Rocks & mirror
Encyclopedia of Marine and Energy Technology



A deep, vertical, finlike projection on the bottom of a vessel near the stern, installed to support the lower edge of the rudder, to support the propeller shaft for single screw ships, and to support the vessel in a dry dock.

The hull efficiency of the twin-skeg vessel is expected to be about 5% lower than for the singlescrew vessel owing to less favourable wake field.