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monohulls 
Sailboats with a single hull; they are easier to handle but not as fast as multihulls.
keel boat
Small monohull sailboat with a fixed and weighted skeg (keel) to keep the boat stable and prevent it from capsizing in the wind.
centerboard boat
Small monohull sailboat with a retractable centerboard; ballast is provided by the weight of the crew.
