[python] Re: FWD tadpole for velomobile
- From: Vi Vuong <vi_vuong@xxxxxxxxx>
- To: "python@xxxxxxxxxxxxx" <python@xxxxxxxxxxxxx>
- Date: Mon, 29 Aug 2011 20:03:25 -0700 (PDT)
The tadpole axle / pivot idea is influenced by ChrisLuxembourg's RWD leaning
tadpole design, http://www.youtube.com/watch?v=iDT76I3ePbc, which seems quite
good. For python, both feet/BB and upper body can lean into the corner, and
may achieve more stability. The rear pivot may further reduces the turning
circle, plus folding / dis-assembly potentials courtesy of FWD.
I am still not sure about pursuing suspension on the first build, but here is a
simple python front suspension that may do well.
http://www.flickr.com/photos/python_uploads/2827143719/in/photostream. The
pivot angle variation/adjustment of this design is also very interesting? Any
more info on this bike / builder?
Vi
>________________________________
>From: "dirk@xxxxxxxxxx" <dirk@xxxxxxxxxx>
>To: python@xxxxxxxxxxxxx
>Sent: Monday, August 29, 2011 4:23 AM
>Subject: [python] Re: FWD tadpole for velomobile
>
>
> Hi,
>
>well that is the full works of a suspended steering axle. I think that a
>pythonesque approach as you had in mind is a lot simpler. I would separate the
>cross beam from the left to the right support wheel from the "main" python
>body to prevent that one wheel lifts up and to allow for tilting.
>Steering is another problem in your design. If the front and rear wheel
>dictates the way forward then this axle somehow has to follow!
>
>greetings,
>DirkS
>
>
>Vi Vuong <vi_vuong@xxxxxxxxx> hat am 25. August 2011 um 16:42 geschrieben:
>
>> Hi Dirk,
>>
>> Regarding suspension, is this what you have in mind?
>> http://www.youtube.com/user/scbvideoboy, great build video log...
>>
>> Vi
>>
>>
>> >________________________________
>> >From: "dirk@xxxxxxxxxx" <dirk@xxxxxxxxxx>
>> >To: python@xxxxxxxxxxxxx
>> >Sent: Thursday, August 25, 2011 4:00 AM
>> >Subject: [python] Re: FWD tadpole for velomobile
>> >
>> >
>> > Hi all,
>> >
>> >if the cross beam with the two wheels is suspended and allows for some lean
>> >steering, this could work. You could attach some handle bars to it to
>> >control the leaning.
>> >
>> >- DirkS
>> >
>> >
>> >Gerald <bepb@xxxxxx> hat am 24. August 2011 um 21:16 geschrieben:
>> >
>> >> Hi Vi,
>> >> Very unusual, the for a four wheel configuration. But I think if the
>> >> tadpod would stand on an uneven surface, you might face hanging in the
>> >> air with the driven wheel.
>> >>
>> >> For the three wheel configuration, I think, the issue is a suitable
>> >> drivetrain. Thats why I dug out the Russian trike. If nothing else, the
>> >> hubs of the frontwheels are about what you need.
>> >>
>> >> But maybe a trike configuration python with a two part shell fairing
>> >> would also be an option.
>> >> Two part in a way that allows the fairing to bend with the trike.
>> >>
>> >> Gerald
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >> On 24.8.11 16:33 , Vi Vuong wrote:
>> >> > Hi Dirk & Gerald
>> >> >
>> >> > Here is a blend of several ideas from suggestions. It's a cross
>> >> > between a quad / outrigger / shopping cart / solar panel, and a pivot
>> >> > overload... http://www.youtube.com/watch?v=IK9ynAhUFUc
>> >> >
>> >> > Vi
>> >> >
>> >> >
>> >> > Hi Vi,
>> >> > a simple solution would probably be a non tilting, rigid front
>> >> > part with a central drive unit powering an axle that is connected
>> >> > to the drive wheels on either side. Since you cannot fall over
>> >> > that easily, you could probably lower the pivot angle to get more
>> >> > lean-steer effect (and seat rise for that matter) only on the back
>> >> > part on which you are seated. So the majority of the total mass
>> >> > would shift during a turn.
>> >> > Another idea i had some time ago was to have a similar setup, but
>> >> > not with a stiff axle through the center of the front wheel, but a
>> >> > stiff axle in front of those driven wheels. This axle would also
>> >> > act as a rotation center for a suspended front wheel on either
>> >> > side (putting a normal bikes rear wheel drive chain to that axle
>> >> > on either side). A "steeringhandle" would then be used to solely
>> >> > adjust the lean factor, but not the steering which is still
>> >> > controlled by your feet.
>> >> > I planned to have similar sprokets on the wheelaxle and the
>> >> > driving axle in front, to create not lag during suspension.
>> >> > Also, i wanted to use stiff ropes from paragliders connected to
>> >> > both front wheel centers and "hang" the frame onto them while
>> >> > connecting them with the lean-steer-handles. Leansteering would
>> >> > then pull the frame up on one side of the frame, while lowering it
>> >> > on the other...
>> >> > greetings,
>> >> > DirkS
>> >> >
>> >> >
>> >> >
>> >> > ------------------------------------------------------------------------
>> >> >
>> >> > *From:* Gerald <bepb@xxxxxx>
>> >> > *To:* python@xxxxxxxxxxxxx
>> >> > *Sent:* Sunday, August 21, 2011 8:55 PM
>> >> > *Subject:* [python] AW: FWD tadpole for velomobile
>> >> >
>> >> > Hi
>> >> > I think there is or maybe was a front wheel driven tadpod from
>> >> > Russia, the S-327. On the page
>> >> > http://www.trike.ru/en/photos.php are some pictures off an three
>> >> > wheel drive tadpod trike, S-3 3x3 which could be an evolvement.
>> >> > But both are steered by handelbars.
>> >> >
>> >> > Gerald
>> >> >
>> >>
>> >
>> >http://dirk.steuwer.de
>> >
>> >
>
>http://dirk.steuwer.de
>
>
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