[python] AW: Re: AW: AW: Re: Twist-Python
- From: Gerald<bepb@xxxxxx>
- To: python@xxxxxxxxxxxxx
- Date: Sun, 24 Jun 2012 08:44:43 +0200
Hi Dirk,
You are right, it is the frontpart off the pivot which is compressed. Seems I
was somehow confused. Maybe I better not write about bike geomety after
midnight.
Gerald
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Von: "dirk@xxxxxxxxxx" <dirk@xxxxxxxxxx>
An: python@xxxxxxxxxxxxx
Gesendet: Donnerstag, 21. Juni 2012 16:05:31 GMT+00:00
Betreff: [python] Re: AW: AW: Re: Twist-Python
Hi Gerald,
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i actually think, it should be the front part, that recieves pressure while the
rod in the middle is being pulled out - at least if the rider is sitting.
Given a very high pedal position, high pedalling force with low rider weight and
the rider leaning with the upper part of his back against the seat could
reverse the situation in theory, but then, the inverse pendulum effect should be
reversed as well, since you are pulling up the bottom bracket.
regards,
DirkS
Gerald <bepb@xxxxxx> hat am 20. Juni 2012 um 00:23 geschrieben:
> Hi,
> sorry, I think I have to correct myself. Obviously, its rather the rear part
> off the disk that is beeing pressed together by the weight off the rider.
>
> Gerald
>
> -----Ursprüngliche Nachricht-----
> Von: Gerald <bepb@xxxxxx>
> An: python@xxxxxxxxxxxxx
> Gesendet: Dienstag, 19. Juni 2012 20:40:17 GMT+00:00
> Betreff: [python] AW: Re: Twist-Python
>
> Hi,
> first off all, I too, like the flat construction off the pivot. This will
> allow for a even lower seat position.
> If I am not much misstaken, only the frontend off the disks will be pressed
> together due to the load on the pivot.
> One or two coaster blocks - I hope the term is right - on or in stead off one
> off the disks might even improve the pivot.
>
> BR Gerald
>
> -----Ursprüngliche Nachricht-----
> Von: "dirk@xxxxxxxxxx" <dirk@xxxxxxxxxx>
> An: python@xxxxxxxxxxxxx
> Gesendet: Montag, 18. Juni 2012 12:22:28 GMT+00:00
> Betreff: [python] Re: Twist-Python
>
> Hi,
>
> i suspect a lot of friction/wear, especially on the outer end of the discs,
> since they travel a lot when turning. However, this might turn out as a wanted
> damping effect, potentially reducing psi...
>
> I think, there are bearings available, that have a similar diameter to these
> discs, but aren't prone to friction.
>
> greetings,
> DirkS
>
>
> "Jürgen Mages" <jmages@xxxxxx> hat am 16. Juni 2012 um 07:53 geschrieben:
>
> > I also have thought of such seat swivel bases some years ago, but
> > abandoned the idea: The central bolt seemed too weak and I was too lazy
> > to enforce it. The ukranian version might last without too much wear.
> > Time will proof if it works ... anyway it's a very smart idea.
> >
> > Jürgen.
> >
> > On 16.06.2012 05:26, Vi Vuong wrote:
> > > Having to use head tube for pivot exclusively so far, I can
> > > appreciate the compactness of the disk. Pivot placement seems
> > > conveniently good for minimum PSI. I am wondering if a seat swivel
> > > base can be used as a disk pivot, relatively inexpensive but maybe a
> > > bit heavier...
> > > https://www.google.com/search?q=Boat+Seat+Swivel&tbm=isch
> > >
> > > Vi
> > >
> > >
> > >
> > >
> > >> ________________________________ From: Jürgen Mages <jmages@xxxxxx>
> > >> To: Python Mailinglist <python@xxxxxxxxxxxxx> Sent: Friday, June
> > >> 15, 2012 5:41 PM Subject: [python] Twist-Python
> > >>
> > >> Hello folks,
> > >>
> > >> some inventive stuff from Ukraine:
> > >>
> > >> http://hpv.com.ua/2012/04/twist-%D1%81-%D0%BF%D0%BE%D0%B4%D1%80%D0%BE%D0%B1%D0%BD%D0%BE%D1%81%D1%82%D1%8F%D0%BC%D0%B8-2/
> > >> http://hpv.com.ua/2012/04/twist-python/
> > >>
> > >> that disk-pivot is definitely new to me!
> > >>
> > >> Cheers, Jürgen.
> >
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