Friction Circle from the Driver's Perspective....
|
Custom-steering wheel inventor, Ed Dellis, explained how the Friction Circle is backwards from the driver's proprioception standpoint.
The original sign convention was based on the Free Body Diagram, and it described the forces acting ON THE TIRE which is exactly opposite to what the driver feels. Besides being counter intuitive, it's meaningless when you're seated behind the wheel and you're trying to find the cornering limit of adhesion. Instead, the Fuzzy Dice Paradigm corrects this, and is 100% consistent with the sensations you feel. |
The Hairbursh and Balloon shows how a tire can go in a different direction from where it's pointing BEFORE it loses traction due to flex in the system. Obviously, it can go in a different direction after it's sliding.
A Rubber Rudder that's cut in 30% from the trailing edges is a good model to visualize how a tire transitions into the sliding coefficient of friction when traversing up the mu-slip curve (see yellow diagram above in the page header) and the cornering force INCREASE per degree of steering wheel angle starts to diminish. |
