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
Sails of the South Sails of the South The Trimast, commonly referred to as the Sails of the South, is a –high structure situated between two carriageways of the M275 motorway just outside Portsmouth, England. It was unveiled in March 2001 in order to enhance the entrance to the city as part of the regeneration scheme The Gateway Project. HGP Architects, offices located in Fareham less than realised the scheme and installation. The structure is one of the tallest in Portsmouth. The physical appearance of the Sails are a masted tri-sail, flanked by poles and cables on either side of the carriageway to form