I am using non-standard terms, because that's what he's using. The angle between the steering axis (what he calls the pivot axis) and the vertical is usually called caster angle, and the offset between the steering axis and the wheel axle is usually called trail. He doesn't talk about trail directly, but he suggests that the pivot axis and hanger axis being different is a problem. If they were the same, there would be no trail, and that would be a problem.
Two and four wheel vehicles are not all that different as far as steering stability. Both need caster and trail for stability and responsiveness. Yes the control input is different.
I'm not saying he's entirely wrong, just that I don't think he's read much on steering geometry, and if he did he might understand the problem better.
Two and four wheel vehicles are not all that different as far as steering stability. Both need caster and trail for stability and responsiveness. Yes the control input is different.
I'm not saying he's entirely wrong, just that I don't think he's read much on steering geometry, and if he did he might understand the problem better.