centreboard

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centreboard

Nautical a supplementary keel for a sailing vessel, which may be adjusted by raising and lowering
References in periodicals archive ?
The sailboat that fit my budget back then was called an Atlanta--a yellow, 32-foot laminated plywood vessel that had twin centreboards that allowed you to bring them up and enter shallow water.
The super maxi has undergone significant hull surgery this year, which included the forward rudder being removed and replaced with twin retractable centreboards.
Wild Oats XI has had extensive hull surgery, with the forward rudder removed and replaced with twin retractable centreboards to improve both upwind and downwind speed.