Re: [ST] Suspension upgrade (was: Sprint ABS)

[Matthew Heyer <matthewheyer@xxxxxxxxx>]

Progressively wound springs do not act with damping effect.  Where the similarity might arise is that when riding hard.  When cornering, accellerating or braking hard, the first softer area of the spring is already compressed and thus the suspension travel is occurring in the stiffer area of the spring.  When just going easily down the road, the suspension should be using the softer area of the spring.  A progressively wound spring just changes the actual spring rate as it is compressed.  Softer initially, and then stiffer the more the spring is compressed.  Damping is completely different in that it works to impede either the compression or rebound of the spring.  Think of compressing a spring and letting it go.  Then do the same thing with the spring in a tub of honey or something.  The honey would be acting to slow the expansion of the spring (thus damping it).  The same effect can be had for the compression process.  And this acts throughout the entire range of the
 spring.  The assumptions used in making the two statements about high-speed versus low-speed bumps in progressively wound and damped springs is what makes the verbage come out the same.  But they are not doing the same thing.
 
Matt Heyer


----- Original Message ----
From: Emile Nossin <Emile@xxxxxxxxxx>
To: ST@xxxxxxxxxxxxxx
Sent: Tuesday, February 14, 2006 4:03:48 PM
Subject: Re: [ST] Suspension upgrade (was: Sprint ABS)


>From: Blake Sobiloff
>An emulator gives you independent control over both the compression  
>and rebound settings on the front forks. It also has different  
>settings for high-speed (sharp) bumps versus low speed (gentle  
>oscillations) bumps.

That sounds a lot like the explanation of behaviour on progressively
wound springs as well, which I read in an article about hyperpro.
Comfort on oscilations, firmness when braking and encountering
sharper offsets in turns. I guess the change in winding also acts
as a damping effect?

Emile
www.piloot.com

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