What is the static anti-squat percentage in this suspension design?

The Geometry Summary shows a static anti-squat of 77%, and the travel anti-squat is also 77%.

What are the upper link coordinates?

Upper links: frame end at x=31.00, y=11.00, z=33.50 in; axle end at x=0.00, y=2.00, z=30.50 in.

What are the lower link coordinates?

Lower links: frame end at x=39.00, y=8.00, z=26.00 in; axle end at x=3.00, y=22.00, z=19.50 in.

What vehicle specs are used in this calculation?

Wheelbase 112.0 in, tire diameter 42.00 in, tire rolling radius 19.50 in, vehicle CG height 43.00 in, vehicle mass 6,000 lb, front unsprung mass 800 lb, rear unsprung mass 700 lb.

Where is the instant center located?

The instant center is at 138 in on the X-axis and 44 in on the Z-axis, with a roll center height of 30 in and a roll axis angle of 0 degrees (roll understeer).

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4-Link Suspension Calculator - 112in Wheelbase, 77% Anti-Squat Geometry Plot

Suspension 4-bar linkage geometry diagram with plotted links, roll axis, and wheel circles

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4-bar linkage suspension geometry diagram plotting upper and lower links, anti-squat lines, roll axis, and wheels.

AI caption June 2011 · Photo 151 of 846

This document is a screenshot of a spreadsheet-based four-link suspension geometry calculator, apparently used to design or analyze a link suspension setup. The top section lists vehicle specifications: 112.0 in wheelbase, 42.00 in tire diameter, 19.50 in tire rolling radius, 43.00 in vehicle CG height, 6,000 lb vehicle mass, 800 lb front unsprung mass, and 700 lb rear unsprung mass. Suspension geometry inputs give x/y/z coordinates for the upper links (frame end 31.00, 11.00, 33.50 in; axle end 0.00, 2.00, 30.50 in) and lower links (frame end 39.00, 8.00, 26.00 in; axle end 3.00, 22.00, 19.50 in). The Geometry Summary reports 77% static anti-squat, a 30 in roll center height, 0 degrees roll axis angle (roll understeer), instant center X-axis at 138 in and Z-axis at 44 in, plus travel values: 77% travel anti-squat, 29.82 travel roll center, -0.10° travel roll axis, 0.00° pinion change, and 0.00 travel amount/increment. A large side-view plot shows the link geometry, tires, anti-squat line, 100% AS line, roll axis, and roll center, with an inset 'Travel' chart. A reader can learn the exact link coordinates and resulting anti-squat/roll geometry for this suspension design.

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Frequently asked questions

What is the static anti-squat percentage in this suspension design?: The Geometry Summary shows a static anti-squat of 77%, and the travel anti-squat is also 77%.
What are the upper link coordinates?: Upper links: frame end at x=31.00, y=11.00, z=33.50 in; axle end at x=0.00, y=2.00, z=30.50 in.
What are the lower link coordinates?: Lower links: frame end at x=39.00, y=8.00, z=26.00 in; axle end at x=3.00, y=22.00, z=19.50 in.
What vehicle specs are used in this calculation?: Wheelbase 112.0 in, tire diameter 42.00 in, tire rolling radius 19.50 in, vehicle CG height 43.00 in, vehicle mass 6,000 lb, front unsprung mass 800 lb, rear unsprung mass 700 lb.
Where is the instant center located?: The instant center is at 138 in on the X-axis and 44 in on the Z-axis, with a roll center height of 30 in and a roll axis angle of 0 degrees (roll understeer).