Instead of traditional fins, the RotorSwing roll damping system uses rapidly rotating cylinders. Whilst the yacht is sailing, these cylinders generate an upward or downward force, depending on the direction of rotation. In order to dampen rolling, the rotors make a "swinging” motion from front to back under the ship in addition to rotating around their axis.
“To test the Zero Speed (ZS) capacity of the system with two rotors, we performed ‘forced roll’ motion on our 15 metre demonstration yacht Tessera. The results were amazing and far exceeded expectations. The angle readings on the inclinometer showed spectacular values", explained Theo Koop, owner of RotorSwing Marine.
RotorSwing Zero Speed can also be supplied with a 'rake' function whereby the rotors can be set at an angle of 45° while sailing. This enables planing vessels to benefit from an optimal roll reduction at speeds up to 18 knots. At higher speeds, the rotors are retracted back against the hull to minimise resistance. The ability to retract 'against' the hull is also particularly interesting for ice-classed vessels.