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
And the Ship Sails On And the Ship Sails On And the Ship Sails On () is a 1983 Italian film by Federico Fellini. It depicts the events on board a luxury liner filled with the friends of a deceased opera singer who have gathered to mourn her. The film was selected as the Italian entry for the Best Foreign Language Film at the 56th Academy Awards, but was not accepted as a nominee. The film opens depicting a scene in July 1914 immediately prior to the cruise ship "Gloria N." setting sail from Naples Harbor. The opening sequence is in sepia tones, as if