Originally Posted by
jonathanb715
Originally Posted by njkayaker
It's important to understand that the point in the center of the contact patch directly under the hub is a point on a circle of a rigid (nondeformable) wheel, the circumference is less than the tire circumference. The circumference of that virtual wheel is the circle whose radius is the height of the center of the hub from the ground.
Uh, the data from the engineering forum regarding car tires doesn't support that assertion either.
"Distance traveled is somewhere in between what the free radius and the loaded radius predict."
JB
Yes, I think they are talking about the difference between "static" and "dynamic" rolling circumference (which I mentioned earlier)! This difference is speed dependent.
Anyway, what you are talking about is a
refinement of understanding what is going on. You have to clear what I am saying as a
starting point.
Pointing out that reference as showing an "error" in what I was saying proves that
you still don't get the main point!