lower ball joint location

[ashutk]

I was going through RCVD when i stumbled onto something and i quote "On race cars the height of the lower ball joint should be as low as possible on the upright for structural reasons". would anyone tell me what those stuctural reasons are??
If i keep the lower ball joint that low, olleys formula would give me absurd ratios
a high LBJ to UBJ ratio and thus higher ratios of the arms, much less than practicable ??
please try and explain

[acedeuce802]

Think about a lateral force, and where it acts as a tire. Then think about the moment that it creates in the suspension (when the load goes through the wheel/hub/upright/control arms). The lower the lower ball joint is, the lower reaction force there is, resulting in less compliance. A large, thin upright is better than a small bulky upright. The combination of the reduction of moment and higher moment of inertia of the upright make a large thin upright more capable of being very stiff, while also being relatively light.