dutch roll

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Dutch roll

[‚dəch ′rōl]
(aerospace engineering)
A motion of an airplane which consists of simultaneous oscillations of the bank (or roll) angle, the slideslip angle, and the heading angle, and which, when poorly damped, is annoying to passengers and pilots.

dutch roll

An undesirable oscillatory instability of an aircraft characterized by a combined rolling and yawing movement. It is predominant in swept-wing aircraft and can be overcome by reducing lateral stability and use of yaw dampers. This tendency is predominant at lower speed ranges.
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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.
Pinckney, began to make "corrective action" to compete with the Dutch roll.
Arquiette cited there were "organizational training problems" on the training of Dutch roll recovery procedures as well as handling problems related to the Series Yaw Damper.
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.
The boat only made about five knots relative and was prone to Dutch roll.

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