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Message: [QUOTE="KiwiBird, post: 24444, member: 17232"] Most of the answers here have talked about static measurement of the spring, how does the spring length/form affect the dynamic characteristics? What is the idea of a barrel shaped spring? Why do some springs have one end narrower than the other? Jer talked about (I'm about to murder his explanation here) how the spring is compressed and the load is transferred down through the coils - like a wave, imagine whacking the spring with a hammer. If you have different lengths/same rate does the harmonic resonance (don't know if that's the term) the same? [/QUOTE]