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Re: [ST] New Member

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If the rear wheel applies a moment to the SSSA, what resists that 
moment?  Specifically, what keeps the wheel's axle from rotating CCW 
looking from the rear?

If the rear wheel load is 400 pounds and the contact patch centerline is 
4" to the right of the center of the SSSA (essentially at the chain 
line), what keeps the 1600 in-lbs from rotating the whole swing arm CCW?

Philip Las Gourgues wrote:

>colt4530@xxxxxxxxxxx wrote:
>  
>
>>The "logic" is that the SSSA puts a moment (twist) into the frame at
>>the swing arm pivot and the DSSA does not.  The moment prestresses
>>the frame making it less likely to flex in some directions and more
>>likely to flex in others.
>>    
>>
>
>Why is that? As long as the wheel is mounted in line with the centre of the
>frame the same as the DSSA there would be no difference. OK so the weight of
>the SSSA would be off centre but the effect of that would be completely
>negligible. All the torsion would be within the structure of the SSSA itself
>as it transferred the forces around the wheel.
>
>Phil
>'02 S3
>
>
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>      The ST/RS Mailing list is sponsored by Jack Lilley Ltd.
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>
>
>  
>

- -- 
John Albright
'02 RS
Chattanooga
C-RATs


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If the rear wheel applies a moment to the SSSA, what resists that
moment?&nbsp; Specifically, what keeps the wheel's axle from rotating CCW
looking from the rear?<br>
<br>
If the rear wheel load is 400 pounds and the contact patch centerline
is 4" to the right of the center of the SSSA (essentially at the chain
line), what keeps the 1600 in-lbs from rotating the whole swing arm CCW?<br>
<br>
Philip Las Gourgues wrote:<br>
<blockquote type="cite" cite="mid083401c3ea14$77a2a860$0400a8c0@philip">
  <pre wrap=""><a class="moz-txt-link-abbreviated" href="mailto:colt4530@xxxxxxxxxxx";>colt4530@xxxxxxxxxxx</a> wrote:
  </pre>
  <blockquote type="cite">
    <pre wrap="">The "logic" is that the SSSA puts a moment (twist) into the frame at
the swing arm pivot and the DSSA does not.  The moment prestresses
the frame making it less likely to flex in some directions and more
likely to flex in others.
    </pre>
  </blockquote>
  <pre wrap=""><!---->
Why is that? As long as the wheel is mounted in line with the centre of the
frame the same as the DSSA there would be no difference. OK so the weight of
the SSSA would be off centre but the effect of that would be completely
negligible. All the torsion would be within the structure of the SSSA itself
as it transferred the forces around the wheel.

Phil
'02 S3


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<br>
<pre class="moz-signature" cols="72">-- 
John Albright
'02 RS
Chattanooga
C-RATs</pre>
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