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Marine Systems

List Control Rudder Roll Stabilization

List Control Systems for Ro-Ro cargo ships:

Control of List during the loading and unloading of cargo can be particularly acute for roll-on roll-off (RO-RO) ships. Cargo loading ramps, particularly ramps at the stern (or bow) of the vessel must provide for the twisting that occurs as the vessel's list increases. The Flume HEEL-AWAY ® List Control System maintains the ship at zero list by rapidly pumping ballast water between ballast tanks at the port and starboard of the ship. The electronic control system (ECU) designed by Schultz Engineering for Hyde Marine Systems, provides the list sensor and the control algorithms and circuitry necessary to monitor and control a high speed propeller pump and its associated hydraulic power source.

Two versions of this system have been deployed: (1) a system designed for and provided exclusively to the US Navy for the Sealift series of cargo ships. (2) a commercial version that has been provided to certain DFDS Tor Lines ships that are in regular service between European ports.