Ian,
The elephant in the room for me is still this idea that if the rear wheels both have the same tangent relationship with the corner and the steering is straight, they must be travelling at the same speed. The outside wheel is travelling at a greater radius, so unless it time travels, it has to cover a bigger distance in the same time-frame. So it is genuinely going faster. So there is always scrub unless the kart is going in a straight line.
d-i-y71, I'm not sure what you mean. I don't have any interest in being cleverer than anyone else, I just find that "un-physical" engineering arguments grate with me.
I don't have any use for the term "release", and I believe that the inside rear probably needs to stay pretty light most of the way out of a corner to avoid wasting power in scrub. So I THINK when there's grip a kart is effectively a 3-wheeler pretty well all the way round a corner. Might be wrong, have certainly been wrong before.
And yes Ian, it's always fun; you have always made me question my assumptions!
Liam
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