[python] Re: python Digest V11 #45
- From: Paul Cartwright <paulcartwrightx@xxxxxxxxx>
- To: python@xxxxxxxxxxxxx
- Date: Fri, 6 Sep 2013 21:44:35 -0400
Erik,
I attached the entire seat to the front half of my bike, and the handlebars
to the rear half. I kept the rest of the geometry unchanged. So, it is
actually a rear-steered bike, and you have to turn the handlebars left to
make a right turn. This is something of a mind-bender, but after a while I
could ride it. I think if one rode it a lot, it would be just as easy as
the conventional arrangement.
The pivot of this bike is directly under the seat. But one's upper body is
aft of the pivot, so that when you make a turn with the rear steering
configuration, that weight shifts to the side away from the turn. This
takes some getting used to, and its harder to make tight turns. Maybe your
split seat would solve this . . .
On Fri, Sep 6, 2013 at 5:01 PM, Howard Stevens <hstevens94@xxxxxxxxx> wrote:
> Hi Erik,
> Just a few more cents worth. I have experimented with your idea and found
> the feeling of the tilting seat base rather disconcerting as it gives a
> feel of falling out on the road when you do a sharp turn. It also changes
> the geometry because the pivot will be further back and actually the bike
> becomes a rear wheel steering configuration which most have found counter
> intuitive and considerably less stable. It is an excellent idea but seems
> not to work in practice. However there was one rear steering trike I saw
> on you tube that seemed to work fine......can't remeber the details
> ...sorry!
> Good luck Howard Stevens
>
>
> On Fri, Sep 6, 2013 at 3:06 PM, FreeLists Mailing List Manager <
> ecartis@xxxxxxxxxxxxx> wrote:
>
>> python Digest Thu, 05 Sep 2013 Volume: 11 Issue: 045
>>
>> In This Issue:
>> [python] Flexible / parted seat
>> [python] Re: Flexible / parted seat
>>
>> ----------------------------------------------------------------------
>>
>> Date: Thu, 5 Sep 2013 16:04:43 +0200
>> Subject: [python] Flexible / parted seat
>> From: Erik Wassermann <erik.wassermann@xxxxxxxxx>
>>
>> Hi Everyone,
>>
>> after finishing my first python and driving the first 50-60km I´m
>> still not really satisfied with my seat.
>> I use a diy plywood/ rib seat like some others too. When cruising
>> around I often have problems to hold the upper part of my back down to
>> the seat and the ride becomes really unstable. I have the impression
>> that the whole tilting and twisting of my butt and lower back on the
>> rigid seat is (at least partially) responsible for that
>>
>> During the last ride I had the idea to drastically change the concept
>> of the seat:
>> To divide in two parts. One (small) part for my butt and the larger
>> part for my back. The part for the butt will be attached to the front
>> part and thus will rotate together with my legs during steering. The
>> back part is fixed to the rear frame.
>>
>> With this configuration I hope to get better feeling for steering and
>> reduce the motion of my upper back.
>>
>> Does anyone have any experience with such a parted or flexible seat. I
>> don´t want to run in the wrong direction and after hacking my seat in
>> two parts there will be no way back (except building a new one).
>>
>> P.S.: my python is a dual 622 configuration with road tyres and
>> adjustable pivot angle trough rod end bearings
>>
>> ------------------------------
>>
>> Subject: [python] Re: Flexible / parted seat
>> From: Kelvin Arthur <kelvin.arthur@xxxxxxxxx>
>> Date: Fri, 6 Sep 2013 06:51:03 +1200
>>
>> Hi Erik
>>
>> Welcome to the python club!
>>
>> I sounds like an interesting proposition to divide the seat, I have my
>> doubts as to how successful it would be, you can only try I suppose.
>>
>> From my experience in learning how to ride, by the time I had ridden
>> 50-60km I was able to stay upright for a few hundred metres, was gaining a
>> lot of control, but I still required half a road and was all over the show.
>> It was during this time that I wrenched my back a few times because you
>> are actually able (within reason) to recover control when things aren't
>> going right. The last time I fell off through loss of control was at the
>> 200 km mark. Sounds sad, but that's just how it was! To be fair, I was
>> not falling off much after 100 km, but I think you may have to just push
>> through your next few rides and you may well find that it comes right for
>> you.
>>
>> An easier (maybe) way to make your ride more stable is to lengthen the
>> wheelbase a little, it does depend how you have made it as to how easy this
>> will be. My python went through a heap of changes during the first few
>> hundred km, one was to shorten the wheelbase about 120mm, this had a
>> surprisingly significant effect on how twitchy the bike was.
>>
>> My few cents worth.
>>
>> Kelvin
>>
>> Sent from my iPad
>>
>> On 6/09/2013, at 2:04, Erik Wassermann <erik.wassermann@xxxxxxxxx> wrote:
>>
>> > Hi Everyone,
>> >
>> > after finishing my first python and driving the first 50-60km I´m
>> > still not really satisfied with my seat.
>> > I use a diy plywood/ rib seat like some others too. When cruising
>> > around I often have problems to hold the upper part of my back down to
>> > the seat and the ride becomes really unstable. I have the impression
>> > that the whole tilting and twisting of my butt and lower back on the
>> > rigid seat is (at least partially) responsible for that
>> >
>> > During the last ride I had the idea to drastically change the concept
>> > of the seat:
>> > To divide in two parts. One (small) part for my butt and the larger
>> > part for my back. The part for the butt will be attached to the front
>> > part and thus will rotate together with my legs during steering. The
>> > back part is fixed to the rear frame.
>> >
>> > With this configuration I hope to get better feeling for steering and
>> > reduce the motion of my upper back.
>> >
>> > Does anyone have any experience with such a parted or flexible seat. I
>> > don´t want to run in the wrong direction and after hacking my seat in
>> > two parts there will be no way back (except building a new one).
>> >
>> > P.S.: my python is a dual 622 configuration with road tyres and
>> > adjustable pivot angle trough rod end bearings
>> > ============================================================
>> >
>> > This is the Python Mailinglist
>> >
>> > //www.freelists.org/list/python
>> >
>> > Listmaster: Jurgen Mages jmages@xxxxxx
>> >
>> > To unsubscribe send an empty mail to
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>> > ============================================================
>> >
>>
>> ------------------------------
>>
>> End of python Digest V11 #45
>> ****************************
>>
>>
>
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