Hi Jürgen and All, I am trying out your design on a social quad-cycle. It's on my Facebook project page at http://www.facebook.com/pages/Futon-Express/188109521199076 My kids named it "Bango" The Bicycle Tango, social quad-cycle, dual front wheel drive, hands-free steering design (Python), no steering linkage so riders must work together to minimize tire resistance... Not sure if this fits into your original vision, but I think I got the idea from your photo http://www.python-lowracer.de/pics/gallery/P3%20and%20P1.jpg and inspirations from Pythoon http://www.youtube.com/watch?v=72dd2kHGxQM and Python Dou http://www.youtube.com/watch?v=vZyAnhnLljE Cheers, Vi
