The cumulative effects of the malfunctioning [flight-control system], coupled with autopilot use and rudder movements during the unrecognized dutch roll
, generated dutch roll
forces that exceeded the mishap aircraft's design structural limits," the Air Force said in its investigation into the crash, released last month.
2009), especially in missions requiring Dutch roll mode specific maneuvers, decreasing their stability in these conditions.
The paper deals with increasing the damping factor of oscillations for these aircraft, during maneouvers involving the Dutch roll mode.
These expressions of the roots approximate well enough the eigenvalues of the Dutch roll and spiral modes.
Yaw control damping is based on determining the amplification factor Kr and the time constant of the Washout filter [tau], so that the Dutch roll mode damping factor of the closed circuit system, composed of the aircraft and the yaw damper, is of level 1 across the entire flight envelope, according to the MIL-F-8785C regulation.
The paper deals with a flight dynamics problem in aircraft with non-assisted controls, which have a low damping factor for maneouvers involving the Dutch roll mode.