[python] Re: Python Seat and ergonomics
- From: George Durbridge <gdurbrid@xxxxxxxxxxxxxx>
- To: python@xxxxxxxxxxxxx
- Date: Tue, 12 Feb 2008 07:04:36 +1100
Nico,
This response isn't about seats for Pythons, so much as recumbent seats
generally.
The best angle between the torso and the legs seems to be 120 degrees,
+/- 5 degrees. That is the angle between the seat back (ignoring any
lumbar support bend) and the line from the base of the seat to the
bottom bracket.
The lightest and stiffest seat seems to be one-piece fibreglass or
carbon fibre shell. There are several types available to buy. But they
tend to collect sweat. Some of them have drillings and foam designed to
allow air to reach the back.
Mesh over a tube frame is light and cool, and gives fair support,
particularly if you keep the mesh tight and bend the frame so as to
support the lumbar area (lower back), as Greenspeed now do. Australia
is hot, and we use mesh seats a lot.
Beginning recumbent riders seem to like head supports, but experienced
recumbent riders tend not to fit them, or use them if they are fitted.
You get accustomed to holding your head up, and the support transmits
bumps from the frame into your head.
George
On Mon, 2008-02-11 at 17:38 +0100, Super Nabot wrote:
> Hi everybody,
>
> I am planning to build my first python (I think I will do it this
> spring, I'm starting designing it at this moment).
>
> There are plenty of good "studies" on the wiki and on different
> websites (Pivot angle, PSI,...), but I didn't found anything about the
> seat.
> I think this is very important to have a comfortable and efficient
> position, in order to avoid things like back pain, injuries,...
>
> I don't really know which kind of seat would be appropriated to a
> python (torso-legs angle, one-piece -which kind of shape- or back+
> shoulders, is a Head-rest necessary,...).
>
> I hope someone has pieces of info about these points.
>
> Regards,
> Nico (France, Nord)
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