[python] Re: FWD/RWS tadpole

Bingo . . .
Here:
http://www.ihpva.org/pipermail/trikes/2006-January/041612.html
and here:
http://www.ihpva.org/pipermail/trikes/2006-January/041629.html
http://www.greenspeed.com.au/tyabb.jpg



> 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

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