Centerboards

Centerboard is a type of retractable keel used on many small sailing vessels. It is mounted along the boat’s centerline and can be lowered to provide lateral resistance for sailing upwind and raised to reduce draft for shallow water, beaching, or trailer access. By adjusting the board’s depth, a vessel can trade draft for improved maneuverability and upwind performance.

Centerboards come in several configurations. The most common are pivoting (swing) centerboards, hinged at the leading edge so the board can rotate downward; and lifting centerboards that slide vertically within a fixed trunk or casing in the hull. Some designs use a combination of a centerboard with a ballast-weighted section. The board is located near the centerline to minimize adverse weather helm and maintain balance.

Operation and performance: Lowering increases lateral resistance and reduces leeway, improving ability to sail to windward; raising reduces draft and drag when sailing in shallow water or when access to shore is needed. However, centerboards add mechanical complexity, potential leakage at the trunk, and maintenance needs for hinges, slides, and lines. The board’s weight and position affect stability and hull trim, particularly in varying wind and sea conditions.

Materials and usage: Centerboards are commonly made from wood, fiberglass, aluminum, or steel, often with protective coatings. They are widely used on dinghies, daysailers, and small cruising boats, where shallow draft and beachability are valued. Proper care includes maintaining seals and wear surfaces and ensuring smooth operation of the lifting mechanism.