[python] Re: Positive Trail using Hubless Wheel - use 4-bar link steering instead?

  • From: "dirk@xxxxxxxxxx" <dirk@xxxxxxxxxx>
  • To: python@xxxxxxxxxxxxx
  • Date: Thu, 28 Jul 2011 07:45:51 +0200 (CEST)

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
> > >
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