[python] cruzbike psi

Hi again,

i forgot to mention where you could find some info about my bike,
http://www.nupi.nl/index.php?id=8abf5c5a9e
called it camel bike?

also attached a picture about psi force.

notice the three forces,
psi force, forward pedal force, frame reaction force

the psi force is a function of how far the pivot is placed backwards i guess.
(the further to the back, the shalower the angle of the frameforce, the smaller 
psi force)
also offcoarse the narrower the pedals are placed to the frame the better.

//dj

JPEG image

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