[python] Re: FWD tadpole for velomobile
- From: "dirk@xxxxxxxxxx" <dirk@xxxxxxxxxx>
- To: python@xxxxxxxxxxxxx
- Date: Mon, 22 Aug 2011 09:22:56 +0200 (CEST)
Vi Vuong <vi_vuong@xxxxxxxxx> hat am 21. August 2011 um 20:36 geschrieben:
> Hi All,
>
> I would like make another case for a center-steer FWD tadpole, not sure if we
> can call it a python tadpole when it's realized. Using the same pivot
> configuration as a bike, the trike could gain another driving wheel, as
> discussed here before in
> 2006, //www.freelists.org/post/python/Question-for-the-experts,4. The
> main requirement is hands-free riding like the delta version (all the time),
> but with improved high-speed stability / aerodynamics in velomobile
> application. The challenge seems to be making the differential / axle that
> retains the seat rise effect (tilting?). Any suggestions?
>
> Thanks,
>
> ViHi 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
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