leeboard

thumb|A Dutch sailing barge showing its stowed windward leeboard, hiked up with wind from starboard thumb|Leeboard deployed on a Thames sailing barge on the East Swin thumb|right|alt=Modern sharpie fitted with leeboards|The Centennial a 1979 Ted Brewer sharpie fitted with leeboards

A leeboard is a form of pivoting keel used largely by sailboats, very often in lieu of a fixed keel. Typically mounted in pairs on each side of a hull, leeboards function much like a centreboard, allowing shallow-draft craft to ply waters inaccessible to fixed-keel boats. Only the leeward side leeboard is used at any time, as it submerges when the boat heels under the force of the wind.