Definition
A 'bilge keel' is a long, narrow fin or pair of fins fitted to the hull of a boat, usually along the curve of the bilge. Their primary function is to reduce rolling motion, making the boat more stable, especially in rough seas. Think of them like training wheels for a boat, though they don't prevent capsizing entirely. They differ from a central keel, which is deeper and provides more stability and resistance to sideways movement. Bilge keels are often found on sailboats and motorboats. They provide a good balance between stability and maneuverability.