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Geometric roll center is solely dictated by the suspension geometry, and can be found using principles of the instant center of rotation.; Force based roll center, according to the US Society of Automotive Engineers, is "The point in the transverse vertical plane through any pair of wheel centers at which lateral forces may be applied to the sprung mass without producing suspension roll".
The three critical flight dynamics parameters are the angles of rotation in three dimensions about the vehicle's center of gravity (cg), known as pitch, roll and yaw. These are collectively known as aircraft attitude , often principally relative to the atmospheric frame in normal flight, but also relative to terrain during takeoff or landing ...
push the right wingtip up, the left down, a left roll-out owing to the dihedral angle, cause the left wing to go faster, the right wing slower, a roll-in, push the side areas of the aircraft above the centre of gravity to the left, a roll-out, push the side areas of the aircraft below the centre of gravity to the left, a roll-in,
Calculating this requires knowing the vehicle's sprung weight (total weight less the unsprung weight), the front and rear roll center heights, and the sprung center of gravity height (used to calculate the roll moment arm length). Calculating the front and rear sprung weight transfer will also require knowing the roll couple percentage.
Roll center height at design load; Mechanical (or caster) trail; Anti-dive and anti-squat; Kingpin Inclination; Scrub radius; Spring and shock absorber motion ratios; The kinematics describe how important characteristics change as the suspension moves, typically in roll or steer. They include Bump Steer; Roll Steer; Tractive Force Steer; Brake ...
Its instant center of rotation must be perpendicular to this vector (as V A is tangentially located on the circumference of a circle). The only line that fills the requirement is a line colinear with link P 1 -A. Somewhere on this line there is a point P, the instant center of rotation for the body BAC.
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In aeronautics, the roll moment is the product of an aerodynamic force and the distance between where it is applied and the aircraft's center of mass that tends to cause the aircraft to rotate about its roll axis. The roll axis is usually defined as the longitudinal axis, which runs from the nose to the tail of the aircraft.