[python] Re: Svar: for August: stearing headset as pivot

Fanstastic web site tons of pics and tec info Thanks
  ----- Original Message ----- 
  From: dirk.bonne@xxxxxxx 
  To: python@xxxxxxxxxxxxx 
  Sent: Friday, March 23, 2007 12:21 AM
  Subject: [python] Re: Svar: for August: stearing headset as pivot


  There is not a lot of experience with this bike, Marc only uses it in the 
summer. So no long experiences with the wearability of the bearings. At the 
time of building, I betted upon that the highway position does not matter 
because of the large lever pivot - BB, but Marcel had another experience (see 
mail 25Hz).

  The weight won't be less then a BB solution as the inner tube is very fat on 
a bike (2mm wall). Although it looks airy it is not.

  But I guess the advantage for August is that he has a 60degree angle for free 
- the angle between the headset tube and the bottom tube of a bike. 

  Dirk

  Thomas Paul Jahn wrote: 
Hey August,
check the "python for Marc" on Dirk's page: 
http://dirkb.dnsalias.net/pythonmarc.html 
He used a steerhead as pivot. I am considering it too. But I guess there are 
pros and conts. The axis has a larger diameter, less weight (?) and would fit 
very well in my design. I am a little concerned about the bearing. From normal 
bikes I well know this phenomenon which we call Autobahnstellung "highway 
position" in german. I guess you know what I mean.
In the position as a pivot, there is certainly even more weight on the bearing.
And honestly, I always had trouble changing the headse once it is worn out. 
'had to use two componant glou as you hardly find the one that fits exactly.

So it is good you bring up the point. I guess Dirk can say something about it. 
I keep reading.:-)

cheers
Thomas

  "August" <augusthahn@xxxxxxxxxxxxx> 22-03-2007 17:40 >>>
        I will be trying to build a homemade python soon I,m getting some ideas 
from 
pics  i,v saved some of whice  i have included to explain my plans.I have 
some key points that are absolute:1 all aluminum-2 all bolt together useing 
AN grade hardware-3-16"or 20" wheels.Zero or very minimum welding required 
maybe just the headtupe ? does anyone know anyone who has used a streering 
headset for the pivot?
----- Original Message ----- 
From: "Jürgen Mages" <jmages@xxxxxx>
To: <python@xxxxxxxxxxxxx>
Sent: Thursday, March 22, 2007 3:59 AM
Subject: [python] Re: Self Centering vs. Wheel Flop


  Hej Dirk,

    In the model it could be better to do the rear part not as trike
wheels but instead to fix to the ground over a joint (scharnier)
located where normally the rear wheel hub is. That way the bike would
not hop around like a mad bull, though the arena scenery is quite
fitting for that.
      I will make a new model including yours and Stephan's ideas. Sounds
good.

BTW through the model I realised that it is not the weight of the whole
front part that favors the wheel flop, but only the weight of the part
that is NOT rising when the wheel turns. Roughly this is everything in
front of the line [axle - contact patch].

    I have downloaded the SDK for newton, as it should be possible to
feed the model programmatically and to extract graph material from
that. But I am not sure how much I will be able to play with it. At
the moment I am very busy with my job. :-(
      There is also ODE (Open Dynamics Engine) which is an open source
physics engine, but I have no experience with that. I also tried
the Newton SDK, but gave up due to lack of time and C++ skills.

Groetjes,
Jürgen.
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