I've only ever had Dutch roll when flying a Bolkow 105D on the North Sea. It came in on fairly short finals to an oil rig when the ias was low & was quite frightening on a black night until I got used to it with more experience. However when North Scottish bought 2 new 105D, probably less than 25 hours old, I never got Dutch roll. I ran this past the engineers & they reckoned the roll was caused by a slight wear in the linkages but still well within limits.
This roll is not the same as the Sikorski shudder in the older machines, so I'm told.
