[python] Re: Python trike ideas

He mentions using some 10mm plate, but says the frame would have weighed
more in steel.  The second prototype frame weighs 8kg, as against 10kg
for the first prototype.

On the drawing, bike forks are not designed to be mainly loaded in
bending: they are mainly struts, designed to be loaded in compression.
I have seen a bike fork fail when used reversed so that it carried a
bending load.  However, a lot of home builders (not just Pythonauts)
have succeeded in using them to support rear wheels, with and without
bracing to relieve them of bending loads.

On Thu, 2007-09-06 at 21:47 +0200, Stefan Bartels wrote:
> The "massive" construction of the Hipparion - can it be due to the fact 
> that he uses aluminum?
> Yours Stefan
> P:S:: Any comments on my drawing??? Please???
> 
> Jürgen Mages schrieb:
> 
> > Hello George,
> >
> > Yes, the Hipparion is the only other neg. trail delta trike I know and 
> > it is definitely older than the python trike. It is linked on my page 
> > and I already had some mail conversation with the finnnish designer 
> > Esko Meriluoto: He could not imagine that a two wheeler with neg. 
> > trail is rideable at all.
> >
> > The geometry of the Hipparion and a Python Delta is quite similar, but 
> > the Hipparion is distinguishable trough its steering-damper (which 
> > Esko regards as a must) and its massive frame construction (no idea 
> > why, maybe its the roads in Finland?).
> >
> > Cheers,
> > Jürgen.
> >
> >
> > On 05.09.2007 11:39, George Durbridge wrote:
> >
> >> On Mon, 2007-09-03 at 22:47 +0200, JÃŒrgen Mages wrote:
> >>
> >>> Pictures, there are a lot. Instructions few. Maybe I should do a 
> >>> trike side on my page, where all info is gathered.
> >>
> >>
> >> Good idea.  In the meantime, there is a good drawing of a Python-like
> >> trike at http://personal.eunet.fi/pp/davinci/proto2eng.html
> >>
> >> The Hipparion isn't strictly a Python, because the first prototype
> >> Hipparion was made before the first Python.  But it's a negative-trail,
> >> centre-steered delta trike, seemingly pretty well developed.
> >>
> >
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-- 
George Durbridge
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+61 409 413 945

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