Hi, if you dig through this list, you'll find some four bar linkage footage as well. Jürgen posted links to pictures some time ago. greetings, DirkS bren102 <bren102@xxxxxxxxx> hat am 28. Juli 2011 um 03:56 geschrieben: > Further thoughts: > > As well as raising the seat to maintain the line from the steering head axis > to hips to reduce PSI, another problem is the extra weight from all the > bearings and guides used to make the hubless wheel. > > Seems an easier way to go to maintain seat rising effect while creating > positive trail is to use a 4-bar link for steering, creating a virtual > positive trail. I created many drawings some years ago to figure out a working > model. Will dig around to see if I can find them. > > Regards, > > Brendan > > --- On Tue, 7/26/11, bren102 <bren102@xxxxxxxxx> wrote: > > > From: bren102 <bren102@xxxxxxxxx> > > Subject: [python] Re: Fw: Positive Trail using Hubless Wheel? > > To: python@xxxxxxxxxxxxx > > Received: Tuesday, July 26, 2011, 5:57 PM > > Hmm, it seems to me not necessarily a > > flevo or speculoos type steering as they have no seat rising > > effect to aid stability. > > > > As a technical exercise - looking at Dirk's python, extend > > the steering head forward horizontally to within the front > > wheel, but not past the front wheel axle, maintaining the > > same steering angle until the trail is positive. > > > > The seat rising effect still applies as the steering head > > is still at the same angle and is not horizontally higher > > than the front wheel axle. > > > > So, a python with positive trail! > > > > Maybe I should create a diagram? > > > > Regards, > > > > Brendan > > > > > > --- On Mon, 7/25/11, Michael Ostermeier <list@xxxxxxxxxxxxxxxxxx> > > wrote: > > > > > From: Michael Ostermeier <list@xxxxxxxxxxxxxxxxxx> > > > Subject: [python] Re: Fw: Positive Trail using Hubless > > Wheel? > > > To: python@xxxxxxxxxxxxx > > > Received: Monday, July 25, 2011, 3:48 PM > > > Hi, > > > > > > bren102 wrote: > > > > Perhaps the rider can be seated higher to > > maintain hip > > > alignment with the steering axis? > > > > > > Yes, but then you wont have a lowrider and end up > > having a > > > Flevobike. > > > > > > >> >> […] may allow a python with > > positive > > > trail to be built. > > > > > > This will get you a speculoos-type bicycle. > > > > > > Regards > > > > > > Miche > > > > > > PS: see: http://en.openbike.org/wiki/Front_Wheel_Driven_Bicycle > > > > > ============================================================ > > > > > > This is the Python Mailinglist > > > > > > //www.freelists.org/list/python > > > > > > Listmaster: Jürgen 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: Jürgen 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: Jürgen Mages jmages@xxxxxx > > To unsubscribe send an empty mail to > python-request@xxxxxxxxxxxxx > with 'unsubscribe' in the subject field. > > ============================================================ > http://dirk.steuwer.de