[python] Re: pushable/ rideable
- From: Vi Vuong <vi_vuong@xxxxxxxxx>
- To: python@xxxxxxxxxxxxx
- Date: Fri, 25 Mar 2011 19:36:22 -0700 (PDT)
Here is another one push study, http://www.youtube.com/watch?v=o17rHyFmayU
________________________________
From: Pascal Buenzli <pascal.buenzli@xxxxxxxxx>
To: python@xxxxxxxxxxxxx
Sent: Thu, March 24, 2011 11:21:31 PM
Subject: [python] Re: pushable/ rideable
That's a nice one (python_alu1) from a stability analysis perspective. There is
a clear transition (depending on weight distribution on front vs rear
articulated parts) between the tendency of the front wheel to turn left with a
left lean at small weight, but to turn right with a left lean at heavy weight
(which would rather correspond to a real person). Doesn't yet mean it's
unridable, but it surely affects maneuvrability, as "standard bicycles" (e.g.
upright) always exhibit a left turn of the front wheel for a left lean, whether
loaded or not...
Pascal
On Thu, 24 Mar 2011, Vi Vuong wrote:
> Found someone testing weights in a bucket tight to the seat
>http://www.tietoportti.com/Nojapy%C3%B6r%C3%A4.html
>
> Vi
>
>
>
> ________________________________
> From: "dirk@xxxxxxxxxx" <dirk@xxxxxxxxxx>
> To: python@xxxxxxxxxxxxx
> Sent: Mon, March 21, 2011 10:31:58 AM
> Subject: [python] Re: pushable/ rideable
>
>
> Hi *,
>
> i think, too, this is how Juergen mentioned it - a rule of thumb.
> the rideability has the drivers weight inside the equation. If you push the
>bike on its own, its all down to the weight distribution of the bike, plus the
>point where one actually pushes the bike probably atcs as a leaver to bring
>down
>force on the pivot. Folks with higher seats should therefore do better...
>
> greetings,
> DirkS
>
>
>
> "Dirk Bonné" <dirk.bonne@xxxxxxx> hat am 21. März 2011 um 11:30 geschrieben:
>
>> The baby python was very difficult to walk with, but found the handling
>> qualities very good. The pythoon is easy to walk with, and has good
>> handling too. Don't see any connection.
>>
>> Dirk
>>
>> On 18.03.2011 22:33, Jürgen Mages wrote:
>> > Thanks Gerald,
>> >
>> > while pushing my P3, e.g. through a pedestrian zone, I rarely apply
>> > downwards pressure to the back of the seat (which is my handle). It is
>> > more like a smooth sidewards shifting to keep the bike on its track.
>> >
>> > However, of course, this pushable/rideable rule is just a rule of
>> > thumb ...
>> >
>> > Cheers,
>> > Jürgen.
>> >
>> > PS: Any pictures of your specimens available?
>> >
>> >
>> >> Hi Vi, Hi Jürgen, I am not sure about the pushable requirement. Maybe
>> >> a python beeing pushable is an indication that the pivot angle is
>> >> right, but it seems, just that a python is rideable does not
>> >> ensure it is also pushable. I do own two such specimens. Both of
>> >> them ride quite nice and I do so in public traffic.
>> >>
>> >> For a python to be pushable, I think, beside having the pivot angle
>> >> right you need to be able to put sufficient weight on the pivot
>> >> while pushing. If the back of the seat is to far back, you may not
>> >> be able to.
>> >>
>> >>
>> >> Gerald
>> >
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>> >
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>
>
> http://dirk.steuwer.de
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