The appendages under the hull are the rudder in the aft, the center keel, the bulb, and the winglets. The bulb, which may contain 20 tons or more of lead, is attached to the keel and provides the boat's balance. Winglets have been added to the bulb to reduce the lift induced drag.

(Image courtesy of CMCS (Chair of Modelling and Scientfic Compacting-EPFL -Lausanne))

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