[python] vertical steering axis

Bill Patterson <wmpatterson@xxxxxxxxxxxxx>, an engineer, ex-academic and a high priest of human powered machines writes:
************************************************************************ ******************************************************************** We built several Flevo style bikes with vertical steering axis and 10 or more cm of trail and they were all very easy to learn to ride. ************************************************************************ ********************************************************************* 


A statement that grabs me more than any I've read in ages.

Questions:
1. Wouldn't a vertical steering axis in a python cause it to lose much of its self steering characteristic?
2. If a vertical steering axis works so well on flevos is it not in wide use? I read of so many horror stories of the problems in learning to ride flevos, air-bikes, and pythons.
The front drive, center pivot, seems the ultimate recumbent and surely will be the bike of the future BUT I get the uneasy feeling that there are still a few important break-throughs to be made. 

Regards to all you wonderful pioneers,

Oupa in South carolina, USA

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