[python] Re: leave out tubes

juermaier@xxxxxx wrote:
> 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.

I think I'll try that too - the silent block is in the way for the obvious
steering mount on my bike ;-)

>> 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.

Interesting. I think you will need adjustment possibilities for the wire,
but apart from that - wires are not nice to meet during a fall. And they do
flex, so I don't think they will work in a racebike, but maybe they could
make the suspension obsolete on a commuter.

>> 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.

Thank's :-) My preferred tubing would be square or oval CroMo. Oh CroMo
30*10*.8 where _are_ you?

>  >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'm dreaming of a carbon "front wheel fairing" to enclose the upper part
completely. I think aero is as important as weight on a racer. Maybe I'll
put wheeldisks on too, but they could cause problems in sidewinds. You are
very right about the mudguard theory - I went for a 8km ride on bikepaths
yesterday - mostly tar and stone surface, but some gravel and mud *yuk* too
:-) I took a spill in the mud - must have looked funny : me standing belly
up on feets and hands, and the bike casually on the side below me :-) I only
cut my arm a little bit..

Regards,
Torben


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