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That doesn't look much like Dutch Roll to me! There should be significant yawing motion- I'm not sure of the prominence sideflow has on the tailfin, but on the VC10 during training, the yaw damper used to get switched off at high altitude, and a control waggle would kick the Dutch Roll off, which would grow into a divergent oscillation and be quite violent. One form of horror show was to view the tailplane through the periscope that used to go out through either side of the fuselage roof at the back to view the engines. It was a ghastly sight to see the whole fin and tailplane waggling from side to side during a Dutch Roll.
The technique for ending the Dutch roll (without being boring and putting the yaw damper back on) was to give a violent aileron input as the wings rolled level).
*A bonus point to anyone who remembers this self same periscope could go out through the bottom of the fuselage electronics bay to inspect the undercarriage!
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