Forces on sails to stay within the limitations of a craft's stability and power requirements, which are functions of hull (for boats) or chassis (for land craft) design. Sails derive power from wind that varies in time and with height above the surface. In order to do so, they are designed to adjust to the wind force for various points of sail. Both their design and method for control include means to match their lift and drag capabilities to the available apparent wind, by changing surface area, angle of attack, and curvature. Wind speed increases with height above the surface; at the same
Sixty Sails Handicap contested at various distances: In 1992, Illinois-breds accomplished a historic first when they finished 1-2-3 in the race. Speed record: In 1980 and 1981 the Sixty Sails Handicap was run in two divisions. Sixty Sails Handicap The Sixty Sails Handicap is an American Thoroughbred horse race held annually during the third week of April at Hawthorne Race Course in Stickney/Cicero, Illinois. A Grade III event open to Fillies and Mares, age three and older, it is contested on dirt at a distance of one mile and one eighth (9 furlongs). Inaugurated in 1976 at Sportsman's Park, in 2004, the race