He should read up on steering geometry in general. The wheel axis always needs to be offset from the pivot axis or the steering will be unstable. Take a look at your bicycle and you'll see that the axle of the front wheel is at an offset from the steering axis, because the fork is curved (or offset).
Is it possible you are using wrong terms here, or perhaps don't completely understand what this is about? For starters boards have 4 wheels, completely different from the 2 wheel countersteering business, and the axis is offset from the pivot point in all truck designs?
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.
Comments
He should read up on steering geometry in general. The wheel axis always needs to be offset from the pivot axis or the steering will be unstable. Take a look at your bicycle and you'll see that the axle of the front wheel is at an offset from the steering axis, because the fork is curved (or offset).
Is it possible you are using wrong terms here, or perhaps don't completely understand what this is about? For starters boards have 4 wheels, completely different from the 2 wheel countersteering business, and the axis is offset from the pivot point in all truck designs?
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.
Right, thanks for clarifying