A daggerboard is a retractable keel used by various sailing craft. In boats and ships keel can refer to either of two parts a structural element or a hydrodynamic element Sailing is the art of controlling a Sailing vessel. By changing the Rigging, Rudder and dagger or centre board a Sailor manages the force While other types of centreboard may pivot to retract, a daggerboard slides in a casing. centreboard is a retractable Keel which pivots out of a slot in the hull of a Sailboat, known as a centerboard trunk (US or case The shape of the daggerboard converts the forward motion into a windward lift, countering the leeward push of the sail. A sail is any type of surface intended to generate Thrust by being placed in a Wind &mdashin essence a vertically-oriented Wing.
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 is easily handled by a single person. A day sailer or dayboat is a small Sailboat without sleeping accommodations but which is larger than a Dinghy. Unlike centreboards, daggerboards are not usually ballasted, but are locked in place by a clip.
If a daggerboard is located off center, then it is called a leeboard or a bilgeboard. A leeboard is a lifting foil used by a sailboat much like a Centerboard, but located on the Leeward side of the boat A bilgeboard is a lifting foil used in a Sailboat, which resembles a cross between a Centerboard and a Leeboard.
The Mirror Dinghy, for example, uses a plywood daggerboard. The Mirror is a highly successful pram Dinghy, with more than 70000 built
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