Bulb keel
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Fin and Bulb Keels. Downfall of Length and Sail Area Rule.
It was apparent in 1895 that if plate and bulb skimmingdishes could win all the prizes in the 20-rating and smaller classes, ...
A bulb keel has a large bulb at its bottom to place the ballast low.
Twin (bilge) keels come in a pair, with one short keel on either side of the boat's bottom.
Below the water, the Beneteau's bulb keel has a draft of 5 feet, 11 inches, although an optional 4-foot, 3-inch model is available. The spade rudder is constructed of stainless stock.
Racing yachts try to reduce the wetted surface area, which creates drag, by keeping the hull light whilst having a deep and heavy bulb keel, allowing them to support a tall mast with a great sail area.
There are several types of fixed keels including: full keels, fin keels, winged keels, bulb keels, and twin keels or bilge keels among other designs.
 See also: Keel, Ballast, Beam, Hull, Boat
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