Daggerboard
![Catamarans are steady because of the multihull with daggerboards](/Images/godic/202501/07/Steady_at_sea4716.JPG")
![Keel is vertically removable](/Images/godic/202501/07/Parts_of_the_rig4716.JPG")
A daggerboard is a retractable centreboard 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. The theoretical centre of lateral resistance is on the trailing edge of the daggerboard.