[python] Re: FWD/RWS tadpole

That trike link is pretty cool.  It looks like the Christiania trikes, but
the rear steer would really make them maneuverable.  The FWD/RWS tadpole
that was built by Ian Sims (Greenspeed), according to him, was fast, easy to
control and they actually raced it successfully.  I still can't find a
picture of it but the steering was based on the Dymaxion.  Paul said that
the trick to rear wheel steer is to have the pivot aboslutely vertical with
ZERO trail.  While zero trail produces no steering "feel" or "weight" they
fixed that by adding springs to the steering linkage so the rear wheel had
some artifical "weight" to the steering inputs and it would also self-center
then.  If I remember correctly, they didn't use a steering damper because
with zero trail, there was no tendency for the rear steering wheel to shimmy
to one direction or the other.  It was also only one wheel drive to the left
front wheel.


> Oh never heard of sidewinder! Thanks! I am _considering_ building a
> tadpole ... and FWD/RWS seems to be ideal -- if the speed problem can be
> solved. I knew actually of a rear steered tadpole before, but upright.
> Here it is:
>
>     http://www.sortejernhest.dk/christiania-cykel/index.jsp
>
> You see it quite often in copenhagen. They use a steering damper, may be
> exactly to take away oscilations from riding at speed.
>
> Dirk
>
> 25hz wrote:
> > The one that comes to mind right away is the Sidewinder:
> > http://www.sidewindercycle.com/
> >
> > I remember two others, but will have to track them down if I can
remember
> > where/what they are.  There are also a few FWD tadpoles but they are
FWS,
> > not to mention a 3 wheel drive Russian tadpole.
> >
>
> > A couple other RWS/FWD deltas are the Vacuum, that I plan on building:
> > http://fleettrikes.com/vacuum.htm
> > A FWD/RWS delta ice racer:
http://fleettrikes.com/gallery.htm#fwdrwsdelta
> > I think Ian Sims of Greenspeed fame built a FWD/RWS tadpole and raced it
as
> > well.  I know I have a picture of it somewhere.

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