What is the static anti-squat percentage in this link setup?

The calculator shows 66% static anti-squat, and the travel anti-squat is also 66% at 0.00 travel.

What are the vehicle specs entered into the calculator?

Wheelbase 112.0 in, tire diameter 42.00 in, tire rolling radius 19.75 in, vehicle CG height 43.00 in, vehicle mass 6,000 lb, and front and rear unsprung masses of 1,500 lb each.

What are the upper link coordinates?

Upper links: frame end at x=34.00, y=12.00, z=33.00 in; axle end at x=0.00, y=2.00, z=30.50 in.

Where is the instant center located?

The instant center is at 136 in on the X-axis and 41 in on the Z-axis.

What is the roll center height and roll axis angle?

Roll center height is 30 in and the roll axis angle is 0 degrees, noted as roll oversteer; at travel, roll center is 30.03 and roll axis is 0.21°.

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4-Link Suspension Calculator Screenshot - Link Geometry & Anti-Squat (Scout 800)

Suspension 4-bar linkage geometry diagram screenshot with plotted links and wheel circles

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

AI caption June 2011 · Photo 150 of 846

This document is a screenshot of a computer spreadsheet-based 4-link rear suspension calculator, apparently used to design or analyze link geometry for a custom suspension. It shows vehicle specification inputs — 112.0 in wheelbase, 42.00 in tire diameter, 19.75 in tire rolling radius, 43.00 in vehicle CG height, 6,000 lb vehicle mass, and 1,500 lb front and rear unsprung mass. Upper and lower link coordinates (x, y, z in inches) are given for both frame and axle ends: upper links frame end 34.00/12.00/33.00, axle end 0.00/2.00/30.50; lower links frame end 42.00/10.00/26.00, axle end 3.00/24.00/20.00. Calculated geometry results include 66% static anti-squat, 30 in roll center height, 0 degrees roll axis angle (roll oversteer), instant center at 136 in (X-axis) and 41 in (Z-axis). Travel results at 0.00 travel show 66% anti-squat, 30.03 roll center, 0.21° roll axis, and 0.00° pinion change. Graphical plots show plan and side views of the link geometry with anti-squat line, anti-squat CG line, 100% AS line, roll axis, roll center, and instant center overlays, plus a small travel chart. This appears to be one of several link-geometry design iterations in the owner's album, likely for a suspension build on their International Scout.

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Frequently asked questions

What is the static anti-squat percentage in this link setup?: The calculator shows 66% static anti-squat, and the travel anti-squat is also 66% at 0.00 travel.
What are the vehicle specs entered into the calculator?: Wheelbase 112.0 in, tire diameter 42.00 in, tire rolling radius 19.75 in, vehicle CG height 43.00 in, vehicle mass 6,000 lb, and front and rear unsprung masses of 1,500 lb each.
What are the upper link coordinates?: Upper links: frame end at x=34.00, y=12.00, z=33.00 in; axle end at x=0.00, y=2.00, z=30.50 in.
Where is the instant center located?: The instant center is at 136 in on the X-axis and 41 in on the Z-axis.
What is the roll center height and roll axis angle?: Roll center height is 30 in and the roll axis angle is 0 degrees, noted as roll oversteer; at travel, roll center is 30.03 and roll axis is 0.21°.