[python] Re: rubber pivot
- From: olaf <noll@xxxxxxxxx>
- To: python@xxxxxxxxxxxxx
- Date: Sat, 5 Feb 2005 13:03:00 +0100
Hi all,
Here is a vague theory on scientifically shaky grounds:
When comparing how difficult or easy different pythons are to ride we
usually compare angles and measures of the bike itself without relating
them to the rider. Important for the experience is perhaps also where
and how the rider is placed on the bike.
I have looked through python pictures taken from the side with rider
mounted. There aren't many, but enough to see that there are
differences in where the pivot is situated in respect to rider's body.
When turning a python you use the lower part of your body, the movement
begins where the thigh bones connect to pelvis, the rest of the upper
body is static. The movement is circular and the centre of this circle
is in the middle of your body. Now if the bike doesn't fold right below
that centre it will become heavy and unstable to execute this movement,
increasingly so the further away from the centre you get. You and the
bike aren't aligned.
So perhaps, and here comes the theory, it is important for stability
and balance that the pivot is placed below the centre of leg movement
AND that the seat and pivot angle are aligned so when drawing a line
from the pivot showing the extension of the pivot angle, it should
continue upwards through the middle of the riders body.
olaf
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