Centerboarden

Centerboarden, commonly referred to as centerboards, are retractable keels used on certain sailboats to provide lateral resistance while allowing reduced draft. A centerboard is mounted along the boat’s centerline and can be lowered into or raised from a trunk or housing in the hull. Depending on the design, the board may pivot or slide vertically within the trunk and is typically secured in position with a pin, line, or locking mechanism.

When lowered, the centerboard increases sideways resistance, improving stability and upwind performance by reducing leeway. When raised, the board minimizes draft, enabling sailing in shallow water, beach landings, or easy towing and launching. The mechanism and construction must withstand hydrodynamic forces and the boat’s loads while remaining watertight and durable.

Centerboards are common on smaller sailboats, including dinghies and trailerable cruisers, as well as some multihulls. They contrast with fixed keels, which provide constant ballast and stability but restrict draft, and with daggerboards, which are separate boards that slide vertically in a dedicated trunk and may be lighter or more easily removed.

Advantages of centerboards include the ability to operate in shallow waters and to adapt draft to conditions. Drawbacks can include added complexity, potential water intrusion at the trunk, and structural loads on the hull. The choice among centerboard, daggerboard, or swing keel depends on boating needs, load considerations, and the intended use and operating environment.