Might be a bit OT, but always wondered about this;Greg Locock wrote: ↑Fri Aug 11, 2017 9:56 amIf we turn back the clock 60 years to when road cars, by and large, did not have PAS, you need
-large scrub radius (say +100 mm) - this allows the wheel to roll when you are parking on a flat surface (ie no brakes) = only important at very low speeds
-small castor and in particular kpi - try and reduce jacking
-bignum steering ratios
-big steering wheels.
Once you have PAS you can get rid of those limitations and start to concentrate more on what the driver would /like/ as opposed to /need/.
I've though this one though on another occasion and to me a large scrub radius, while introducing a rolling movement, doesn't remove the scrubbing component at the contact patch. The 'turnslip', as Pacejka defines it, remains the same between a low and high scrub condition. With high scrub, you are effectively dragging the wheel through the same angle range but over a larger arc and at a higher velocity as a a wheel with a low scrub radius. What do you think?
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