Abstract
Inaccuracy in prediction of manoeuvring and lack of robustness of closed-loop autopilot control have been a surprising experience for several ships with low metacentric height. Until now, effective investigations of these phenomena have been hindered by lack of knowledge on the precise interaction between roll and lateral motions. This was changed with the construction of a unique four-degrees-of-freedom roll planar motion mechanism (RPMM) at the Danish Maritime Institute.

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