In a vehicle suspension, roll moment is the moment of inertia of the vehicle's sprung mass (the portion of its weight supported by the suspension). The roll moment is the product of the sprung mass and the square of the distance between the vehicle's roll center and its center of mass. If the vehicle is subjected to centrifugal forces, such as in a turn, the roll moment will cause the body to rotate (lean) towards the outside of the turn.
In aeronautics, the roll moment is the aerodynamic force applied at a distance from an aircraft's center of mass that causes the aircraft to undergo angular acceleration 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. A roll moment can be the result of wind gusts, control surfaces such as ailerons, or simply by flying at an angle of sideslip. See flight dynamics.
Famous quotes containing the words roll and/or moment:
“We have now traced the history of women from Paradise to the nineteenth century and have heard nothing through the long roll of the ages but the clank of their fetters.”
—Jane, Lady Wilde (1821–1896)
“I thus could not live, and I admitted it, unless on the entire earth, all creatures, or at least the greatest number, were turned toward me, eternally vacant, deprived of an independent life, ready at any moment to respond to my call, given to sterility until the day I deigned to grace them with my light. In short, for me to live happily, it was necessary for those chosen by me not to live at all.”
—Albert Camus (1913–1960)