The flat, foil-shaped underwater appendage of a small sailing vessel, typically referring to the active surface of a rudder, centerboard, or daggerboard. Blades provide lateral resistance to prevent the boat from slipping sideways and allow the helmsman to steer. Their shape and surface finish are critical for minimizing drag and maximizing lift in the water.
Heard on the job
Make sure the rudder blade is fully locked down before we head out into deeper water.