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 Dawn Sails of Dawn Sails Of Dawn is an ocean racing yacht and cruising yacht, one of the last boats John Laurent Giles saw launched before his death in 1969. It was built to Lloyds 100A1 certification, while being also under Royal Ocean Racing Club certification and also to Lloyds 100A1 for the owner DD Morell of Mitchell Construction. Only three yards in Britain submitted tenders for the build, others stating the quality unattainable in the time-frame , and so it was down to two yards, McGruer of Clynder and Robertsons yard. McGruers were chosen for the price of 48,000 British