What is the static anti-squat percentage of this 4-link setup?

The calculator shows 74% static anti-squat (and 74% travel anti-squat at 0.00 travel).

What are the link coordinates in this design?

Upper links: frame end x=56.00, y=13.00, z=22.00 in; axle end x=0.00, y=0.00, z=24.00 in. Lower links: frame end x=54.00, y=16.50, z=19.00 in; axle end x=4.00, y=25.00, z=15.00 in.

What roll center height and roll axis angle does the calculator show?

Roll center height is 24 in, and the roll axis angle is 1 degree, labeled as roll oversteer (1.05° at travel).

Where is the instant center located?

The instant center is at 81 in on the X-axis and 21 in on the Z-axis.

What vehicle parameters were entered into the calculator?

Wheelbase 110.0 in, tire diameter 37.00 in, tire rolling radius 16.50 in, vehicle CG height 34.00 in, vehicle mass 3,500 lb, front unsprung mass 1,000 lb, rear unsprung mass 750 lb.

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4-Link Suspension Calculator - 1987 Ford Ranger Link Geometry & Anti-Squat

4-Bar Linkage Calculator screenshot showing suspension link geometry plot and roll-center data

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Suspension 4-bar linkage calculator screenshot plotting link geometry, roll center and instant centers between front and rear tires.

AI caption February 2013 · Photo 154 of 157

This document is a screenshot of a spreadsheet-based 4-link rear suspension geometry calculator, apparently used to design or analyze a link suspension setup for a truck. Input parameters include a 110.0 in wheelbase, 37.00 in tire diameter, 16.50 in tire rolling radius, 34.00 in vehicle CG height, 3,500 lb vehicle mass, 1,000 lb front unsprung mass, and 750 lb rear unsprung mass. Upper and lower link frame-end and axle-end coordinates (x, y, z) are tabulated: upper links from frame end 56.00/13.00/22.00 in to axle end 0.00/0.00/24.00 in; lower links from frame end 54.00/16.50/19.00 in to axle end 4.00/25.00/15.00 in. Calculated outputs show 74% static anti-squat, 24 in roll center height, a 1-degree roll axis angle (labeled roll oversteer), and instant center location at 81 in (X-axis) and 21 in (Z-axis). Travel results at 0.00 travel show 74% anti-squat, 24.00 roll center, 1.05° roll axis, and 0.00° pinion change, with a 6.00 travel increment and Bump/Droop buttons. Two plots visualize the geometry in top and side views, with legend entries for lower links, upper links, anti-squat line, anti-squat CG, 100% AS line, roll axis, roll center, and instant center. A reader can learn the exact link geometry and resulting anti-squat and roll characteristics of this design.

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Frequently asked questions

What is the static anti-squat percentage of this 4-link setup?: The calculator shows 74% static anti-squat (and 74% travel anti-squat at 0.00 travel).
What are the link coordinates in this design?: Upper links: frame end x=56.00, y=13.00, z=22.00 in; axle end x=0.00, y=0.00, z=24.00 in. Lower links: frame end x=54.00, y=16.50, z=19.00 in; axle end x=4.00, y=25.00, z=15.00 in.
What roll center height and roll axis angle does the calculator show?: Roll center height is 24 in, and the roll axis angle is 1 degree, labeled as roll oversteer (1.05° at travel).
Where is the instant center located?: The instant center is at 81 in on the X-axis and 21 in on the Z-axis.
What vehicle parameters were entered into the calculator?: Wheelbase 110.0 in, tire diameter 37.00 in, tire rolling radius 16.50 in, vehicle CG height 34.00 in, vehicle mass 3,500 lb, front unsprung mass 1,000 lb, rear unsprung mass 750 lb.