Quote:
Originally Posted by sosidge
Yes, I agree with the energy analysis, and also an analysis based on cosines of a difference in position of the input and output of the bars. I think I have mentioned the energy analysis myself already. It's the lever length analysis that I can't agree with.
Doesn't really matter ultimately - I have done an empirical test and seen the results. I have seen a few explanations based on sound science. My mind is at rest.
I only asked the topic in the first place because the .047thou bar (~1.2mm) on the B4 behaves in a much softer way than the 1.2mm bar on the Yokomo, and the 1.2mm bar on the Tamiya.
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Two different roll bars design may be different for a same diameter for multiple reasons : Pick up points on the arms is an obvious one, but also the length of the central section of the ARB has a big influence as the twist rate / unit length is mainly what we're interested in. And ultimately the length of the ARB arms as we've established that they do indeed bend in our case.
Also don't forget the angle between the ARB arm and the link between it and the wishbone has an influence too.