[python] TT-bike and trike conversions

Hi again,

much thanks for all the advice in trike-construction, specially to "25hz" 
(sorry, I didn´t find your name!) for stub-axle-hub tips and to George 
Durbridge who opened my eyes for a special python-trike-dilemma: You have to 
put the center of gravity (cg) forward to make the negative-trail-concept work, 
but you loose cornering stability in the same moment. Most conventional delta 
trikes (f.e. Haase Kettwiesel)have the seat far back for safe cornering. 
Hipparions work, but there are more efficient trike lay-outs. After my 
test-ride I´m still a bit trike-crazy, but I think I will switch to a low 
tadpole-trike. Finnished first drawings ... ;-)

On the two-wheeled side, I´m still not shure, if the python is the right 
concept for me. If I want to have a challenge in ballancing, I take my Unicycle 
... sorry, what I wanted to say is: I have not enough leisure time to build 
bikes ONLY as an experiment. A new bike must work on my daily long rides 
without a few weeks or months of training. So the most I heard about the 
TT-bike concept is music in my ears and I´m happy about Jürgen´s idea to 
compare bikes to their steering pivot position and resulting PSI. When I 
compared the TT-clones in Jürgen´s list, I saw that Jürgen Maiers bike has 
(nearly) no or a slightly negative trail (?), but Laurent´s bikes have a solid 
amount of psitive trail. Laurent told us that he can ride hands off or even 
with only one pedal and didn´t complain about PSI. Jürgen Maier´s bike has 
noticeable PSI. May be the effect of trail is bigger than the effect caused by 
the distance between hips and steering axis??? 

@Mike Channon: Please tell me more about your TT-clone (dimensions, trail, 
...)and your experiences with it! 

@Laurent Dechenne: On Your Homepage-update from 04-04-2005 I found pictures 
from an ultra low racer. Was it driveable? What were your experiences with this 
layout?

Still open for any input ...


Cheers,
Christoph

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