A daggerboard's a retractable keel used by various sailing craft. While other types of centreboard may pivot to retract, a daggerboard slides in a casing. The shape of the daggerboard converts the forward motion into a windward lift, countering the leeward push of the sail. Characteristics Daggerboards are often longer and thinner than pivoting centerboards, thus providing a better lift to drag ratio. Daggerboards are usually found in small craft such as day sailers, where their size's easily ha… (More on Daggerboard)