A winged keel is a sailboat keel, usually of high aspect ratio, that uses a nearly horizontal foil, the "wing", at the bottom to provide additional performance. The horizontal foil serves two purposes: it acts as an winglet on the foil, effectively doubling the aspect ratio, and it provides downwards lift to increase the stability of the boat. Winged keels are generally found on high performance offshore sailboats, if they are not prohibited by class rules. Black lingo for killing people, cause black people cant spell or pronounce words correctly ... The aspect ratio of a two-dimensional shape is the ratio of its longest dimension to its shortest dimension. ... A foil is a surface designed to maximize lift (force generated perpendicular to the fluid flow) while minimizing drag (force generated in the direction of the fluid flow) in a given range of conditions. ... A Laughing Gull on the beach in Atlantic City. ... A winglet is a device used to improve the efficiency of aircraft by lowering the lift-induced drag caused by wingtip vortices. ... The aspect ratio of a two-dimensional shape is the ratio of its longest dimension to its shortest dimension. ... Lift consists of the sum (technically the negative product) of all the fluid dynamic forces on a body normal (i. ... Offshore may refer to oil and natural gas production at sea, see oil platform. ...

The winged keel made its first appearance in the 1983 America's Cup Australian challenger Australia II, and is considered the decisive factor that allowed the Australian team to win the cup. The increased stability afforded by the winged keel allowed Australia II to be as short and light as possible under the 12 meter rules, and still carry enough sail to beat the American entry. The wings were angled downwards at about 20 degrees, which, since they were lifting downwards, acted as a dihedral. 1983 is a common year starting on Saturday of the Gregorian calendar. ... The Americas Cup is the most famous and most prestigious competition in the sport of yachting, and the oldest active trophy in international sports, predating the FA Cup by two decades and the Modern Olympics by 45 years. ... Australia II is a 12-Meter Class yacht, and the first successful challenger for the Americas Cup after 132 years. ... In geometry, the dihedral is the angle between two planes. ...

Most winged keels also incorporate a significant amount of ballast where the wings join the keel. This feature makes these winged keels also a type of bulb keel. Ballast is used in sailboats to provide moment to resist the lateral forces on the sail. ... A bulb keel is a keel, usually made with a high aspect ratio foil, that contains a ballast filled, usually teardrop shaped bulb at the bottom. ...