4 Bar Linkage Calculator v3.0 - Suspension Anti-Squat & Roll Center Worksheet

This document is a screenshot of a spreadsheet titled "4 Bar Linkage Calculator v3.0," used to design and analyze a four-link suspension geometry. It displays two side-by-side data panels — Static Geometry and Bump Geometry — each listing coordinates (x, y, z) for the frame ends and axle ends of the Upper Links and Lower Links, along with computed vectors, link lengths, unit vectors, intercepts, roll points, vertical/horizontal slopes, and link forces (6512 lb static, 8646 lb in bump). Each panel includes a Geometry Summary showing Anti-Squat percentage (75.849% static, 31.332% bump), roll axis slope (both indicating roll understeer), roll center height (30.460 in static, 37.656 in bump), roll axis angle, and instant center X/Z axis locations. Inputs at the top show a travel increment of 1.00 in, travel amount of 7.00 in, and a pinion angle change of 3.30 degrees over travel. A plotted graph shows the linkage layout in side view with Bump and Droop toggle buttons. Below is a large data table of tire path coordinates (front and rear tire x/z positions by angle), IC trace upper/lower lines, anti-squat line, anti-squat CG points, and top-view link coordinates. A reader can learn the exact link mounting coordinates and resulting suspension behavior for this design study.