Twin Skeg Design

A twin-skeg hull carries two longitudinal skegs aft, each housing a propeller shaft, so a wide shallow-draft vessel can run two propellers in well-aligned wake. Splitting thrust across two smaller propellers cuts the load per disc, which raises open-water efficiency, and CFD-optimized stern forms have reported resistance reductions around 9 percent on container and LNG hulls. The smaller propellers also improve cavitation and vibration behavior. The arrangement adds wetted surface and build cost, so it pays off mainly on beamy draft-limited ships where a single screw would be overloaded. It is an EEDI-reducing hull measure rather than a powertrain change.