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Tire force combining review
05-17-2018, 10:27 AM, (This post was last modified: 05-17-2018, 10:32 AM by NaN.)
#46
RE: Tire force combining review
Here I am back again playing around with tire physics Smile

Some time ago I've added a tire size correction factor function to the Pacejka tire model. The calculation is derived from the physical model, scales max friction based on tire dimensions.

The results are pretty good. Looking at the 360, with its 215mm front and 275mm rear tires, the maximum rear tire force is scaled so that the yaw torque on the car when sliding is almost zero (it is a tiny bit larger on the rear, like 1%). This explains the neutral handling, and also the reason why the car has those tire dimensions!

To test this observation I've looked at the F1-02, another car that is hard to handle. I replaced the custom tires with the default racing variant to enable scaling, increased rear tire width from 355mm to the 380mm per F1 rules, adjusted ballast position to get front weight from 43% to 44% as stated in the specs. And again I am getting zero yaw torque, which is pretty cool.

I'll push the F1-02 changes soon, maybe also add yaw torque calculation to cartest, as it allows to see how well balanced a car is.
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