If you draw a line through the CL of the UCA pivots & another line though the CL of the LCA pivots
they will intersect at some point (as long as they are not parallel). That point is called the instant Center (IC)
and the UCA/Spindle/LCA assembly travels in an arc from that IC point. However far out that IC is
measured in inches
is called the Swing Arm length. More on this later.
Next you draw a line from the CL of the tire contact patch at ground level
to the IC. Do this on both sides
and where the two Tire CL-to-IC lines intersect
is the front roll center. Look at the drawing below. The colored dots represent the IC for the same color LCA/UCA. The black dot represents the static RC at ride height.
Make sense?
.
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Ron Sutton Race Technology
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