4 Bar Linkage Calculator V3.0 - 4-Link Suspension Anti-Squat & Roll Geometry

This document is a screenshot of a spreadsheet titled "4 Bar Linkage Calculator V3.0," used for designing a four-link suspension. It compares "Static Geometry" against "Bump Geometry" at -7.00 inches of travel (the filename indicates this represents a short-link droop scenario), showing a pinion angle change of -1.99 degrees. For both upper and lower links it lists frame-end and axle-end 3D coordinates, link vectors, link lengths (upper 31.686 in, lower 38.000 in static / 39.319 in bump), unit vectors, intercepts, roll points, slopes, and link forces (6654 lb static, 4501 lb bump). Geometry summaries report anti-squat (68.458% static, 85.528% at travel), roll axis slope and angle (roll understeer statically, roll oversteer at travel), roll center height (30.490 in static, 22.857 in at travel), and instant center locations. A plotted side-view diagram shows the link geometry with Bump/Droop toggle buttons. Below are data tables for the chart: tire arc coordinates by rotation angle, instant-center traces for upper and lower links, anti-squat line and CG points, and top-view link coordinates. The document lets a reader evaluate how a specific 4-link setup's anti-squat, roll steer, and pinion angle behave through suspension travel.