> I certainly meant linear w.r.t. the eqm. position rather than to zero
> length. However, what Andrew suggests (though its not clear) is that
theres
> no force pushing out when the distance is smaller than the eqm. distance
> (rather like a bungee cord). If this is the case, then it is certainly
> non-linear wherever you look at it.

You are correct; when the link becomes shorter than a certain length, it
goes "slack", and produces no force at all. If it is longer than that
certain length, it pulls both ends towards each other.

Thanks.
Andrew.

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