Hi Vi, it is another, somewhat redundant degree of freedom...there was a project a few years ago on this list. I brought up this issue once and juergen cleared me up on that ;-) i have my reservations whether one can safely control a double pivot setup. Maybe, if you link the two together, so you end up with connected steering? - DirkS Vi Vuong <vi_vuong@xxxxxxxxx> hat am 11. April 2011 um 06:36 geschrieben: > Here goes a bicycle version of the Skatecycle, same folding requirement as the > μPython, to fit in the back of small car boot with seat up. For 20" wheels, > double-pivot folding mechanism is used for max compactness. The seat is split > into 2 pieces, with the backrest mounted to the rear pivot to control the rear > wheel, which makes this bike all wheel steering (AWS), with rear wheel turning > only when the body leans into a turn. Turning feels tighter and smoother than > regular python; going straight is not too bad, but instability seems more > sudden > / unpredictable... > > Also see more use of sticks for stabilization > (skiing?) http://www.youtube.com/watch?v=USd9OYN4BEY > > > ________________________________ > From: Vi Vuong <vi_vuong@xxxxxxxxx> > To: Python <python@xxxxxxxxxxxxx> > Sent: Sat, April 2, 2011 10:39:48 AM > Subject: [python] 2-Headed Python (Skatecycle) > > > In case RWS is not challenging enough... > > Interestingly, first prototype has one 1 pivot like a python, then evolved to > 2 > pivots; see http://www.youtube.com/watch?v=kzoQ1JrTVgk&feature=related > > Vi http://dirk.steuwer.de