[python] Re: positive trail scetches

Cool.  I finally understood Dirk's ideas of his two steering linkage designs
after I could see his cardboard mock-ups.  I hadd no idea what he was
talking about prior to that, even with the sketches :)

Too bad the other dude didn't report back on how his Vython worked out.
Maybe it didn't work and that's why he stopped?  Might be another
interesting variant to try out.  His pivot links weren't as long as the ones
made by Dirk though, so I guess the two wouldn't handle in the same way.

> Hi DJ,
>
> >to explain some what i have been babeling about,
> >some sketch and model in cardboard
>
> you just re-invented the 4-bar-linkage steering system,
> that Michael Rienstra from California proposed about one
> year ago.
>
> Michael even built a prototype that he called "Vython":
>
> http://www.python-lowracer.de/pics/Michael_Rienstra_Vython.jpg
>
> Later he run out of time, energy, money or motivation and so
> we do not know the result of his experiments. Hope he did
> survive the test ridings ;-)
>
> The virtual steering pivot surely would produce positive trail,
> resulting in a Tom Traylor style geometry. The steering system
> to me seems quite complex and vulnerable.
>
> Also I am still wondering if a pivot axis that is not going
> through the hips causes steering/pedalling perturbances.
>
> Cheers,
> Jürgen.

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