What is the static anti-squat value for this 4-link setup?

The Geometry Summary shows a Static Anti-Squat of 76%, with Travel Anti-Squat also listed at 76%.

Where are the upper link mounting points located?

The upper links have a frame end at x=39.00, y=12.00, z=33.00 inches and an axle end at x=0.00, y=2.00, z=31.00 inches.

Where are the lower link mounting points located?

The lower links have a frame end at x=39.00, y=10.00, z=26.00 inches and an axle end at x=3.00, y=25.00, z=21.00 inches.

What vehicle specifications are used in this calculation?

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, front unsprung mass 800 lb, and rear unsprung mass 700 lb.

What are the roll center and roll axis results?

Roll Center Height is 30 in, the Roll Axis Angle is -1 degree (Roll Understeer), Travel Roll Center is 30.46, and Travel Roll Axis is -1.02°. Instant Center is at 119 in (X-axis) and 37 in (Z-axis).

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4-Bar Link Calculator V3.0 – Static Long-Arm Geometry, 76% Anti-Squat (Scout 800)

Suspension 4-bar linkage geometry diagram with plotted upper/lower links, roll axis, and wheels

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

AI caption June 2011 · Photo 144 of 846

This document is a screenshot of a spreadsheet-based "4 Bar Linkage Calculator V3.0" used to model rear suspension link geometry for a custom 4-link setup. The Vehicle Specifications table lists a 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, 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 39.00, 12.00, 33.00 in; axle end 0.00, 2.00, 31.00 in) and lower links (frame end 39.00, 10.00, 26.00 in; axle end 3.00, 25.00, 21.00 in). The Geometry Summary reports 76% static anti-squat, a 30 in roll center height, a -1 degree roll axis angle (roll understeer), and instant center coordinates of 119 in (X-axis) and 37 in (Z-axis). Travel results show 76% travel anti-squat, 30.46 travel roll center, -1.02° travel roll axis, 0.00° pinion change, 0.00 travel amount, and 1.00 travel increment. A large side-view plot depicts the links, tires, anti-squat lines, roll axis, roll center, and instant center per the legend, with a smaller inset chart tracking values through suspension travel. Readers can learn the link coordinates and resulting anti-squat/roll geometry for this configuration.

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Frequently asked questions

What is the static anti-squat value for this 4-link setup?: The Geometry Summary shows a Static Anti-Squat of 76%, with Travel Anti-Squat also listed at 76%.
Where are the upper link mounting points located?: The upper links have a frame end at x=39.00, y=12.00, z=33.00 inches and an axle end at x=0.00, y=2.00, z=31.00 inches.
Where are the lower link mounting points located?: The lower links have a frame end at x=39.00, y=10.00, z=26.00 inches and an axle end at x=3.00, y=25.00, z=21.00 inches.
What vehicle specifications are used in this calculation?: 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, front unsprung mass 800 lb, and rear unsprung mass 700 lb.
What are the roll center and roll axis results?: Roll Center Height is 30 in, the Roll Axis Angle is -1 degree (Roll Understeer), Travel Roll Center is 30.46, and Travel Roll Axis is -1.02°. Instant Center is at 119 in (X-axis) and 37 in (Z-axis).