Racing dinghies usually have a daggerboard or centreboard to better sail upwind. The design allows lateral resistance upwind, without the need for a skeg, daggerboard or centreboard. 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. It has a fractional sloop rig, a transom-hung rudder and a daggerboard keel. Its draft with the daggerboard and rudder raised is . Its draft with the daggerboard and rudder down is . Many small sailboats use a daggerboard instead of a fixed keel. A daggerboard fits into a trunk that runs through the hull of the rig. A daggerboard is similar but slides vertically rather than pivoting. If not well-made, the daggerboard will transfer vibrations from the trunk through the hull. The daggerboard puts a counter force from the wind pushing on the sails. The 2013 America's Cup featured daggerboard catamarans. The theoretical centre of lateral resistance is on the trailing edge of the daggerboard. The class winner sailed by Team New Zealand featured a distinct polyhedral daggerboard stabilizer.