[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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>>     
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