Hi Vi, it just needs a connection to either part, not necessarily running above the wheels - although you could have a hanging, suspended rider :-) a gravity pivot is also clever! as long as the rider is lifted while turning, this should work. I guess preloading the pivot with i.e. a spring also works, so even a vertical pivotaxis would create a seatrise using this mechanism. Only this type of pivot does not act like a suspension at the same time. Well, maybe it does: the spring, that preloades the pivot could become preloaded through the riders weight :-) greetings, DirkS > Vi Vuong <dmarc-noreply@xxxxxxxxxxxxx> hat am 14. Mai 2014 um 06:03 > geschrieben: > > > Hi Dirk, > > It's kind of tough to run a beam from front to back above the wheels but lower > than 20cm in the middle :) How about a beam above the rider in case of a roof, > or one on each side in case of a trike? > > Regarding alternative seatrise mechanisms, maybe "gravity" pivot can help. > http://www.freepatentsonline.com/7013531.html > > Cheers, > > Vi > > > interesting bike! > >looks like the Spring beam with the seat on it needs to flex/shorten the > >distance when turning, leading to a seatrise effect that keeps the bike > >straight. > >I wonder, if thats a possible suspension solution for the low racer python. > >Instead of attachiung the seat to the rear end, there is a flexing beam > >running > >over the bottom bracket with a hinge on either end, attaching it to front and > >rear with parallel axis to the bottom bracket axis. On top of if the seat, > >suspended. > >Also it seems that by transmitting the riders weight via this beam into both > >parts, you could pre load this beam, thus variing the bikes tendency to > >return > >to a straight position. So we have another way to influence steering > >dynamics, > >not only with altering the bottom bracket angle? > > > > > >Greetings, > >DirkS > > > >============================================================ > > > >This is the Python Mailinglist > > > >//www.freelists.org/list/python > > > >Listmaster: Jurgen Mages jmages@xxxxxx > > > >To unsubscribe send an empty mail to > >python-request@xxxxxxxxxxxxx > >with 'unsubscribe' in the subject field. > > > >============================================================ > > > > > > > > ============================================================ This is the Python Mailinglist //www.freelists.org/list/python Listmaster: Jurgen Mages jmages@xxxxxx To unsubscribe send an empty mail to python-request@xxxxxxxxxxxxx with 'unsubscribe' in the subject field. ============================================================