Greg Locock wrote: ↑
Fri Aug 11, 2017 9:56 am
If 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/.
Might be a bit OT, but always wondered about this;
In old cars, particularly pre-war, you often see positive camber at the front. I always assumed with was to minimise the scrub radius, so the contact patch basically rotates around the intersection of the KPI axis. And I thought this was to reduce steering effort and kickback.
I guess I'm completely wrong given what you say about having a large scrub radius, allowing the wheel to roll.
Any ideas why this was then?