The AntiRoll uses dual-axis fins inspired by the fins of the blue whale. Underway the fins rotate; at anchor they switch to a flapping motion, giving strong roll reduction in both situations.
A hybrid drive powers the fins, which can retract or partly fold against the hull, making the system suitable for sailing yachts too. The patented design was developed with MARIN, TNO and TU Delft, and confirmed in model and drag tests.