[python] Re: Python Projects Survey

>
> Hi folks,
>
> two years have past since my first experiments of
> developing a new recumbent design.
> Time for some survey and contemplation.
>
> The first result is, that I have found my (so far) all-time
> favorite bike which has materialized as "Python P3" in
> April 2004. Since then I have used it almost everyday for
> commuting and recreation (4000km).
>
> In my hometown Erlangen there are two more pythons in use.
> Eveline rides P1, the still existing first prototype and Peter
> his P2, which is still unfinished and incomplete but reasonably
> rideable.
> The fourth python (a 24" version) which I built for my daughter
> is still incomplete and 2 cm too long for her. We have to wait
> until next year. To me, P4 is the most beautiful creation so far.
> It is the first that uses tapered roller bearings for the steering
> pivot.
>
> There are other projects known from the mailinglist:
>
> - Laurent Dechenne from Belgium
> - Torben Scheel from Denmark
> - Jürgen Maier from Germany
> - Alain Branca from Corsica
> - Euardo LP jr from Brazil
> - Michael Rienstra from California
> - Mike Channon from Canada
> - Burket Kniveton from California
> - Stefan Knorr from Germany
> - Scott Rose from Washington
>
> It would be informative and helpful if these builders,
> write us some words about their project status, new
> building or riding experiences and their future plans.
>
> @Torben: I saw that you have updated your blog
> http://www.scheel.net/HPV/Python/default.asp
> Do you think that the 30x10 tubing that you used
> for parts of your frame is too weak?

30*10*1,5 appears to be plenty strong for the front frame, my (Pythons) weak
spot is the brazing - I don't have access to a TIG or MIG. The front has
several 1,5mm steel enforcements, and I have tweaked the design a bit to fit
brazing. As an example, the dropouts are penetrating the tubes to get as big
a braze-surface as possible. The rear fork is without suspension, and I
suspect I can expect a failure at the brazings between the fork legs and the
40*40*1,5 main tube. Support struts from the rear dropouts (or right above
them) to the rear seatmount is something I'm planning at the moment, it have
to be light and adjustable to keep the seat adjustable. An architect lamp
usually have square tubing that would fit the design nicely.

Apart from this, I've finished the cabling, the brakes and derailleurs are
in place, so I just need a little bit of finishing before the spraygun can
be unpacked :-) Im really looking forward to putting the parts together
after the paint has hardened.

One little task remains to be done - the seatmounts have turned out OK, but
I need to make a quick release solution for them, so I can finish the python
as a "bike-in-a-bag" solution. I look forward to the day when i arrive at
the trainstation and 5 minutes later take of with just luggage and don't
need to argue with the train staff about the looks or length of my bike.

More here : http://www.scheel.net/HPV/Python/default.asp - no new pics, I'll
post here when I get to that.

Regards,
Torben


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