and front BB part. The pivot is heavy and the BB part also. For p3
I will use a racing bike, a brass pivot, racing wheels and brakes. I am
curious how much this will reduce weight. p3 will have all tubes of 12 x
1 mm tubes and mudguards. Without mudguards the dust of the street
is throwed on the body and face, what I don't like at all. Imagine riding
through the rain without mudguards, I would look like an army soldier
after war.

>I believe I understand, you want to remove the seat plate?

Yes.

Jürgen from Giebelstadt

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