skeg

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skeg

[skeg]
(naval architecture)
An extension of the stern end of the keel, which in some cases passes under the propeller and supports the rudder post.
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8(b) Protocol for the 31st America's Cup: "A yacht shall be deemed to be 'built' in a country if the hull of the yacht, including all training and all planking, plating or other form of surfacing of the hull, the deck and all appendages (including keel fins, bulbs, canards, rudders, skegs, trim tabs, wings etc) have been fabricated and assembled in that country.
Among the new barges' high-efficiency features are hydra-lift skegs that reduce towing resistance.