[python] Re: Experimental Prototype PX
- From: Jürgen Mages <jmages@xxxxxx>
- To: <python@xxxxxxxxxxxxx>
- Date: Sun, 27 Feb 2005 12:49:08 +0100
This morning I had a test ride on PX.1:
Pivot angle: 41 deg
Trail: -31 cm
Seat height: 34 cm
Wheelbase: 121 cm
Clearance: 14 cm
Wheels: 2x24"
After 15 min of trying it was obvious that this bike is
NOT rideable at slow speeds.
The front part bounced from one side to the other and I
felt like sitting on a seesaw.
The pivot angle was way too shallow!
Self-centering force and wheelflop were constantly
fighting each other for the leadership.
Being hell-bent on making this beast rideable, I
chopped it up into two halves and welded them
together with a more steeper angle. 40 minutes
of work.
Here is the data of PX.2:
Pivot angle: 54 deg
Trail: -33 cm
Seat height: 41 cm
Wheelbase: 121 cm
Clearance: 19 cm
Wheels: 2x24"
Riding behaviour of PX.2 was remarkably better.
No more wheelflop, no pedalling/steering
interferences and very agile in curves.
After 10 minutes of practice I could make
sharper U-turns than with P3!
With cautious optimism I would say that the
PX.2 geometry is generally better than P3!
The high speed coasting capabilities will be
explored, when the streets are free from snow
and ice.
Another thing is that the seat has to be lowered
by at least 10 cm, so that I can touch the ground.
Cheers,
Jürgen.
PS: Pictures soon on my website.
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