Static Rollover is a rolling action when the helicopter blades are not in rotation. When the rotor blades stop, the helicopter has the same principles of any other object and will roll if the static rollover critical angle is exceeded. Each helicopter has its own critical angle; this is a byproduct of its
center-of-gravity. A rolling object has a pivot point and an imaginary line extending upward from the pivot point; as the object rolls around the pivot point, the center of gravity moves closer to the pivot line. Only upon passing the pivot line will the object roll to the corresponding adjacent side of the base. The static rollover critical angle can be determined by measuring the angle between level ground and an imaginary line drawn from skid to skid, when the helicopter's center of gravity is located on the upward pivot line. Static rollover also pertains to
automobiles. In the study of roll stability of vehicles, the static rollover threshold is a key measure. It is expressed as a lateral acceleration in gravitational units. In reality, rollovers are dynamic events; however, there is a strong relationship between roll stability and occurrences of rollover in accidents. == References ==