[python] Re: AW: Python frame design (work in progress)
- From: Dirk Bonné <dirk.bonne@xxxxxxx>
- To: python@xxxxxxxxxxxxx
- Date: Mon, 09 Apr 2012 16:32:16 +0200
On 09.04.2012 01:33, Mike Power wrote:
> Would a space frame be as strong and lighter weight the parrallel
> 40x10x1.5mm bars?
Stronger and lighter is possible. For the front side the space frame
gives a great stiffness (zero flex). Also, using a space frame on the
front side, you can try to be weight weenie by taking advantage that
only a small part of the frame takes the hits from the road (only 4
tubes going from pivot to axle). The rest of the frame only needs to be
stiff enough for pedaling.
But building such a space frame is also much more work (I've build
several). And like George says, the many joint mean there are more
places where the frame can break (although it is the pivot area where it
is most troublesome).
An alternative design is going both ways. My first python was the baby
python (http://www.python-lowracer.de/projects.html#p06). I first had
30x10x1.5mm tubing, but I found it that the frame was flexing to much.
Adding 8mmx1mm round tubing framing on top (see the picture) made it
stiff. It was very simple to add and didn't change the weight much. I
think that baby python was one of the lighter pythons that way.
Personally I have never tried 40mm tubing height, but I would be very
surprised if it doesn't show flex too
Dirk
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