It was in answer to a question regarding why the popular wisdom of toe out for turn in is correct, was answered by a chassis consultant specialising in handing and chassis set up, I typed the answer out for you:
"Cars do generally exhibit quicker initial turn in with static toe out. My analysis is that this does not have to do with the lateral (y axis, per SAE convention) forces from the front tyres, but rather the longitudinal (x axis) forces, which can produce yaw moments.
When a car is running straight, and the front tyres have either toe in or toe out, the tyres are both running at a slight slip angle, and accordingly generating both some lateral forces and some drag forces. The drag forces are roughly equal and additive. The lateral forces are roughly equal, and opposite in direction, so they approximately cancel.
When the steering wheel is turned just a tiny bit, one front wheel will be running straight, the other will be turned in to the corner, generating a bit of drag, and some lateral force in to the corner.
If the car has toe in, it will be the inside front wheel that's running straight, and the outside one that has some slip angle. In this condition, the lateral force creates a yaw moment into the turn, but the drag force creates a yaw moment out of the turn. The two yaw moment components are subtractive.
If the car has toe out, it will be the outside front wheel that's running straight, and the inside one that's making lateral force and drag force. Now the lateral and drag force both create yaw moments into the corner, and are additive. Consequently, the net yaw moment is greater, and the car experiences a greater yaw acceleration. That is it turns in quicker. "
It is a good magazine, I suspect you'd like it.
www.racecar-engineering.com
